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Saturday, May 4, 2019

Elon Musk

From Wikipedia, the free encyclopedia

Elon Musk

Musk at the Royal Society admissions day in London, July 2018
Musk at the Royal Society admissions day in London, July 2018
Born
Elon Reeve Musk

June 28, 1971 (age 47)
Pretoria, Transvaal, South Africa
ResidenceBel Air, Los Angeles, California, United States
Citizenship
  • South Africa (1971–present)
  • Canada (1989–present)
  • United States (2002–present)
Alma mater
Occupation
  • Entrepreneur
  • investor
  • engineer
Years active1995–present
Net worthUS$19.8 Billion (April 2019)
Title
Political partyIndependent
Spouse(s)
Partner(s)
Children6 (1 deceased)
Parent(s)
Relatives
AwardsFellow of the Royal Society
Signature
Elon Musk

Elon Reeve Musk FRS (/ˈlɒn/; born June 28, 1971) is a technology entrepreneur, investor, and engineer. He holds South African, Canadian, and U.S. citizenship and is the founder, CEO, and lead designer of SpaceX; co-founder, CEO, and product architect of Tesla, Inc.; co-founder and CEO of Neuralink; founder of The Boring Company; co-founder and co-chairman of OpenAI; and co-founder of PayPal. In December 2016, he was ranked 21st on the Forbes list of The World's Most Powerful People. As of April 2019, he has a net worth of $22.3 billion and is listed by Forbes as the 40th-richest person in the world.

Born and raised in Pretoria, South Africa, Musk moved to Canada when he was 17 to attend Queen's University. He transferred to the University of Pennsylvania two years later, where he received an economics degree from the Wharton School and a degree in physics from the College of Arts and Sciences. He began a Ph.D. in applied physics and material sciences at Stanford University in 1995 but dropped out after two days to pursue an entrepreneurial career. He subsequently co-founded Zip2, a web software company, which was acquired by Compaq for $340 million in 1999. Musk then founded X.com, an online bank. It merged with Confinity in 2000 and later that year became PayPal, which was bought by eBay for $1.5 billion in October 2002.

In May 2002, Musk founded SpaceX, an aerospace manufacturer and space transport services company, of which he is CEO and lead designer. He helped fund Tesla, Inc., an electric vehicle and solar panel manufacturer, in 2003, and became its CEO and product architect. In 2006, he inspired the creation of SolarCity, a solar energy services company that is now a subsidiary of Tesla, and operates as its chairman. In 2015, Musk co-founded OpenAI, a nonprofit research company that aims to promote friendly artificial intelligence. In July 2016, he co-founded Neuralink, a neurotechnology company focused on developing brain–computer interfaces. In December 2016, Musk founded The Boring Company, an infrastructure and tunnel-construction company.

In addition to his primary business pursuits, Musk has envisioned a high-speed transportation system known as the Hyperloop, and has proposed a vertical take-off and landing supersonic jet electric aircraft with electric fan propulsion, known as the Musk electric jet. Musk has stated that the goals of SpaceX, Tesla, and SolarCity revolve around his vision to change the world and humanity. His goals include reducing global warming through sustainable energy production and consumption, and reducing the risk of human extinction by establishing a human colony on Mars.

Early life

Musk was born on June 28, 1971, in Pretoria, Transvaal, South Africa, the son of Maye Musk (née Haldeman), a model and dietitian from Regina, Saskatchewan, Canada, and Errol Musk, a South African electromechanical engineer, pilot, and sailor. He has a younger brother, Kimbal (born 1972), and a younger sister, Tosca (born 1974). His maternal grandfather, Dr. Joshua Haldeman, was an American-born Canadian. His paternal grandmother was British, and he also has Pennsylvania Dutch ancestry. After his parents divorced in 1980, Musk lived mostly with his father in the suburbs of Pretoria, which Musk chose two years after his parents split up, but now Musk says it was a mistake. As an adult, Musk has severed relations with his father, whom he has referred to as "a terrible human being". He has a half-sister and a half-brother.

During his childhood, Musk was an avid reader. At the age of 10, he developed an interest in computing with the Commodore VIC-20. He taught himself computer programming at the age of 10, and by the age of 12 sold the code of a BASIC-based video game he created called Blastar, to a magazine called PC and Office Technology, for approximately $500. A web version of the game is available online. His childhood reading included Isaac Asimov's Foundation series, from which he drew the lesson that "you should try to take the set of actions that are likely to prolong civilization, minimize the probability of a dark age and reduce the length of a dark age if there is one."

Musk was severely bullied throughout his childhood and was once hospitalized when a group of boys threw him down a flight of stairs and then smashed his head into the pavement until he lost consciousness. He later revealed that he had to get a nose job, to repair the damage.

Musk attended Waterkloof House Preparatory School and Bryanston High School before graduating from Pretoria Boys High School. Although Musk's father insisted that Elon go to college in Pretoria, Musk became determined to move to the United States. As he states, "I remember thinking and seeing that America is where great things are possible, more than any other country in the world." Knowing it would be easy to get to the United States from Canada, he moved to Canada against his father's wishes in June 1989, just before his 18th birthday, after obtaining a Canadian passport through his Canadian-born mother.

Education

At the age of 17, in 1989, Elon Musk moved to Canada to attend Queen's University, avoiding mandatory service in the South African military. He left in 1992 to study business and physics at the University of Pennsylvania, and graduated with an undergraduate degree in economics and stayed for a second bachelor's degree in physics.

After leaving Penn, Elon Musk headed to Stanford University in California to pursue a PhD in energy physics. However, his move coincided with the Internet boom, and he dropped out of Stanford after just two days to become a part of it, launching his first company, Zip2 Corporation.

Career

Zip2

In 1995, Musk and his brother, Kimbal, started Zip2, a web software company, with money raised from a small group of angel investors. The company developed and marketed an Internet city guide for the newspaper publishing industry. Musk obtained contracts with The New York Times and the Chicago Tribune and persuaded the board of directors to abandon plans for a merger with CitySearch. While at Zip2, Musk wanted to become CEO; however, none of the board members would allow it. Compaq acquired Zip2 for US$307 million in cash and US$34 million in stock options in February 1999. Musk received US$22 million for his 7 percent share from the sale.

X.com and PayPal

In March 1999, Musk co-founded X.com, an online financial services and e-mail payment company, with US$10 million from the sale of Zip2. One year later, the company merged with Confinity, which had a money-transfer service called PayPal. The merged company focused on the PayPal service and was renamed PayPal in 2001. PayPal's early growth was driven mainly by a viral marketing campaign where new customers were recruited when they received money through the service. Musk was ousted in October 2000 from his role as CEO (although he remained on the board) due to disagreements with other company leadership, notably over his desire to move PayPal's Unix-based infrastructure to Microsoft Windows. In October 2002, PayPal was acquired by eBay for US$1.5 billion in stock, of which Musk received US$165 million. Before its sale, Musk, who was the company's largest shareholder, owned 11.7% of PayPal's shares.

In July 2017, Musk purchased the domain x.com from PayPal for an undisclosed amount, stating that it has sentimental value to him.

SpaceX

In 2001, Musk conceptualized Mars Oasis, a project to land a miniature experimental greenhouse on Mars, containing food crops growing on Martian regolith, in an attempt to regain public interest in space exploration. In October 2001, Musk travelled to Moscow with Jim Cantrell (an aerospace supplies fixer), and Adeo Ressi (his best friend from college), to buy refurbished Dnepr Intercontinental ballistic missiles (ICBMs) that could send the envisioned payloads into space. The group met with companies such as NPO Lavochkin and Kosmotras; however, according to Cantrell, Musk was seen as a novice and was consequently spat on by one of the Russian chief designers, and the group returned to the United States empty-handed. In February 2002, the group returned to Russia to look for three ICBMs, bringing along Mike Griffin. Griffin had worked for the CIA's venture capital arm, In-Q-Tel, as well as NASA's Jet Propulsion Laboratory, and was just leaving Orbital Sciences, a maker of satellites and spacecraft. The group met again with Kosmotras, and were offered one rocket for US$8 million; however, this was seen by Musk as too expensive; Musk consequently stormed out of the meeting. On the flight back from Moscow, Musk realized that he could start a company that could build the affordable rockets he needed. According to early Tesla and SpaceX investor Steve Jurvetson, Musk calculated that the raw materials for building a rocket actually were only 3 percent of the sales price of a rocket at the time. It was concluded that theoretically, by applying vertical integration and the modular approach from software engineering, SpaceX could cut launch price by a factor of ten and still enjoy a 70-percent gross margin. Ultimately, Musk ended up founding SpaceX with the long-term goal of creating a true spacefaring civilization.

Musk and President Barack Obama at the Falcon 9 launch site in 2010
 
With US$100 million of his early fortune, Musk founded Space Exploration Technologies, or SpaceX, in May 2002. Musk is chief executive officer (CEO) and chief technology officer (CTO) of the Hawthorne, California-based company. SpaceX develops and manufactures space launch vehicles with a focus on advancing the state of rocket technology. The company's first two launch vehicles are the Falcon 1 and Falcon 9 rockets (a nod to Star Wars' Millennium Falcon), and its first spacecraft is the Dragon (a nod to Puff the Magic Dragon). In seven years, SpaceX designed the family of Falcon launch vehicles and the Dragon multipurpose spacecraft. In September 2008, SpaceX's Falcon 1 rocket became the first privately funded liquid-fueled vehicle to put a satellite into Earth orbit. On May 25, 2012, the SpaceX Dragon vehicle berthed with the ISS, making history as the first commercial company to launch and berth a vehicle to the International Space Station.

NASA Administrator Charles Bolden congratulates Musk in front of the Dragon capsule in 2012
 
In 2006, SpaceX was awarded a contract from NASA to continue the development and test of the SpaceX Falcon 9 launch vehicle and Dragon spacecraft in order to transport cargo to the International Space Station, followed by a US$1.6 billion NASA Commercial Resupply Services program contract on December 23, 2008, for 12 flights of its Falcon 9 rocket and Dragon spacecraft to the Space Station, replacing the US Space Shuttle after it retired in 2011. Astronaut transport to the ISS is currently handled solely by the Soyuz, but SpaceX is one of two companies awarded a contract by NASA as part of the Commercial Crew Development program, which is intended to develop a US astronaut transport capability by 2018.

Musk believed that the key to making space travel affordable is to make rockets reusable, Though most experts in the space industry did not believe that reusable rockets were possible or feasible. On December 22, 2015, SpaceX successfully landed the first stage of its Falcon rocket back at the launch pad. This was the first time in history such a feat had been achieved by an orbital rocket and is a significant step towards rocket reusability lowering the costs of access to space. This first stage recovery was replicated several times in 2016 by landing on an autonomous spaceport drone ship, an ocean-based recovery platform, and by the end of 2017, SpaceX had landed and recovered the first stage on 16 missions in a row where a landing and recovery were attempted, including all 14 attempts in 2017. 20 out of 42 first stage Falcon 9 boosters have been recovered overall since the Falcon 9 maiden flight in 2010. In the most recent full year—2017—SpaceX launched 18 successful Falcon 9 flights, more than doubling their highest previous year of 8.

On February 6, 2018, SpaceX successfully launched the Falcon Heavy, the fourth-highest capacity rocket ever built (after Saturn V, Energia and N1) and the most powerful rocket in operation as of 2018. The inaugural mission carried a Tesla Roadster belonging to Musk as a dummy payload.

SpaceX is both the largest private producer of rocket engines in the world and holder of the record for the highest thrust-to-weight ratio for a rocket engine (the Merlin 1D). SpaceX has produced more than 100 operational Merlin 1D engines. Each Merlin 1D engine can vertically lift the weight of 40 average family cars. In combination, the 9 Merlin engines in the Falcon 9 first stage produce anywhere from 5.8 to 6.7 MN (1.3 to 1.5 million pounds) of thrust, depending on altitude.

Musk was influenced by Isaac Asimov's Foundation series and views space exploration as an important step in preserving and expanding the consciousness of human life. Musk said that multiplanetary life may serve as a hedge against threats to the survival of the human species.
An asteroid or a super volcano could destroy us, and we face risks the dinosaurs never saw: an engineered virus, inadvertent creation of a micro black hole, catastrophic global warming or some as-yet-unknown technology could spell the end of us. Humankind evolved over millions of years, but in the last sixty years atomic weaponry created the potential to extinguish ourselves. Sooner or later, we must expand life beyond this green and blue ball—or go extinct.
Musk's goal is to reduce the cost of human spaceflight by a factor of 10. In a 2011 interview, he said he hopes to send humans to Mars' surface within 10–20 years. In Ashlee Vance's biography, Musk stated that he wants to establish a Mars colony by 2040, with a population of 80,000. Musk stated that, since Mars' atmosphere lacks oxygen, all transportation would have to be electric (electric cars, electric trains, Hyperloop, electric aircraft). Musk stated in June 2016 that the first unmanned flight of the larger Mars Colonial Transporter (MCT) spacecraft is aimed for departure to the red planet in 2022, to be followed by the first manned MCT Mars flight departing in 2024. In September 2016, Musk revealed details of his architecture to explore and colonize Mars. By 2016, Musk's private trust holds 54% of SpaceX stock, equivalent to 78% of voting shares.

In late 2017, SpaceX unveiled the design for its next-generation launch vehicle and spacecraft system—BFR—that would support all SpaceX launch service provider capabilities with a single set of very large vehicles: Earth-orbit, Lunar-orbit, interplanetary missions, and even intercontinental passenger transport on Earth, and totally replace the Falcon 9, Falcon Heavy and Dragon vehicles in the 2020s. The BFR will have a 9-meter (30 ft) core diameter. Significant development on the vehicles began in 2017, while the new rocket engine development began in 2012.

Tesla

Tesla, Inc. (originally Tesla Motors) was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning, who financed the company until the Series A round of funding.

Both men played active roles in the company's early development prior to Elon Musk's involvement. Musk led the Series A round of investment in February 2004, joining Tesla's board of directors as its chairman. Musk took an active role within the company and oversaw Roadster product design at a detailed level, but was not deeply involved in day-to-day business operations.

Following the financial crisis in 2008 and after a series of escalating conflicts in 2007, Eberhard was ousted from the firm. Musk assumed leadership of the company as CEO and product architect, positions he still holds today. Tesla Motors first built an electric sports car, the Tesla Roadster in 2008, with sales of about 2,500 vehicles to 31 countries. Tesla began delivery of its four-door Model S sedan on June 22, 2012. It unveiled its third product, the Model X, aimed at the SUV/minivan market, on February 9, 2012; however, the Model X launch was delayed until September 2015. In addition to its own cars, Tesla sells electric powertrain systems to Daimler for the Smart EV, Mercedes B-Class Electric Drive and Mercedes A Class, and to Toyota for the RAV4 EV. Musk was able to bring in both companies as long-term investors in Tesla.
Musk has favored building a sub-US$30,000 compact Tesla model and building and selling electric vehicle powertrain components so that other automakers can produce electric vehicles at affordable prices without having to develop the products in-house; this led to the Model 3 that is planned to have a base price of US$35,000. Several mainstream publications have compared him with Henry Ford for his work on advanced vehicle powertrains.

In a May 2013 interview with All Things Digital, Musk said that to overcome the range limitations of electric cars, Tesla is expanding its network of supercharger stations, tripling the number on the East and West coasts of the U.S. that June, with plans for more expansion across North America, including Canada, throughout the year. As of January 29, 2016, Musk owns about 28.9 million Tesla shares, which equates to about 22% of the company.

As of 2014, Musk's annual salary is one dollar, similar to that of Steve Jobs and other CEOs; the remainder of his compensation is in the form of stock and performance-based bonuses.

In 2014, Musk announced that Tesla would allow its technology patents to be used by anyone in good faith in a bid to entice automobile manufacturers to speed up development of electric cars. "The unfortunate reality is electric car programs (or programs for any vehicle that doesn't burn hydrocarbons) at the major manufacturers are small to non-existent, constituting an average of far less than 1% of their total vehicle sales," Musk said.

In February 2016, Musk announced that he had acquired the Tesla.com domain name from Stu Grossman, who had owned it since 1992, and changed Tesla's homepage to that domain.

In January 2018, Musk was granted an option to buy up to 20.3 million shares if Tesla's market value were to rise to $650 billion. Majority shareholder approval was pending As of 5 March 2018. The grant was also meant to end speculation about Musk's potential departure from Tesla to devote more time to his other business ventures. A report by advisory firm Glass Lewis & Co. to its clients argued against granting the options.

The New York Post described the pending stock option grant as an "astronomical deal" in pay when it reported that Tesla accepted $750 million in public funds from New York Governor Andrew Cuomo as part of the Buffalo Billion project, a plan to invest money to help the economy of the Buffalo, New York area. The money was used to build a factory and infrastructure for solar panel maker SolarCity, which Tesla acquired. As of March 2018, the plant employed "just a few hundred workers and its future remains uncertain." (The Buffalo area actually lost nearly 5,000 jobs between December 2016 and December 2017).

Musk with Indian Prime Minister Narendra Modi in San Jose, California on September 26, 2015
 
In September 2018, Musk was charged by the U.S. Securities and Exchange Commission for a tweet claiming that funding had been secured for taking Tesla private. The lawsuit characterized the tweet as false, misleading, and damaging to investors, and sought to bar Musk from serving as CEO on publicly traded companies. Two days later, Musk reached a settlement with the SEC. As a result, Musk and Tesla were fined $20 million each, and Musk was forced to step down as Tesla chairman within 45 days while remaining Tesla's CEO. Musk also proclaimed in several interviews since that he does not regret sending the tweet that triggered the SEC investigation. According to Reuters, Musk said the tweet that cost him and the company $20 million in fines was "Worth It". Musk also went on to tweet on October 1, 2018 a link to "O.P.P." by Naughty by Nature as a take on what had happened between him and the SEC. 

According to ABC News, "As recently as Oct. 4 2018, Musk issued a sarcastic tweet, describing the agency [SEC] as the “Shortseller Enrichment Commission,” despite having agreed to settlement terms a week earlier that his company, Tesla, would monitor his tweets and other communications."

In a December 2018 interview with CBS’s “60 Minutes”, Musk mentioned that since reaching an agreement with SEC, none of his tweets have been censored. He further mentioned that he has no respect for the SEC by saying, "I want to be clear. I do not respect the SEC."

Following Musk's resignation as chairman, Tesla named Robyn Denholm to replace Elon Musk as the acting chairman. This decision came after weeks of speculation on whether Tesla would nominate James Murdoch.

In January 2019, Musk traveled to China for the groundbreaking of Tesla's Shanghai Gigafactory, which is the company's first large-scale plant outside the U.S. Part of his visit to China, Musk also met the Chinese premier Li Keqiang. During their exchange, Musk confessed his love for China and wished he could visit China more often, to which the Chinese premier was quoted as saying "We can issue you a Chinese green card if that helps."

On 19th February 2019, according to Forbes, Musk stated in a tweet that Tesla would build half a million cars in 2019. Dane Butswinkas, who arrived on 17th December to serve as Tesla’s General Counsel reporting to Musk and likely reviewing his tweets after the settlement agreement was reached, resigned on 21st February.

The SEC reacted to Musk’s tweet by filing in court, holding him in contempt for violating the terms of settlement agreement with such a tweet. On 26th February 2019, as mentioned in Bloomberg, Musk sarcastically addressed SEC in another tweet saying, “SEC forgot to read Tesla earnings transcript, which clearly states 350k to 500k. How embarrassing…”

SolarCity

Musk provided the initial concept and financial capital for SolarCity, which was then co-founded in 2006 by his cousins Lyndon and Peter Rive. By 2013, SolarCity was the second largest provider of solar power systems in the United States. SolarCity was acquired by Tesla, Inc. in 2016 and is currently a wholly owned subsidiary of Tesla.

The underlying motivation for funding both SolarCity and Tesla was to help combat global warming. In 2012, Musk announced that SolarCity and Tesla are collaborating to use electric vehicle batteries to smooth the impact of rooftop solar on the power grid, with the program going live in 2013.

Gigafactory

On June 17, 2014, Musk committed to building a SolarCity advanced production facility in Buffalo, New York, that would triple the size of the largest solar plant in the United States. Musk stated the plant will be "one of the single largest solar panel production plants in the world," and it will be followed by one or more even bigger facilities in subsequent years. The Tesla Gigafactory 2 is a photovoltaic (PV) cell factory, leased by Tesla subsidiary SolarCity in Buffalo, New York. Construction on the factory started in 2014 and was completed in 2017.

Hyperloop

On August 12, 2013, Musk unveiled a concept for a high-speed transportation system incorporating reduced-pressure tubes in which pressurized capsules ride on an air cushion driven by linear induction motors and air compressors. The mechanism for releasing the concept was an alpha-design document that, in addition to scoping out the technology, outlined a notional route where such a transport system might be built: between the Greater Los Angeles Area and the San Francisco Bay Area.

After earlier envisioning Hyperloop, Musk assigned a dozen engineers from Tesla and SpaceX who worked for nine months, establishing the conceptual foundations and creating the designs for the transportation system. An early design for the system was then published in a whitepaper posted to the Tesla and SpaceX blogs. Musk's proposal, if technologically feasible at the costs he has cited, would make Hyperloop travel cheaper than any other mode of transport for such long distances. The alpha design was proposed to use a partial vacuum to reduce aerodynamic drag, which it is theorized would allow for high-speed travel with relatively low power, with certain other features like air-bearing skis and an inlet compressor to reduce freestream flow. The document of alpha design estimated the total cost of an LA-to-SF Hyperloop system at US$6 billion, but this amount is speculative.

In June 2015, Musk announced a design competition for students and others to build Hyperloop pods to operate on a SpaceX-sponsored mile-long track in a 2015–2017 Hyperloop pod competition. The track was used in January 2017, and Musk also started building a tunnel.

Hyperloop One, a company unaffiliated with Musk, had announced that it had done its first successful test run on its DevLoop track in Nevada on July 13, 2017. It was on May 12, 2017, at 12:02 a.m. and had lasted 5.3 seconds, reaching a top speed of 70 mph.

On July 20, 2017, Elon Musk announced that he had received verbal government approval to build a hyperloop from New York City to Washington, D.C., stopping in both Philadelphia and Baltimore. However, the New York City Transit Authority, Southeastern Pennsylvania Transportation Authority, Washington Metropolitan Area Transit Authority, Maryland Transit Administration, United States Department of Homeland Security, as well as the mayors of New York, Philadelphia, Baltimore, and Washington D.C. stated that they are unaware of any such agreement.

OpenAI

In December 2015, Musk announced the creation of OpenAI, a not-for-profit artificial intelligence (AI) research company. OpenAI aims to develop artificial general intelligence in a way that is safe and beneficial to humanity.

By making AI available to everyone, OpenAI wants to "counteract large corporations who may gain too much power by owning super-intelligence systems devoted to profits, as well as governments which may use AI to gain power and even oppress their citizenry." Musk has stated he wants to counteract the concentration of power. In 2018 Musk left the OpenAI board to avoid possible future conflicts with his role as CEO of Tesla as Tesla increasingly becomes involved in AI.

However, in an interview with Joe Rogan in September 2018, Musk warned about the dangers of developing artificial intelligence indiscriminately. In January 2019 Mark Harris of The Guardian noted that on 23 January the Musk foundation "added a line to its website, stating its support for the “development of safe artificial intelligence to benefit humanity”".

Neuralink

In 2016, Musk co-founded Neuralink, a neurotechnology startup company to integrate the human brain with artificial intelligence. The company is centered on creating devices that can be implanted in the human brain, with the eventual purpose of helping human beings merge with software and keep pace with advancements in artificial intelligence. These enhancements could improve memory or allow more direct interfacing with computing devices. Musk sees Neuralink and OpenAI as related: "OpenAI is a nonprofit dedicated to minimizing the dangers of artificial intelligence, while Neuralink is working on ways to implant technology into our brains to create mind-computer interfaces."

The Boring Company

Musk discussing The Boring Company at TED 2017
 
On December 17, 2016, while stuck in traffic, Musk tweeted "Am going to build a tunnel boring machine and just start digging ..." The company was named 'The Boring Company'. On January 21, 2017, Musk tweeted "Exciting progress on the tunnel front. Plan to start digging in a month or so." The first tunnel will start on the SpaceX campus, The Boring Test Tunnel runs underneath West 120th Street. As of January 26, 2017, discussions with regulatory bodies had begun.

In February 2017, the company began digging a 30-foot-wide, 50-foot-long, and 15-foot-deep "test trench" on the premises of Space X's offices in Los Angeles, since the construction requires no permits. Musk had said in early 2017 that a 10-fold decrease in tunnel boring cost per mile is necessary for economic feasibility of the proposed tunnel network. By late 2018, TBC had active construction, approved plans in place, or an operational tunnel in several areas of the United States: Baltimore, Chicago, and Los Angeles. TBC provided an update on the state of their technology and product line when they opened to the public their first mile-long test tunnel in Hawthorne, California, on 18 December 2018, stating that it has been a proof-of-concept for the technology. Design is complete for the third-generation Boring TBM, Prufrock, slated to support a 15x improvement in tunneling speed over the existing state of the art, and the machine will be assembled and begin engineering testing in 2019.

pravduh.com

After a string of negative press targeting Tesla caused Musk to become frustrated, specifically articles published by Reveal News criticizing Tesla for its factory safety procedures, Musk announced on Twitter that he is planning on creating a website where users could rate the truthfulness of specific articles in addition to the credibility of journalists and publications. He suggested calling it "Pravda" after a Soviet Union-era Communist Party newspaper of the same name.

This caused backlash from many journalists, claiming that a platform where any user could freely vote on an article's or a journalist's credibility could be prone to abuse.

After realizing the site "pravda.com" is used by the Ukrainian Internet newspaper Ukrayinska Pravda, Musk bought the site pravduh.com on May 25, 2018.

Tham Luang cave rescue

In July 2018, Musk attempted to provide assistance to rescuers during the Tham Luang cave rescue by ordering his employees to build a small rescue pod

Musk, responding to requests for help from Twitter users, contacted James Yenbamroong, CEO of Thailand-based satellite company Mu Space, to get him connected with the Thai government. He then ordered engineers from two of his companies to design a child-sized submarine to help the rescue effort and publicised the process via Twitter. Engineers at Musk's companies SpaceX and The Boring Company built the mini-submarine out of a Falcon 9 liquid oxygen transfer tube and personally delivered it to Thailand. 

Named "Wild Boar" after the children's soccer team, its design, a five-foot (1.5 m)-long, twelve-inch (300 mm)-inch wide sealed tube weighing about 90 pounds (41 kg) propelled manually by divers in the front and back, was intended to solve the problem of safely transporting the children, who might have had difficulty learning the scuba skills required to exit the cave on their own without panicking. In case the mini-submarine could not fit through the cave system, Elon Musk also requested Wing Inflatables, a California-based inflatable boat manufacturer, to build inflatable escape pods. The pods were designed, fabricated, and tested in one day before being flown to Thailand.

By this time, eight of the twelve children had already been rescued and Thai authorities decided not to use the submarine, describing it as technologically impressive but impractical.

Device viability

The supervisor of the rescue operation Narongsak Osatanakorn dismissed the submarine as impractical under the current circumstances. A rescue caver who had been exploring the cave for the past six years and who had originally located the trapped football team, said that Musk's idea "had absolutely no chance of working ... the submarine, I believe, was about five foot six long, rigid, so it wouldn't have gone round corners or round any obstacles. It wouldn't have made the first 50 metres into the cave from the dive start point." Musk tweeted that Richard Stanton, leader of the international diving team, had earlier urged Musk to continue construction of the mini-submarine as a back-up, in case the flooding worsened.

Although the device could safely hold an occupant, there were concerns that its rigid body was only slightly smaller than the narrowest passages in the cave, making it risky to get it through the tighter turns.

Media coverage and Musk's behavior

As media coverage of the event grew, some were skeptical of Musk's intentions, claiming the submarine was mainly built for publicity for Tesla and Musk, citing the apparent uselessness of the device.

One of the divers said to have played a major role in the rescue criticized the submarine as amounting to nothing more than a public relations effort with no chance of success, and that Musk "had no conception of what the cave passage was like"; and said that Musk "can stick his submarine where it hurts". Musk reasserted on Twitter that the device would have worked and referred to the diver as "pedo guy" without offering any evidence to support the claim, causing backlash against Musk. He subsequently deleted the tweets, along with an earlier tweet in which he told another critic of the device "Stay tuned jackass". On 16 July, the diver stated that he was considering legal action in relation to Musk's comments.

After Musk's Tweets, Tesla shares fell 4% as some investors worried about his erratic behavior. Tesla investors subsequently demanded that Musk apologize. Two days later, Musk issued an apology for his remarks: "The fault is mine and mine alone" and "my words were spoken in anger".

On August 28, 2018, in response to criticism from a writer on Twitter regarding how Musk had handled the diver's criticism, Musk circled back to the pedophilia accusation tweeting "You don't think it's strange he hasn't sued me? He was offered free legal services. ...". The following day, a letter from L. Lin Wood, the rescuer's attorney, dated August 6, emerged, showing that he had been making preparations for a libel lawsuit.

On 5 September 2018, a reporter from Buzzfeed News published an email written by Musk on August 30 marked "off the record", saying "I suggest that you call people you know in Thailand, find out what's actually going on and stop defending child rapists, you fucking asshole. As for this alleged threat of a lawsuit, which magically appeared when I raised the issue ... I fucking hope he sues me." Musk confirmed that he had sent the email. The diver subsequently filed a defamation suit in Los Angeles federal court in mid-September 2018, with plans to also file a similar case in the United Kingdom. The lawsuit contends that "Musk embarked on a PR campaign to destroy [the diver]'s reputation by publishing false and heinous accusations of criminality against him to the public", and seeks upwards of US$75,000 in damages.

Teslaquila

Musk first mentioned Teslaquila in an April Fools tweet in 2018. The proposed Tesla-branded tequila become closer to a reality in October 2018 as Tesla filed an 'intent to use' trademark application with the U.S. Patent and Trademark Office. The trademark is for distilled agave liquor. Musk reaffirmed his intention to release the product with a tweet, featuring a mockup of the bottle, on October 12.

Mexico's Tequila Regulatory Council (CRT) has publicly denounced the proposed product, arguing, "If it wants to make Teslaquila viable as a tequila it would have to associate itself with an authorized tequila producer, comply with certain standards and request authorization from Mexico's Industrial Property Institute".

Music

On March 30, 2019, Musk released a rap single to SoundCloud under the username "Emo G Records". Titled "RIP Harambe", the track was performed by Yung Jake, written by Yung Jake and Caroline Polachek, and produced by BloodPop. Within ten days, the song had achieved more than 2,000,000 plays.

Views

Political

Musk speaking alongside former Irish Taoiseach (Prime Minister) Enda Kenny in 2013
 
Politically, Musk has described himself as "half Democrat, half Republican" and "I'm somewhere in the middle, socially liberal and fiscally conservative." Prompted by the emergence of self-driving cars and artificial intelligence, Musk has voiced support for a universal basic income; he additionally backs direct democracy. He has described himself as a socialist, but "not the kind that shifts resources from most productive to least productive, pretending to do good, while actually causing harm" - arguing instead, "true socialism seeks greatest good for all." He supports targeting an inclusive tax rate of 40%, prefers consumption taxes to income taxes, and supports the estate tax, as the "probability of progeny being equally excellent at capital allocation is not high."

Musk has described the United States as "[inarguably] the greatest country that has ever existed on Earth," describing it as "the greatest force for good of any country that's ever been." Musk believes democracy would not exist any longer if not for the United States, saying that it prevented this disappearance on three occasions through its participation in World War I, World War II and the Cold War. Musk also stated that he thinks "it would be a mistake to say the United States is perfect, it certainly is not. There have been many foolish things the United States has done and bad things the United States has done."

Before the election of Donald Trump as President of the United States, Musk criticized candidate Trump by saying: "I feel a bit stronger that he is probably not the right guy. He doesn't seem to have the sort of character that reflects well on the United States." Following Donald Trump's inauguration, Musk expressed approval of Trump's choice of Rex Tillerson as Secretary of State and accepted an invitation to appear on a panel advising President Trump. Regarding his cooperation with Trump, Musk has subsequently commented: "The more voices of reason that the President hears, the better." He subsequently resigned from both in June 2017, in protest at Trump's decision to withdraw the United States from the Paris Agreement on climate change.

Lobbying

In an interview with The Washington Post, Musk stated he was a "significant (though not top-tier) donor to Democrats," but that he also gives heavily to Republicans. Musk further stated that political contributions are a requirement in order to have a voice in the United States government.

A 2012 report from the Sunlight Foundation, a nonpartisan group that tracks government spending, found that since 2002, SpaceX had spent more US$4 million on lobbying the United States Congress and more than US$800,000 in political contributions to Democrats and Republicans. The same report said that "SpaceX's campaign to win political support has been systematic and sophisticated," and that "unlike most tech-startups, SpaceX has maintained a significant lobbying presence in Washington almost since day 1." and that "Musk himself has donated roughly US$725,000 to various campaigns since 2002. In 2004, he contributed US$2,000 to President George W. Bush's reelection campaign, maxing out (over US$100,000) to Barack Obama's reelection campaign and donated US$5,000 to Republican Sen. Marco Rubio, who represents Florida, a state critical to the space industry. (...) All told, Musk and SpaceX gave out roughly US$250,000 in the 2012 election cycle." Additionally, SpaceX hired former Republican Senate Majority Leader Trent Lott to represent the company, via the Washington-based lobbying group Patton Boggs LLP. Alongside Patton Boggs LLP, SpaceX uses several other outside lobbying firms, who work with SpaceX's own lobbyists.

Musk had been a supporter of the U.S. political action committee (PAC) FWD.us, which was started by fellow high-profile entrepreneur Mark Zuckerberg and advocates for immigration reform. However, in May 2013, Musk publicly withdrew his support in protest of advertisements the PAC was running that supported causes like the Keystone Pipeline. Musk and other members, including David O. Sacks, pulled out, criticizing the strategy as "cynical." Musk further stated, "we shouldn't give in to the politics. If we give in to that, we'll get the political system we deserve."

In December 2013, Sean Becker of the media/political website Mic called Musk a "complete hypocrite," stating that "[for] the 2014 election cycle, Musk has contributed to the Longhorn PAC and the National Republican Congressional Committee – both of which have funded the campaigns of anti-science, anti-environment candidates such as Rep. Michelle Bachman (R-Minn.)." Musk has directly contributed to Republican Sen. Marco Rubio, who has been accused of holding similar positions regarding climate change.

Subsidies

Musk has stated that he does not believe the U.S. government should provide subsidies to companies but should instead use a carbon tax to price in the negative externality of air pollution and discourage poor behavior. Musk says that the free market would achieve the best solution, and that producing environmentally unfriendly vehicles should come with its own consequences.

Musk's statements have been widely criticized, with Stanford University Professor Fred Turner noting that "if you're an entrepreneur like Elon Musk, you will take the money where you can get it, but at the same time believe as a matter of faith that it's entrepreneurship and technology that are the sources of social change, not the state. It is not quite self-delusion, but there is a habit of thinking of oneself as a free-standing, independent agent, and of not acknowledging the subsidies that one received. And this goes on all the time in Silicon Valley." Author Michael Shellenberger argued that "in the case of Musk, it is hard not to read that as a kind of defensiveness. And I think there is a business reason for it. They are dealing with a lot of investors for whom subsidies are not the basis for a long-term viable business, and they often want to exaggerate the speed with which they are going to be able to become independent." Shellenberger continues, "we would all be better off if these entrepreneurs were a bit more grateful, a bit more humble." While journalist and author Jim Motavalli, who interviewed Musk for High Voltage, his 2011 book about the electric vehicle industry, speculated that "Elon is now looking at it from the point of view of a winner, and he doesn't want to see other people win because they get government money – I do think there is a tendency of people, once they have succeeded, to want to pull the ladder up after them."

In 2015, Musk's statements were subject to further scrutiny when an LA Times article claimed that SpaceX, Tesla, SolarCity and buyers of their products had or were projected to receive together an estimated US$4.9 billion in government subsidies over twenty years. One example given is New York state, which is spending $750 million to build a solar panel factory in Buffalo which will be leased to SolarCity for $1 a year. The deal also includes no property taxes for a decade, an estimated $260 million valuation. Musk employs a former U.S. State Department official as the chief negotiator for Tesla.

Destiny and religion

When asked whether he believed "there was some kind of destiny involved" in humanity's transition to a multi-planetary species, rather than "just physics," Musk responded:
Well, I do. Do I think that there's some sort of master intelligence architecting all of this stuff? I think probably not because then you have to say: "Where does the master intelligence come from?" So it sort of begs the question. So I think really you can explain this with the fundamental laws of physics. You know it's complex phenomenon from simple elements.
Musk has stated that he does not pray, or worship any being, although he asked "any entities that [were] listening" to "bless [the] launch" before an important Falcon 1 launch. When asked whether he believed that religion and science could co-exist, Musk said most likely not.

Extraterrestrial life

Although Musk believes there could be simple life on other planets, he is unsure whether other intelligent life is likely. Musk later said that he "hope[s] that there is other intelligent life in the known universe," and stated that it is "probably more likely than not, but that's a complete guess."

Musk has also considered the simulation hypothesis as a potential solution to the Fermi paradox:
The absence of any noticeable life may be an argument in favour of us being in a simulation ... Like when you're playing an adventure game, and you can see the stars in the background, but you can't ever get there. If it's not a simulation, then maybe we're in a lab and there's some advanced alien civilization that's just watching how we develop, out of curiosity, like mould in a Petri dish ... If you look at our current technology level, something strange has to happen to civilizations, and I mean strange in a bad way. ... And it could be that there are a whole lot of dead, one-planet civilizations.

Artificial intelligence

Musk has frequently spoken about the potential dangers of artificial intelligence, calling it "the most serious threat to the survival of the human race." During a 2014 interview at the MIT AeroAstro Centennial Symposium, Musk described AI as humanity's largest existential threat, further stating, "I'm increasingly inclined to think that there should be some regulatory oversight, maybe at the national and international level, just to make sure that we don't do something very foolish." Musk described the creation of artificial intelligence as "summoning the demon".

Despite this, Musk has previously invested in DeepMind, an AI firm, and Vicarious, a company working to improve machine intelligence. In January 2015, he donated $10 million to the Future of Life Institute, an organization focused on challenges posed by advanced technologies. He is the co-chairman of OpenAI, a nonprofit artificial intelligence research company.

Musk has said that his investments are, "not from the standpoint of actually trying to make any investment return ... I like to just keep an eye on what's going on with artificial intelligence." Musk continued, "There have been movies about this, you know, like Terminator – there are some scary outcomes. And we should try to make sure the outcomes are good, not bad."

In June 2016, Musk was asked whether he thinks humans live in a computer simulation, to which he answered:
The strongest argument for us probably being in a simulation I think is the following: 40 years ago we had Pong – two rectangles and a dot. That's where we were. Now 40 years later we have photorealistic, 3D simulations with millions of people playing simultaneously and it's getting better every year. And soon we'll have virtual reality, we'll have augmented reality. If you assume any rate of improvement at all, then the games will become indistinguishable from reality, just indistinguishable.
Musk's warnings about artificial intelligence have brought him some controversy. He and Facebook founder Mark Zuckerberg have clashed, with the latter calling his warnings, "pretty irresponsible." Musk responded to Zuckerberg's censure by saying that he had discussed AI with Zuckerberg and found him to have only a limited understanding of the subject. In 2014, Slate's Adam Elkus argued that current AIs were as intelligent as a toddlers, and only in certain fields, going on to say that Musk's "summoning the demon" analogy may be harmful because it could result in significant cuts to AI research budgets.

The Information Technology and Innovation Foundation (ITIF), a Washington D.C. think-tank, awarded its Annual Luddite Award to "alarmists touting an artificial intelligence apocalypse"; its president, Robert D. Atkinson, complained that Musk and others say AI is the largest existential threat to humanity. Atkinson stated "That's not a very winning message if you want to get AI funding out of Congress to the National Science Foundation." Nature sharply disagreed with the ITIF in an April 2016 editorial, siding instead with Musk, and concluding: "It is crucial that progress in technology is matched by solid, well-funded research to anticipate the scenarios it could bring about ... If that is a Luddite perspective, then so be it." In a 2015 Washington Post editorial, researcher Murray Shanahan stated that human-level AI is unlikely to arrive in the near future, but that nevertheless "the time to start thinking through the consequences is now."

Public transport

At a Tesla event on the sidelines of the Conference on Neural Information Processing Systems in December 2017, Musk stated that:
I think public transport is painful. It sucks. Why do you want to get on something with a lot of other people, that doesn't leave where you want it to leave, doesn't start where you want it to start, doesn't end where you want it to end? And it doesn't go all the time. ... It's a pain in the ass. That's why everyone doesn't like it. And there's like a bunch of random strangers, one of who might be a serial killer, OK, great. And so that's why people like individualized transport, that goes where you want, when you want.
Afterwards, he dismissed an audience member's response that public transportation functioned effectively in Japan.

His comment sparked widespread criticism from both the public and transit experts. Urban planning expert Brent Toderian started the hashtag #GreatThingsThatHappenedonTransit which was widely adopted by Twitter users in order to dispel Musk's notion that everybody hated public transport. Yonah Freemark, an urbanist and journalist specialising in planning and transportation, summarised Musk's views on public transport as "It's terrible. You might be killed. Japanese trains are awful. Individualized transport for everyone! Congestion? Induced demand? Climate change impacts? Unwalkable streets? Who cares!"

Jarrett Walker, a known public transport expert and consultant from Portland, said that "Musk's hatred of sharing space with strangers is a luxury (or pathology) that only the rich can afford," referring to the theory that planning a city around the preferences of a minority yields an outcome that usually does not work for the majority. Musk responded with "You're an idiot," later saying "Sorry ... Meant to say 'sanctimonious idiot.'" The exchange received a significant amount of media attention and prompted Nobel laureate Paul Krugman to comment on the controversy, saying that apparently, "You're an idiot" is Musk's idea of a cogent argument.

Personal life

Philanthropy

Musk is chairman of the Musk Foundation, which focuses its philanthropic efforts on providing solar-power energy systems in disaster areas. In 2010, the Musk Foundation collaborated with SolarCity to donate a 25-kW solar power system to the South Bay Community Alliance's hurricane response center in Coden, Alabama. In July 2011, the Musk Foundation donated US$250,000 towards a solar power project in Sōma, Japan, a city that had been recently devastated by a tsunami.

In July 2014, Musk was asked by cartoonist Matthew Inman and William Terbo, the grandnephew of Nikola Tesla, to donate US$8 million toward the construction of the Tesla Science Center at Wardenclyffe. Ultimately, Musk agreed to donate US$1 million toward the project and additionally pledged to build a Tesla Supercharger in the museum car park.

Musk donated US$10 million to the Future of Life Institute in January 2015, to run a global research program aimed at keeping artificial intelligence beneficial to humanity.

As of 2015, Musk is a trustee of the X Prize Foundation and a signatory of The Giving Pledge.

In October 2018, in an effort to help solve the Flint water crisis, Musk and the Musk Foundation donated over $480,000 to install new water fountains with filtration systems for access to clean water at all Flint, Michigan schools.

Family

Tosca Musk, Elon's sister, is a filmmaker. She is the founder of Musk Entertainment and has produced various movies.

Musk met his first wife, Canadian author Justine Wilson, while both were students at Ontario's Queen's University. They married in 2000 and separated in 2008. Their first son, Nevada Alexander Musk, died of sudden infant death syndrome (SIDS) at the age of 10 weeks. They later had five sons through in vitro fertilization – twins in 2004, followed by triplets in 2006. They share custody of all five sons.

In 2008, Musk began dating English actress Talulah Riley, and in 2010, the couple married. In January 2012, Musk announced that he had ended his four-year relationship with Riley, tweeting to Riley, "It was an amazing four years. I will love you forever. You will make someone very happy one day." In July 2013, Musk and Riley remarried. In December 2014, Musk filed for a second divorce from Riley; however, the action was withdrawn. The media announced in March 2016 that divorce proceedings were again under way, this time with Riley filing for divorce from Musk. The divorce was finalized in late 2016.

Musk began dating American actress Amber Heard in 2016 but the two split up after one year due to their conflicting schedules. On May 7, 2018, Musk and Canadian musician Grimes revealed that they had begun dating.

Joe Rogan podcast appearance

In mid-September 2018, Musk appeared on The Joe Rogan Experience podcast and discussed various topics for 21/2 hours. Within five days, the appearance had registered 10 million YouTube views. One of the highest profile and controversial aspects of the program was Musk's puffing from a cannabis-laced cigarette offered by Rogan. The Washington Post observed, "In the media's hands, it became a story about Musk's growing instability ..." Tesla stock dropped after the incident, which coincided with the confirmation of the departure of Tesla's Vice President of Worldwide Finance earlier that day. Fortune wondered if the cannabis use could have ramifications for SpaceX contracts with the United States Air Force, though a USAF spokesperson told The Verge that there was no investigation being carried out and that the Air Force is still processing the situation. In an interview on 60 Minutes, Musk said of the pot-smoking incident: "I do not smoke pot. As anybody who watched that podcast could tell, I have no idea how to smoke pot."

Awards and recognition

In popular media

2010–2016

In Iron Man 2 (2010), Musk met Tony Stark (Robert Downey Jr.) in a restaurant, and had some brief lines regarding an "idea for an electric jet." In January 2015, Musk made a guest appearance playing himself on The Simpsons in an episode titled "The Musk Who Fell to Earth"; the episode poked fun at many of Musk's ideas. In November 2015, Musk appeared in an episode of The Big Bang Theory, playing himself, volunteering at a soup kitchen with Wolowitz. Musk was featured in the 2015 environmental documentary Racing Extinction, in which a custom Tesla Model S was designed to help project images of critically endangered species onto public buildings, including the Empire State Building and the Vatican. In 2016, Musk appeared as himself in the romantic comedy film Why Him? where he was briefly met by one of the main characters, Ned Flemming played by Bryan Cranston, in a bar at a party. Also in 2016, Musk was referenced by Dr. Martin Stein on The CW time-travel TV show DC's Legends of Tomorrow. During time travel to the past, Stein meets his younger self and introduced himself as Elon Musk, to disguise his own identity.

2017–Present

In October 2017, Musk was prematurely immortalized as a historic pioneer on the CBS All Access series Star Trek: Discovery. Set in the year 2256, Captain Gabriel Lorca attempts to motivate a scientist on his ship by asking him "How do you want to be remembered in history? Alongside the Wright Brothers, Elon Musk, Zefram Cochrane? Or as a failed fungus expert. A selfish little man who put the survival of his own ego before the lives of others?" According to a TechCrunch article published the day after the episode aired, this mention is "also interesting because of its notable omission of Amazon and Blue Origin founder Jeff Bezos: This other space entrepreneur is such a big fan of Star Trek that he pitched and succeeded in landing a cameo in Star Trek Beyond as an alien being, but he doesn't rate a mention from Lorca among the spaceflight pantheon." Musk is significantly referenced numerous times in Hat Films' 2017 album, Neon Musk. In November 2017, Musk appeared as himself in season 1, episode 6 of The Big Bang Theory spin-off prequel series Young Sheldon. The successful first landing of a SpaceX Falcon 9 first stage on a drone ship on April 8, 2016, is shown being covered by CNN. This is followed by a scene where Musk is shown alone in his office reading the notebook that young Sheldon mailed NASA in 1989 (a scene shown earlier in the episode) containing calculations detailing how this feat could be accomplished. In February 2019, Musk co-hosted YouTuber PewDiePie's show "Meme Review" with Justin Roiland under the request of PewDiePie's fans.

Hydrogen production

From Wikipedia, the free encyclopedia

Hydrogen production is the family of industrial methods for generating hydrogen. Hydrogen is primarily produced by steam reforming of natural gas. Other major sources include naphtha or oil reforming of refinery or other industrial off-gases, and partial oxidation of coal and other hydrocarbons. A small amount is obtained by water electrolysis and other sources.
 
Steam-methane reforming is a mature production process in which high-temperature steam (700 °C–1,000 °C) is used to produce hydrogen from natural gas. Methane reacts with steam under 3–25 bar pressure in the presence of a catalyst to produce hydrogen, carbon monoxide, and a relatively small amount of carbon dioxide. For steam reforming to proceed, heat must be supplied to the process. In a separate reactor vessel, the carbon monoxide and steam are reacted using a catalyst to produce carbon dioxide and more hydrogen. In a final process step called "pressure-swing adsorption," carbon dioxide and other impurities are removed from the gas stream, leaving essentially pure hydrogen. Steam reforming can also be used to produce hydrogen from other fuels, such as coal and oil products.

There are no natural hydrogen deposits, but hydrogen is required for essential chemical processes. Therefore, the production of hydrogen plays a key role in any industrialized society. The hydrogen generation market is expected to be valued at $115.25 billion USD in 2017. Millions of tons of hydrogen were consumed on-site in oil refining, and in the production of ammonia (Haber process) and methanol (reduction of carbon monoxide). Hydrogen is also produced as a by-product of the chlor-alkali process.

As of 1999, the majority of hydrogen (∼95%) is produced from fossil fuels by steam reforming or partial oxidation of methane and coal gasification with only a small quantity by other routes such as biomass gasification or electrolysis of water. Around 8GW of electrolysis capacity is installed worldwide, accounting for around 4% of global hydrogen production. Developing affordable methods for producing hydrogen with less damage to the environment is a goal of the hydrogen economy. Electrolysis of water using electricity produced from fossil fuels emits significant amounts of CO2.

Steam reforming

There are four main sources for the commercial production of hydrogen: natural gas, oil, coal, and electrolysis; which account for 48%, 30%, 18% and 4% of the world’s hydrogen production respectively. Fossil fuels are the dominant source of industrial hydrogen. Carbon dioxide can be separated from natural gas with a 70-85% efficiency for hydrogen production and from other hydrocarbons to varying degrees of efficiency. Specifically, bulk hydrogen is usually produced by the steam reforming of methane or natural gas. The production of hydrogen from natural gas is the cheapest source of hydrogen currently. This process consists of heating the gas to between 700-1100 °C in the presence of steam and a nickel catalyst. The resulting endothermic reaction breaks up the methane molecules and forms carbon monoxide CO and hydrogen H2. The carbon monoxide gas can then be passed with steam over iron oxide or other oxides and undergo a water gas shift reaction to obtain further quantities of H2. The downside to this process is that its major byproducts are CO, CO2 and other greenhouse gases. Depending on the quality of the feedstock (natural gas, rich gases, naphtha, etc.), one ton of hydrogen produced will also produce 9 to 12 tons of CO2.

For this process high temperature (700–1100 °C) steam (H2O) reacts with methane (CH4) in an endothermic reaction to yield syngas.

Gasification
CH4 + H2O → CO + 3 H2
In a second stage, additional hydrogen is generated through the lower-temperature, exothermic, water gas shift reaction, performed at about 360 °C:
CO + H2O → CO2 + H2
Essentially, the oxygen (O) atom is stripped from the additional water (steam) to oxidize CO to CO2. This oxidation also provides energy to maintain the reaction. Additional heat required to drive the process is generally supplied by burning some portion of the methane.

CO2 sequestration

Steam reforming generates carbon dioxide (CO2). Since the production is concentrated in one facility, it is possible to separate the CO2 and dispose of it without atmospheric release, for example by injecting it in an oil or gas reservoir, although this is not currently done in most cases. A carbon dioxide injection project has been started by the Norwegian company Statoil in the North Sea, at the Sleipner field.

Integrated steam reforming / co-generation - It is possible to combine steam reforming and co-generation of steam and power into a single plant. This can deliver benefits for an oil refinery because it is more efficient than separate hydrogen, steam and power plants. Air Products recently built an integrated steam reforming / co-generation plant in Port Arthur, Texas.

Other production methods from fossil fuels

Partial oxidation

Hydrogen production from natural gas or other hydrocarbons is achieved by partial oxidation. A fuel-air or fuel-oxygen mixture is partially combusted resulting in a hydrogen rich syngas. Hydrogen and carbon monoxide are obtained via the water-gas shift reaction. Carbon dioxide can be co-fed to lower the hydrogen to carbon monoxide ratio. 

The partial oxidation reaction occurs when a substoichiometric fuel-air mixture or fuel-oxygen is partially combusted in a reformer or partial oxidation reactor. A distinction is made between thermal partial oxidation (TPOX) and catalytic partial oxidation (CPOX). The chemical reaction takes the general form:
CnHm + n/2 O2n CO + m/2 H2
Idealized examples for heating oil and coal, assuming compositions C12H24 and C24H12 respectively, are as follows:
C12H24 + 6 O2 → 12 CO + 12 H2
C24H12 + 12 O2 → 24 CO + 6 H2

Plasma reforming

The Kværner-process or Kvaerner carbon black & hydrogen process (CB&H) is a plasma reforming method, developed in the 1980s by a Norwegian company of the same name, for the production of hydrogen and carbon black from liquid hydrocarbons (CnHm). Of the available energy of the feed, approximately 48% is contained in the hydrogen, 40% is contained in activated carbon and 10% in superheated steam. CO2 is not produced in the process. 

A variation of this process is presented in 2009 using plasma arc waste disposal technology for the production of hydrogen, heat and carbon from methane and natural gas in a plasma converter.

Coal

For the production of hydrogen from coal, coal gasification is used. The process of coal gasification uses steam and a carefully controlled concentration of gases to break molecular bonds in coal and form a gaseous mix of hydrogen and carbon monoxide. This source of hydrogen is advantageous since its main product is coal-derived gas which can be used for fuel. The gas obtained from coal gasification can later be used to produce electricity more efficiently and allow a better capture of greenhouse gases than the traditional burning of coal.

Another method for conversion is low temperature and high temperature coal carbonization.

Petroleum coke

Similarly to coal, petroleum coke can also be converted in hydrogen rich syngas, via coal gasification. The syngas in this case consists mainly of hydrogen, carbon monoxide and H2S, depending on the sulfur content of the coke feed. Gasification is an attractive option for producing hydrogen from almost any carbon source, while providing attractive hydrogen utilization alternatives through process integration.

From water

Many technologies have been explored but, as of 2007, "Thermal, thermochemical, biochemical and photochemical processes have so far not found industrial applications." High temperature electrolysis of alkaline solutions has been used for the industrial scale production of hydrogen and there are now a number of small scale polymer electrolyte membrane (PEM) electrolysis units available commercially.

Gas Extraction

Electrolysis consists of using electricity to split water into hydrogen and oxygen. Electrolysis of water is 70-80% efficient (a 20-30% conversion loss) while steam reforming of natural gas has a thermal efficiency between 70-85%. The (electrical) efficiency of electrolysis is expected to reach 82-86% before 2030, while also maintaining durability as progress in this area continues at a pace. Water electrolysis can operate between 50-80 °C, while steam methane reforming requires temperatures between 700-1100 °C. The difference between the two methods is the primary energy used; either electricity (for electrolysis) or natural gas (for steam methane reforming). Due to their use of water, a readily available resource, electrolysis and similar water-splitting methods have attracted the interest of the scientific community. With the objective of reducing the cost of hydrogen production, renewable sources of energy have been targeted to allow electrolysis. There are three main types of cells, solid oxide electrolysis cells (SOECs), polymer electrolyte membrane cells (PEM) and alkaline electrolysis cells (AECs). SOECs operate at high temperatures, typically around 800 °C. At these high temperatures a significant amount of the energy required can be provided as thermal energy (heat), and as such is termed High temperature electrolysis. The heat energy can be provided from a number of different sources, including waste industrial heat, nuclear power stations or concentrated solar thermal plants. This has the potential to reduce the overall cost of the hydrogen produced by reducing the amount of electrical energy required for electrolysis. PEM electrolysis cells typically operate below 100 °C and are becoming increasingly available commercially. These cells have the advantage of being comparatively simple and can be designed to accept widely varying voltage inputs which makes them ideal for use with renewable sources of energy such as solar PV. AECs optimally operate at high concentrations electrolyte (KOH or potassium carbonate) and at high temperatures, often near 200 °C.

Industrial output and efficiency

Efficiency of modern hydrogen generators is measured by energy consumed per standard volume of hydrogen (MJ/m3), assuming standard temperature and pressure of the H2. The lower the energy used by a generator, the higher would be its efficiency; a 100%-efficient electrolyser would consume 39.4 kilowatt-hours per kilogram (142 MJ/kg) of hydrogen, 12,749 joules per litre (12.75 MJ/m3). Practical electrolysis (using a rotating electrolyser at 15 bar pressure) may consume 50 kilowatt-hours per kilogram (180 MJ/kg), and a further 15 kilowatt-hours (54 MJ) if the hydrogen is compressed for use in hydrogen cars.

Electrolyser vendors provide efficiencies based on enthalpy. To assess the claimed efficiency of an electrolyser it is important to establish how it was defined by the vendor (i.e. what enthalpy value, what current density, etc.). 

There are two main technologies available on the market, alkaline and proton exchange membrane (PEM) electrolysers. Traditionally, alkaline electrolysers are cheaper in terms of investment (they generally use nickel catalysts), but less efficient; PEM electrolysers, conversely, are more expensive (they generally use expensive platinum-group metal catalysts) but are more efficient and can operate at higher current densities, and can therefore be possibly cheaper if the hydrogen production is large enough. 

Conventional alkaline electrolysis has an efficiency of about 70%, however thyssenkrupp have recently developed an advanced alkaline water electrolyser with an efficiency of 82%. Accounting for the use of the higher heat value (because inefficiency via heat can be redirected back into the system to create the steam required by the catalyst), average working efficiencies for PEM electrolysis are around 80%, or 82% using the most modern alkaline electrolysers. PEM efficiency is expected to increase to approximately 86% before 2030. Theoretical efficiency for PEM electrolysers are predicted up to 94%.

H2 production cost ($-gge untaxed) at varying natural gas prices
 
Considering the industrial production of hydrogen, and using current best processes for water electrolysis (PEM or alkaline electrolysis) which have an effective electrical efficiency of 70-82%, producing 1 kg of hydrogen (which has a specific energy of 143 MJ/kg or about 40 kWh/kg) requires 50–55 kWh of electricity. At an electricity cost of $0.06/kWh, as set out in the Department of Energy hydrogen production targets for 2015, the hydrogen cost is $3/kg. With the range of natural gas prices from 2016 as shown in the graph (Hydrogen Production Tech Team Roadmap, November 2017) putting the cost of SMR hydrogen at between $1.20 and $1.50, the cost price of hydrogen via electrolysis is still over double 2015 DOE hydrogen target prices. The US DOE target price for hydrogen in 2020 is $2.30/kg, requiring an electricity cost of $0.037/kWh, which is achievable given recent PPA tenders for wind and solar in many regions. This puts the $4/gge H2 dispensed objective well within reach, and close to a slightly elevated natural gas production cost for SMR. 

In many cases, the advantage of electrolysis over SMR hydrogen is that the hydrogen can be produced on-site, meaning that the costly process of delivery via truck or pipeline is avoided. 

In other parts of the world, steam methane reforming is between $1–3/kg on average. This makes production of hydrogen via electrolysis cost competitive in many regions already, as outlined by Nel Hydrogen and others, including an article by the IEA examining the conditions which could lead to a competitive advantage for electrolysis.

Chemically assisted electrolysis (Carbon/hydrocarbon assisted water electrolysis; CAWE)

In addition to reducing the voltage required for electrolysis via the increasing of the temperature of the electrolysis cell it is also possible to electrochemically consume the oxygen produced in an electrolyser by introducing a fuel (such as carbon/coal, methanol, ethanol, formic acid, glycerol, etc.) into the oxygen side of the reactor. This reduces the required electrical energy and has the potential to reduce the cost of hydrogen to less than 40~60% with the remaining energy provided in this manner. In addition, carbon/hydrocarbon assisted electrolysis has the potential to offer a less energy intensive, cleaner method of using chemical energy in various sources of carbon, such as low-rank and high sulfur coals, biomass, alcohols and methane (Natural Gas), where pure CO2 produced can be easily sequestered without the need for separation.

Radiolysis

Nuclear radiation can break water bonds(citation needed). In the Mponeng gold mine, South Africa, researchers found in a naturally high radiation zone a community dominated by a new phylotype of Desulfotomaculum, feeding on primarily radiolytically produced H2. Spent nuclear fuel is also being looked at as a potential source of hydrogen.

Thermolysis

Water spontaneously dissociates at around 2500 °C, but this thermolysis occurs at temperatures too high for usual process piping and equipment. Catalysts are required to reduce the dissociation temperature.

Thermochemical cycle

Thermochemical cycles combine solely heat sources (thermo) with chemical reactions to split water into its hydrogen and oxygen components. The term cycle is used because aside from water, hydrogen and oxygen, the chemical compounds used in these processes are continuously recycled. If electricity is partially used as an input, the resulting thermochemical cycle is defined as a hybrid one.

The sulfur-iodine cycle (S-I cycle) is a thermochemical cycle processes which generates hydrogen from water with an efficiency of approximately 50%. The sulfur and iodine used in the process are recovered and reused, and not consumed by the process. The cycle can be performed with any source of very high temperatures, approximately 950 °C, such as by Concentrating solar power systems (CSP) and is regarded as being well suited to the production of hydrogen by high-temperature nuclear reactors, and as such, is being studied in the High Temperature Test Reactor in Japan. There are other hybrid cycles that use both high temperatures and some electricity, such as the Copper–chlorine cycle, it is classified as a hybrid thermochemical cycle because it uses an electrochemical reaction in one of the reaction steps, it operates at 530 °C and has an efficiency of 43 percent.

Ferrosilicon method

Ferrosilicon is used by the military to quickly produce hydrogen for balloons. The chemical reaction uses sodium hydroxide, ferrosilicon, and water. The generator is small enough to fit a truck and requires only a small amount of electric power, the materials are stable and not combustible, and they do not generate hydrogen until mixed. The method has been in use since World War I. A heavy steel pressure vessel is filled with sodium hydroxide and ferrosilicon, closed, and a controlled amount of water is added; the dissolving of the hydroxide heats the mixture to about 93 °C and starts the reaction; sodium silicate, hydrogen and steam are produced.

Photobiological water splitting

An algae bioreactor for hydrogen production.

Biological hydrogen can be produced in an algae bioreactor. In the late 1990s it was discovered that if the algae are deprived of sulfur it will switch from the production of oxygen, i.e. normal photosynthesis, to the production of hydrogen. It seems that the production is now economically feasible by surpassing the 7–10 percent energy efficiency (the conversion of sunlight into hydrogen) barrier. with a hydrogen production rate of 10-12 ml per liter culture per hour.

Photocatalytic water splitting

The conversion of solar energy to hydrogen by means of water splitting process is one of the most interesting ways to achieve clean and renewable energy systems. However, if this process is assisted by photocatalysts suspended directly in water instead of using photovoltaic and an electrolytic system the reaction is in just one step, it can be made more efficient.

Biohydrogen routes

Biomass and waste streams can in principle be converted into biohydrogen with biomass gasification, steam reforming, or biological conversion like biocatalysed electrolysis or fermentative hydrogen production.

Among hydrogen production methods such as steam methane reforming, thermal cracking, coal and biomass gasification and pyrolysis, electrolysis, and photolysis, biological ones are more eco-friendly and less energy intensive. In addition, a wide variety of waste and low-value materials such as agricultural biomass as renewable sources can be utilized to produce hydrogen via biochemical pathways. Nevertheless, at present hydrogen is produced mainly from fossil fuels, in particular, natural gas which are non-renewable sources. Hydrogen is not only the cleanest fuel but also widely used in a number of industries, especially fertilizer, petrochemical and food ones. This makes it logical to investigate alternative sources for hydrogen production. The main biochemical technologies to produce hydrogen are dark and photo fermentation processes. In dark fermentation, carbohydrates are converted to hydrogen by fermentative microorganisms including strict anaerobe and facultative anaerobe bacteria. A theoretical maximum of 4 mol H2/mol glucose can be produced and, besides hydrogen, sugars are converted to volatile fatty acids (VFAs) and alcohols as by-products during this process. Photo fermentative bacteria are able to generate hydrogen from VFAs. Hence, metabolites formed in dark fermentation can be used as feedstock in photo fermentation to enhance the overall yield of hydrogen.

Fermentative hydrogen production

Fermentative hydrogen production is the fermentative conversion of organic substrate to biohydrogen manifested by a diverse group of bacteria using multi enzyme systems involving three steps similar to anaerobic conversion. Dark fermentation reactions do not require light energy, so they are capable of constantly producing hydrogen from organic compounds throughout the day and night. Photofermentation differs from dark fermentation because it only proceeds in the presence of light. For example, photo-fermentation with Rhodobacter sphaeroides SH2C can be employed to convert small molecular fatty acids into hydrogen.

Fermentative hydrogen production can be done using direct biophotolysis by green algae, indirect biophotolysis by cyanobacteria, photo-fermentation by anaerobic photosynthetic bacteria and dark fermentation by anaerobic fermentative bacteria. For example, studies on hydrogen production using H. salinarium, an anaerobic photosynthetic bacteria, coupled to a hydrogenase donor like E. coli, are reported in literature.

Enterobacter aerogenes is an outstanding hydrogen producer. It is an anaerobic facultative and mesophilic bacterium that is able to consume different sugars and in contrast to cultivation of strict anaerobes, no special operation is required to remove all oxygen from the fermenter. E. aerogenes has a short doubling time and high hydrogen productivity and evolution rate. Furthermore, hydrogen production by this bacterium is not inhibited at high hydrogen partial pressures; however, its yield is lower compared to strict anaerobes like Clostridia. A theoretical maximum of 4 mol H2/mol glucose can be produced by strict anaerobic bacteria. Facultative anaerobic bacteria such as E. aerogenes have a theoretical maximum yield of 2 mol H2/mol glucose.

Biohydrogen can be produced in bioreactors that utilize feedstocks, the most common feedstock being waste streams. The process involves bacteria feeding on hydrocarbons and exhaling hydrogen and CO2. The CO2 can be sequestered successfully by several methods, leaving hydrogen gas. In 2006-2007, NanoLogix first demonstrated a prototype hydrogen bioreactor using waste as a feedstock at Welch's grape juice factory in Pennsylvania (U.S.).

Enzymatic hydrogen generation

Due to the Thauer limit (four H2/glucose) for dark fermentation, a non-natural enzymatic pathway was designed that can generate 12 moles of hydrogen per mole of glucose units of polysaccharides and water in 2007. The stoichiometric reaction is:
C6H10O5 + 7 H2O → 12 H2 + 6 CO2
The key technology is cell-free synthetic enzymatic pathway biotransformation (SyPaB). A biochemist can understand it as "glucose oxidation by using water as oxidant". A chemist can describe it as "water splitting by energy in carbohydrate". A thermodynamics scientist can describe it as the first entropy-driving chemical reaction that can produce hydrogen by absorbing waste heat. In 2009, cellulosic materials were first used to generate high-yield hydrogen. Furthermore, the use of carbohydrate as a high-density hydrogen carrier was proposed so to solve the largest obstacle to the hydrogen economy and propose the concept of sugar fuel cell vehicles.

Biocatalysed electrolysis

A microbial electrolysis cell

Besides dark fermentation, electrohydrogenesis (electrolysis using microbes) is another possibility. Using microbial fuel cells, wastewater or plants can be used to generate power. Biocatalysed electrolysis should not be confused with biological hydrogen production, as the latter only uses algae and with the latter, the algae itself generates the hydrogen instantly, where with biocatalysed electrolysis, this happens after running through the microbial fuel cell and a variety of aquatic plants can be used. These include reed sweetgrass, cordgrass, rice, tomatoes, lupines and algae.

Xylose

In 2014 a low-temperature 50 °C (122 °F), atmospheric-pressure enzyme-driven process to convert xylose into hydrogen with nearly 100% of the theoretical yield was announced. The process employs 13 enzymes, including a novel polyphosphatexylulokinase (XK).

Carbon-neutral hydrogen

Currently there are two practical ways of producing hydrogen in a renewable industrial process. One is to use power to gas, in which electric power is used to produce hydrogen from electrolysis, and the other is to use landfill gas to produce hydrogen in a steam reformer. Hydrogen fuel, when produced by renewable sources of energy like wind or solar power, is a renewable fuel.

Use of hydrogen

Hydrogen is mainly used for the conversion of heavy petroleum fractions into lighter ones via the process of hydrocracking and other processes (dehydrocyclization and the aromatization process). It is also required for cleaning fossil fuels via hydrodesulfurization.

Hydrogen is mainly used for the production of ammonia via Haber process. In this case, the hydrogen is produced in situ. Ammonia is the major component of most fertilizers

Earlier it was common to vent the surplus hydrogen off, nowadays the process systems are balanced with hydrogen pinch to collect hydrogen for further use. 

Hydrogen may be used in fuel cells for local electricity generation, making it possible for hydrogen to be used as a transportation fuel for an electric vehicle

Hydrogen is also produced as a by-product of industrial chlorine production by electrolysis. Although requiring expensive technologies, hydrogen can be cooled, compressed and purified for use in other processes on site or sold to a customer via pipeline, cylinders or trucks. The discovery and development of less expensive methods of production of bulk hydrogen is relevant to the establishment of a hydrogen economy.

Galvanic cell

From Wikipedia, the free encyclopedia

Galvanic cell with no cation flow
 
A galvanic cell or voltaic cell, named after Luigi Galvani or Alessandro Volta, respectively, is an electrochemical cell that derives electrical energy from spontaneous redox reactions taking place within the cell. It generally consists of two different metals immersed in an electrolyte, or of individual half-cells with different metals and their ions in solution connected by a salt bridge or separated by a porous membrane. 

Volta was the inventor of the voltaic pile, the first electrical battery. In common usage, the word "battery" has come to include a single galvanic cell, but a battery properly consists of multiple cells.

History

In 1780, Luigi Galvani discovered that when two different metals (e.g., copper and zinc) are in contact and then both are touched at the same time to two different parts of a muscle of a frog leg, to close the circuit, the frog's leg contracts. He called this "animal electricity". The frog's leg, as well as being a detector of electrical current, was also the electrolyte (to use the language of modern chemistry). 

A year after Galvani published his work (1790), Alessandro Volta showed that the frog was not necessary, using instead a force-based detector and brine-soaked paper (as electrolyte). (Earlier Volta had established the law of capacitance CQ/V with force-based detectors). In 1799 Volta invented the voltaic pile, which is a pile of galvanic cells each consisting of a metal disk, an electrolyte layer, and a disk of a different metal. He built it entirely out of non-biological material to challenge Galvani's (and the later experimenter Leopoldo Nobili)'s animal electricity theory in favor of his own metal-metal contact electricity theory. Carlo Matteucci in his turn constructed a battery entirely out of biological material in answer to Volta. Volta's contact electricity view characterized each electrode with a number that we would now call the work function of the electrode. This view ignored the chemical reactions at the electrode-electrolyte interfaces, which include H2 formation on the more noble metal in Volta's pile. 

Although Volta did not understand the operation of the battery or the galvanic cell, these discoveries paved the way for electrical batteries; Volta's cell was named an IEEE Milestone in 1999.

Some forty years later, Faraday showed that the galvanic cell -- now often called a voltaic cell -- was chemical in nature. Faraday introduced new terminology to the language of chemistry: electrode (cathode and anode), electrolyte, and ion (cation and anion). Thus Galvani incorrectly thought the source of electricity (or source of emf, or seat of emf) was in the animal, Volta incorrectly thought it was in the physical properties of the isolated electrodes, but Faraday correctly identified the source of emf as the chemical reactions at the two electrode-electrolyte interfaces. The authoritative work on the intellectual history of the voltaic cell remains that by Ostwald.

It was suggested by Wilhelm König in 1940 that the object known as the Baghdad battery might represent galvanic cell technology from ancient Parthia. Replicas filled with citric acid or grape juice have been shown to produce a voltage. However, it is far from certain that this was its purpose—other scholars have pointed out that it is very similar to vessels known to have been used for storing parchment scrolls.

Basic description

Schematic of Zn-Cu galvanic cell
 
In its simplest form, a half-cell consists of a solid metal (called an electrode) that is submerged in a solution; the solution contains cations (+) of the electrode metal and anions (−) to balance the charge of the cations. The full cell consists of two half-cells, usually connected by a semi-permeable membrane or by a salt bridge that prevents the ions of the more noble metal from plating out at the other electrode. 

A specific example is the Daniell cell (see figure), with a zinc (Zn) half-cell containing a solution of ZnSO4 (zinc sulfate) and a copper (Cu) half-cell containing a solution of CuSO4 (copper sulfate). A salt bridge is used here to complete the electric circuit. 

If an external electrical conductor connects the copper and zinc electrodes, zinc from the zinc electrode dissolves into the solution as Zn2+ ions (oxidation), releasing electrons that enter the external conductor. To compensate for the increased zinc ion concentration, via the salt bridge zinc ions leave and anions enter the zinc half-cell. In the copper half-cell, the copper ions plate onto the copper electrode (reduction), taking up electrons that leave the external conductor. Since the Cu2+ ions (cations) plate onto the copper electrode, the latter is called the cathode. Correspondingly the zinc electrode is the anode. The electrochemical reaction is:
Zn + Cu2+ → Zn2+ + Cu
In addition, electrons flow through the external conductor, which is the primary application of the galvanic cell. 

The EMF of the cell is the difference of the half-cell potentials, a measure of the relative ease of dissolution of the two electrodes into the electrolyte. The emf depends on both the electrodes and on the electrolyte, an indication that the emf is chemical in nature.

Electrochemical thermodynamics of galvanic cell reactions

The electrochemical processes in a galvanic cell occur because reactants of high free energy (e.g. metallic Zn and hydrated Cu2+ in the Daniell cell) are converted to lower-energy products (metallic Cu and hydrated Zn2+ in this example). The difference in the lattice cohesive energies  of the electrode metals is sometimes the dominant energetic driver of the reaction, specifically in the Daniell cell. Metallic Zn, Cd, Li, and Na, which are not stabilized by d-orbital bonding, have higher cohesive energies (i.e. they are more weakly bonded) than all transition metals, including Cu, and are therefore useful as high-energy anode metals.

The difference between the metals' ionization energies in water  is the other energetic contribution that can drive the reaction in a galvanic cell; it is not important in the Daniell cell because the energies of hydrated Cu2+ and Zn2+ ions happen to be similar. Both atom transfer, e.g. of zinc from the metal electrode into the solution, and electron transfer, from metal atoms or to metal ions, play important roles in a galvanic cell. Concentration cells, whose electrodes and ions are made of the same metal and which are driven by an entropy increase and free-energy decrease as ion concentrations equalize, show that the electronegativity difference of the metals is not the driving force of electrochemical processes. 

Galvanic cells and batteries are typically used as a source of electrical power. The energy derives from a high-cohesive-energy metal dissolving while to a lower-energy metal is deposited, and/or from high-energy metal ions plating out while lower-energy ions go into solution. 

Quantitatively, the electrical energy produced by a galvanic cell is approximately equal to the standard free-energy difference of the reactants and products, denoted as ΔrGo. In the Daniell cell, most of the electrical energy of ΔrGo = -213 kJ/mol can be attributed to the -207 kJ/mol difference between Zn and Cu lattice cohesive energies.

Half reactions and conventions

A half-cell contains a metal in two oxidation states. Inside an isolated half-cell, there is an oxidation-reduction (redox) reaction that is in chemical equilibrium, a condition written symbolically as follows (here, "M" represents a metal cation, an atom that has a charge imbalance due to the loss of "n" electrons):
Mn+ (oxidized species) + ne ⇌ M (reduced species)
A galvanic cell consists of two half-cells, such that the electrode of one half-cell is composed of metal A, and the electrode of the other half-cell is composed of metal B; the redox reactions for the two separate half-cells are thus:
An+ + ne ⇌ A
Bm+ + me ⇌ B
The overall balanced reaction is
m A + n Bm+n B + m An+
In other words, the metal atoms of one half-cell are oxidized while the metal cations of the other half-cell are reduced. By separating the metals in two half-cells, their reaction can be controlled in a way that forces transfer of electrons through the external circuit where they can do useful work.
  • The electrodes are connected with a metal wire in order to conduct the electrons that participate in the reaction.
In one half-cell, dissolved metal-B cations combine with the free electrons that are available at the interface between the solution and the metal-B electrode; these cations are thereby neutralized, causing them to precipitate from solution as deposits on the metal-B electrode, a process known as plating.
This reduction reaction causes the free electrons throughout the metal-B electrode, the wire, and the metal-A electrode to be pulled into the metal-B electrode. Consequently, electrons are wrestled away from some of the atoms of the metal-A electrode, as though the metal-B cations were reacting directly with them; those metal-A atoms become cations that dissolve into the surrounding solution.
As this reaction continues, the half-cell with the metal-A electrode develops a positively charged solution (because the metal-A cations dissolve into it), while the other half-cell develops a negatively charged solution (because the metal-B cations precipitate out of it, leaving behind the anions); unabated, this imbalance in charge would stop the reaction. The solutions of the half-cells are connected by a salt bridge or a porous plate that allows ions to pass from one solution to the other, which balances the charges of the solutions and allows the reaction to continue.
By definition:
  • The anode is the electrode where oxidation (loss of electrons) takes place (metal-A electrode); in a galvanic cell, it is the negative electrode, because when oxidation occurs, electrons are left behind on the electrode. These electrons then flow through the external circuit to the cathode (positive electrode) (while in electrolysis, an electric current drives electron flow in the opposite direction and the anode is the positive electrode).
  • The cathode is the electrode where reduction (gain of electrons) takes place (metal-B electrode); in a galvanic cell, it is the positive electrode, as ions get reduced by taking up electrons from the electrode and plate out (while in electrolysis, the cathode is the negative terminal and attracts positive ions from the solution). In both cases, the statement 'the cathode attracts cations' is true.
Galvanic cells, by their nature, produce direct current. The Weston cell has an anode composed of cadmium mercury amalgam, and a cathode composed of pure mercury. The electrolyte is a (saturated) solution of cadmium sulfate. The depolarizer is a paste of mercurous sulfate. When the electrolyte solution is saturated, the voltage of the cell is very reproducible; hence, in 1911, it was adopted as an international standard for voltage. 

A battery is a set of galvanic cells that are connected together to form a single source of voltage. For instance, a typical 12V lead–acid battery has six galvanic cells connected in series with the anodes composed of lead and cathodes composed of lead dioxide, both immersed in sulfuric acid. Large battery rooms, for instance in a telephone exchange providing central office power to user's telephones, may have cells connected in both series and parallel.

Cell voltage

The voltage (electromotive force Eo) produced by a galvanic cell can be estimated from the standard Gibbs free energy change in the electrochemical reaction according to 


where νe is the number of electrons transferred in the balanced half reactions, and F is Faraday's constant. However, it can be determined more conveniently by the use of a standard potential table for the two half cells involved. The first step is to identify the two metals and their ions reacting in the cell. Then one looks up the standard electrode potential, Eo, in volts, for each of the two half reactions. The standard potential of the cell is equal to the more positive Eo value minus the more negative Eo value. 

For example, in the figure above the solutions are CuSO4 and ZnSO4. Each solution has a corresponding metal strip in it, and a salt bridge or porous disk connecting the two solutions and allowing SO2−
4
ions to flow freely between the copper and zinc solutions. To calculate the standard potential one looks up copper and zinc's half reactions and finds:
Cu2+ + 2
e
⇌ Cu   Eo = +0.34 V
Zn2+ + 2
e
⇌ Zn   Eo = −0.76 V
Thus the overall reaction is:
Cu2+ + Zn ⇌ Cu + Zn2+
The standard potential for the reaction is then +0.34 V − (−0.76 V) = 1.10 V. The polarity of the cell is determined as follows. Zinc metal is more strongly reducing than copper metal because the standard (reduction) potential for zinc is more negative than that of copper. Thus, zinc metal will lose electrons to copper ions and develop a positive electrical charge. The equilibrium constant, K, for the cell is given by
where F is the Faraday constant, R is the gas constant and T is the temperature in kelvins. For the Daniell cell K is approximately equal to 1.5×1037. Thus, at equilibrium, a few electrons are transferred, enough to cause the electrodes to be charged.

Actual half-cell potentials must be calculated by using the Nernst equation as the solutes are unlikely to be in their standard states,
where Q is the reaction quotient. When the charges of the ions in the reaction are equal, this simplifies to
where {Mn+} is the activity of the metal ion in solution. In practice concentration in mol/L is used in place of activity. The metal electrode is in its standard state so by definition has unit activity. The potential of the whole cell is obtained as the difference between the potentials for the two half-cells, so it depends on the concentrations of both dissolved metal ions. If the concentrations are the same, and the Nernst equation is not needed under the conditions assumed here.
The value of 2.303R/F is 1.9845×10−4 V/K, so at 25 °C (298.15 K) the half-cell potential will change by only 0.05918 V/νe if the concentration of a metal ion is increased or decreased by a factor of 10.
These calculations are based on the assumption that all chemical reactions are in equilibrium. When a current flows in the circuit, equilibrium conditions are not achieved and the cell voltage will usually be reduced by various mechanisms, such as the development of overpotentials. Also, since chemical reactions occur when the cell is producing power, the electrolyte concentrations change and the cell voltage is reduced. A consequence of the temperature dependency of standard potentials is that the voltage produced by a galvanic cell is also temperature dependent.

Galvanic corrosion

Galvanic corrosion is a process that degrades metals electrochemically. This corrosion occurs when two dissimilar metals are in contact with each other in the presence of an electrolyte, such as salt water, forming a galvanic cell with H2 formation on the more noble metal. The resulting electrochemical potential then develops an electric current that electrolytically dissolves the less noble material. A concentration cell can be formed if the same metal is exposed to two different concentrations of electrolyte.

Broadband

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Broadband Fixed broadband subscripti...