This artificial leaf produces fuel from carbon dioxide, water and sunlight, just like a real leaf – and it’s light enough to float on water
at the University of Cambridge and his colleagues developed a solar fuel cell made from lead perovskite, a kind of crystal that can capture energy from light. The cell produces bubbles of hydrogen and carbon monoxide, which can be mixed together to make a fuel called syngas.“It’s a first of its kind for solar fuel,” says Reisner.
The prototype device is a square about 10 centimetres wide and a millimetre thick. In tests on the river Cam in Cambridge, it produced hydrogen with an efficiency of 0.58 per cent and carbon monoxide with an efficiency of 0.0053 per cent. When compared on a gram for gram basis, it is similar to current solar fuel technologies and even some plants, says Reisner.
The fabrication process, which involves depositing a thin film of perovskite on indium and tin-coated polyester, is easily scalable, says Reisner, but there are still some problems. The efficiency needs to be closer to 10 per cent for commercial applications, and the materials used in the prototype could be potentially toxic to waterways, even though they are contained in the device.
Reisner and his team have yet to design a method to collect the gas bubbles from the device, but they hope that the leaf will serve as a proof of concept for commercial devices.
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