Seems like something's missing here.

The aluminum-oxygen reaction gives you about 3000 WH/Lb, which I did
in a test cell back in college. I remember that being very close to
the energy required to turn aluminum ore into aluminum. No surprise,
as it's splitting off the oxygen from the aluminum. If you're
splitting water with it, then you net hydrogen, but don't you end up
with something less in terms of net yield?
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