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In order to expand the effective wavelength of TiO₂ particulate photocatalyst into the visible region, Ru-doped TiO₂ particles were prepared and their properties as the photocatalyst were investigated. With this photocatalyst, the oxygen evolution reaction occurred by irradiation of visible light at wavelengths longer than 440nm using iron(III) ions as the electron acceptor. To clarify the mechanistic aspects of the effect of Ru-doping, photoelectrochemical properties of Ru-doped TiO₂ sinter electrodes were investigated.