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Fuel cell
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For other uses, see Fuel cell (disambiguation).
Demonstration model of a direct-methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image
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In 2002, typical cells had a catalyst content of US$1000 per kilowatt of electric power output.
Energy cells are not constrained by the maximum Carnot cycle efficiency as combustion engines are.
The overall efficiency (electricity to hydrogen and back to electricity) of such plants (known as round-trip efficiency) is between 30 and 50%, depending on conditions