VISIBLE LIGHT-RESPONSIVE PHOTOCATALYST, AND HYDROGEN GENERATION DEVICE AND ENERGY SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a visible light-responsive photocatalyst enabling use of the light having a wavelength band longer than 640 nm, and also to provide a hydrogen generation device and an energy system using the photocatalyst.SOLUTION: The visible light-responsive photocatalyst has a composition represented by a general formula: BaBiInO(wherein x satisfies 0x0.3). The hydrogen generation device is provided with: the above visible light-responsive photocatalyst (for example, a photoelectrode 70 with the photocatalyst); an electrolyte 74 contacting the photocatalyst and including water; and a housing 73 for housing the photocatalyst and the electrolyte. By irradiating the photocatalyst with light, water is decomposed to generate hydrogen. The energy system includes: the above hydrogen generation device; a fuel cell; and a line for supplying hydrogen generated by the hydrogen generation device to the fuel cell.