There is a drive to displace fossil fuels in power generation and transport with sustainable alternatives. One approach that has been discussed over the last few decades is a future zero-carbon, hydrogen economy wherein hydrogen is generated from renewables and used to feed fuel cells in cars. Fuel cells are essentially electrical batteries that can be fed chemical energy continuously to generate electricity. Unfortunately, hydrogen gas is a hazardous substance and so safe storage in a fuel tank in such a vehicle has been a roadblock to advances in this area.
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Source: Phys.org