Establishment of photocatalyst systems act on the overall splitting of H_2O with high efficiency

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The influences of modifications to Ga_2O_3 and Ba-Ta mixed oxide photocatalysts towards the photocatalytic activity of H-2O splitting are investigated to develop photocatalyst systems which act on the overall splitting of H_2O with high efficiency. As the results, combination of the modifications as the suppression of the reverse reaction of the intermediates over the photocatalyst surfaces by the combination of effective co-catalyst, the suppression of the recombination of photo-produced electron and hole in the bulk of photocatalyst by controlling the bulk states by the addition of metal ions, and controlling the morphology by changing the preparation condition makes the photocatalytic activity improved remarkably, where the quantum yields shows more than 50%. Moreover, we also show that the quantum yield of photocatalytic H_2O splitting depends on the photon density of the irradiated light. On the basis of the result, we try to improve the photocatalytic performance on titanium mixed oxide photocatalysts.