Splitting seawater could provide an endless source of green hydrogen

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https://www.science.org/content/article/splitting-seawater-provide-endless-source-green-hydrogen

By Robert F. Service, Science. 

Excerpt: ...“Green” hydrogen, made by using renewable energy to split water molecules, could power heavy vehicles and decarbonize industries such as steelmaking without spewing a whiff of carbon dioxide. But because the water-splitting machines, or electrolyzers, are designed to work with pure water, scaling up green hydrogen could exacerbate global freshwater shortages. Now, several research teams are reporting advances in producing hydrogen directly from seawater, which could become an inexhaustible source of green hydrogen. ...Md Kibria, a materials chemist at the University of Calgary, says for now there’s a cheaper solution: feeding seawater into desalination setups that can remove the salt before the water flows to conventional electrolyzers. ...Today, nearly all hydrogen is made by breaking apart methane, burning fossil fuels to generate the needed heat and pressure. Both steps release carbon dioxide. Green hydrogen could replace this dirty hydrogen, but at the moment it costs more than twice as much, roughly $5 per kilogram. That’s partly due to the high cost of electrolyzers, which rely on catalysts made from precious metals. The U.S. Department of Energy recently launched a decadelong effort to improve electrolyzers and bring the cost of green hydrogen down to $1 per kilogram....

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