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View Diary: Recent DOE Break-Through with Hydrogen Fuel Cells, should make them Affordable (275 comments)

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  •  Yes, a battery (2+ / 0-)
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    OtherDoug, Odysseus

    It's not even a metaphor.  Batteries work by changing chemistry which releases energy.  Fuel cells do pretty much the same thing but inject the ions directly, rather than storing them in changing chemistry.  Batteries release hydrogen when overcharged.

    Fuel cells might make some sense when combined with the reformer, which breaks down a fuel into hydrogen and whatever else.  So there are natural gas fuel cells, which are a nice alternative to moving-part generators.  Reformers, though, tend to require catalysts and very high operating temperatures, limiting their applicability.

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