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Scientists have used sunlight to turn seawater (H2O) into hydrogen peroxide (H2O2), which can then be used in fuel cells to generate electricity. It is the first photocatalytic method of H2O2 production that achieves a high enough efficiency so that the H2O2 can be used in a fuel cell.
The biggest advantage of using liquid H2O2 instead of gaseous hydrogen (H2), as most fuel cells today use, is that the liquid form is much easier to store at high densities.
"In the future, we plan to work on developing a method for the low-cost, large-scale production of H2O2 from seawater," Fukuzumi said. "This may replace the current high-cost production of H2O2 from H2 (from mainly natural gas) and O2."
Read more at: http://phys.org/news/2016-05-electricity-seawater-method-efficiently-hydrogen.html#jCp
Hydrogen peroxide to be used in fuel cells does not seem like a bad idea. It's non-toxic, and if it can be produced using sunlight, it may well have a future.