Hydrogen has reentered the aviation lexicon as governments and industry look for ways to reduce the environmental impact of air transport. While turbine-powered airliners burning liquid hydrogen and generating zero emissions remain a distant dream, there is a nearer-term option: fuel cells. NASA investigated fuel cells for electric propulsion in the mid-2000s, but they were too heavy at 0.3 kW/kg. Now the latest hydrogen fuel cells in cars such as Toyota’s Mirai have specific power ...

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