Solar energy-harvesting “nanotrees” could produce hydrogen fuel on a mass scale

Solar energy-harvesting “nanotrees” could produce hydrogen fuel on a mass scale:

While hydrogen is considered a “clean” fuel because the only waste product it generates is water, the conventional way to produce it relies on electricity, which is usually produced through the burning of fossil fuels. Researchers at the University of California, San Diego (UCSD), have now developed a “3D branched nanowire array” that they claim could cheaply and cleanly deliver hydrogen fuel on a mass scale...
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