The sun provides enough energy in an hour to meet the world's demands for a year, yet solar energy accounts for barely 1% of global power consumption. Plenty of researchers are working on making solar cells turn sunlight into electricity more efficiently. Some, though, are trying instead to turn it into fuel, using so-called photo-electrochemical (pec) cells. Unfortunately, most processes designed to do this have proved complex and inefficient. But Flo-rent Boudoire and Artur Braun of the Swiss Federal Laboratories for Materials Science and Technology think they have found a way to improve things.
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