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Fuel cells

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Where could I go to find a realistic efficiency of a hydrogen fuel cell, and of electrolysis? I want to find out how much energy would be lost if I were to use electrolysis to fuel a hydrogen fuel cell, assuming that I was feeding the electricity from the fuel cell back into the electrolysis. I've found this site:

Electrolysis of Water and Fuel Cell Operation

but it seems like it only details theoretically perfect fuel cells, rather than real world energy losses.

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