The study on enhancement effect of photocatalytsis under visible light irradiation with the oxide photocatalysts

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Since photo-induced decomposition of water on TiO_2 electrodes was discovered, semiconductor-based photocatalysis has attracted extensive interest. Most of the investigations have focused on TiO_2, which shows relatively high activity and chemical stability under UV light irradiation. Therefore, there is an urgent need to develop new types of photocatalysts that can yield high activity under visible light irradiation, because the attempt is aimed at producing hydrogen of clean-energy from water utilizing solar energy. We have investigated the electric and crystal structural changes on the oxide photocatalysts, resulting in a change in photocatalytLc property. The results are explained in the following.1.In addition to the reported InTaO_4 and InNbO_4 photocatalysts, 3d transition metal V compound InVO_4 was found to be a visible light driven photocatalyst for H_2 evolution from pure water. Then, we have also investigated the substitute system MVO_4 under high pressure. We found the phase transition in CeVO_4 up to 6 GPa.2.We have demonstrated efficiently photocatalytic degradation of methylene blue dye over the oxide photocatalyst R_2BaCuO_5(R=lanthanoid) under visible light irradiation. Nd_2BaCuO_5 oxide was found the high activity under visible light irradiation.3.We have found superconductivity in the Pr_2Ba_4Cu_7O_<15-δ> possessing metallic double chains when the oxide photocatalysts were searched.