PHOTOCATALYST IMMOBILIZED MATERIAL FOR WATER DECOMPOSITION AND METHOD OF PRODUCING HYDROGEN AND/OR OXYGEN

摘要

PROBLEM TO BE SOLVED: To provide a photocatalyst immobilized material that is free from deterioration of water photolysis performance of a photocatalyst and can be easily and efficiently used, and a method of producing hydrogen and/or oxygen using the photocatalyst immobilized material.SOLUTION: The photocatalyst immobilized material for water decomposition includes a photocatalyst layer on a substrate. The photocatalyst layer includes a visible light-responsive optical semiconductor which is a nitride or an oxynitride containing one or more atoms selected from the group consisting of Ga, Zn, Ti, La, Ta, and Ba, a cocatalyst supported on the visible light-responsive optical semiconductor, and at least one hydrophilic inorganic material selected from the group consisting of silica, alumina, and titanium oxide. In the method of producing hydrogen and/or oxygen, the photocatalyst immobilized material for water decomposition is set in water, and light is radiated to the photocatalyst immobilized material, thereby decomposing the water.