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Improvement of water splitting performance of AgTaO 3 (BG 3.4 eV) of a valence-band-controlled photocatalyst was examined. Survey of cocatalysts revealed that a Rh 0.5 Cr 1.5 O 3 cocatalyst was much more effective than Cr 2 O 3 , RuO 2 , NiO and Pt for water splitting into H 2 and O 2 in a stoichiometric amount. The optimum loading amount of the Rh 0.5 Cr 1.5 O 3 cocatalyst was 0.2 wt%. The apparent quantum yield (AQY) at 340 nm of the optimized Rh 0.5 Cr 1.5 O 3 (0.2 wt%)/AgTaO 3 photocatalyst reached to about 40%. Rh 0.5 Cr 1.5 O 3 (0.2 wt%)/AgTaO 3 gave a solar to hydrogen conversion efficiency (STH) of 0.13% for photocatalytic water splitting under simulated sunlight irradiation. Bubbles of gasses evolved by the solar water splitting were visually observed under atmospheric pressure at room temperature.

chemical science

Solar water splitting over Rh0.5Cr1.5O3-loaded AgTaO3 of a valence-band-controlled metal oxide photocatalyst