I have a very small PEM (proton exchange membrane) fuel cell from a hydrogen fuel cell science kit I got when I was much younger. I wonder if it is any more efficient at converting water/electricity into H2/O2. You could theoretically just capture the H2 it produces, then feed it back to the PEM fuel cell with the other input being atmospheric (20%) oxygen, and let it do its work to recharge a battery. I'm sure there would be a ton of conversion losses in this process, but maybe you could get 20% or so of energy back that would have been wasted. There are larger PEM materials available for sale but they're pretty expensive. I haven't seen any "medium" sized ones around for sale.
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