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(A) Photoelectrochemical overall water splitting and (B) stability of photocurrent using BiVO4 thin film electrode and SrTiO3∶Rh photocatalyst electrode under visible light irradiation. Dashed line: the half of the amount of electron, open square: the rate of H2 evolution. Electrolyte, 0.1 mmol L-1 of an aqueous K2SO4 solution; applied voltage, 0 V; electrode area, 4 cm2 each; light source, 300 W Xe-lamp with a cut-off filter (λ > 420 nm).
