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Would it be better to just use the original 100BTU electrical energy to power the vehicle directly instead of using it to create hydrogen ( energy carrier by itself ) with less output of BTU ?
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Don't forget that fuel cells are more energy efficent than electric motors.
You also lose energy by storing it in batteries.
Lastly batteries (the kind we use at the moment) need lithium and there not that much lithium available if you want to make all cars run on it.
Technology that need scarce materials have problems to scale be it platinum or lithium.
Maybe the
air car could also be the winning techonology.
It's difficult to forcast the future, because we don't know what will be invented next.