Fig. 5. Photocatalytic solar water splitting over Rh0.5Cr1.5O3(0.2 wt%)/AgTaO3. AgTaO3 was synthesized by a solid state reaction at 1273 K for 15 h without excess Ag. Rh0.5Cr1.5O3 was loaded by an impregnation method at 623 K for 1 h. Rh0.5Cr1.5O3(0.2 wt%)/AgTaO3 was activated by a 300 W Xe-arc lamp in distilled water for 20 h before this reaction (Fig. 1) in order to eliminate the induction period early. Photocatalyst: 0.3 g, reactant solution: distilled water (120 mL), cell: top-irradiation cell with a Pyrex window, light source: a solar simulator with an AM1.5-filter (100 mW cm–2), irradiation area: 25 cm2.
