Scientists at the University of Cambridge, UK, have developed a device that can make fuel from sunlight, carbon dioxide and water. The device is created out of a sheet that is made of cobalt and semiconductor powders. These are both photocatalysts, which means they absorb light and use it in chemical reactions. When the sheet is placed in water and carbon dioxide and then exposed to sunlight, a chemical reaction similar to photosynthesis takes place, converting sunlight into formic acid and oxygen. Formic acid can be turned into hydrogen fuel or stored and used as fuel later.
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