A highly efficient photoelectrochemical H2O2 production reaction with Co3O4 as a co-catalyst.

This communication describes an efficient co-catalyst Co3O4 nanoparticle with a tunable two-electron water oxidation reaction pathway in photoelectrochemical H2O2 production. The photoluminescence measurement explains that the promotion effect is due to the accelerated activation of water to ˙OH. The increased Faraday efficiency of H2O2 for the Co3O4/WO3 sample also verifies that the promotion effect to a two-electron water oxidation reaction of Co3O4 is universal to other semiconductor photoanodes.

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