The large-scale and renewable production of hydrogen could soon be possible thanks to a new photoelectrochemical device that is driven by concentrated sunlight. When scaled-up, the technology could revolutionize how hydrogen is produced and make the gas a viable alternative to fossil fuels.

Sunlight and water are both in great abundance on Earth so using light to split water molecules to create hydrogen fuel has great potential for creating a clean and renewable energy source. Now mechanical engineers at the Swiss Federal Institute of Technology in Lausanne (EPFL), led by Sophia Haussener, have created an electrochemical device that uses concentrated solar radiation to create hydrogen fuel from water with no undesirable byproducts.

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