In the past few years there has been intensive research focused on doping TiO 2 with other metal oxides in order to synthesize a mixed metal oxide based semiconductor with modified band gap which can split water efficiently in visible light. In this study we modified titania–anatase powders through deposition of ceria nanoparticles on them. The formation of a mixed metal oxide at the CeO x /TiO 2 interface was observed using transmission electron microscopy and near-edge X-ray absorption spectroscopy. UV–vis spectra show that this mixed metal oxide can absorb photons in the visible region due to the presence of stabilized Ce 3+ in the mixed oxide phase. The addition of 0.5 wt % Pt imposes a significant chemical change on the ceria nanoparticles by substantially enhancing the concentration of Ce 3+ and makes possible photocatalytic activity by providing an electron trap. When irradiated with visible light, 0.5 wt % Pt loaded on CeO 2 -modified TiO 2 generates oxygen almost seven times more efficiently than a standard WO 3 catalyst. A correlation was found between the concentration of Ce 3+ in Pt/CeO x /TiO 2 and its photocatalytic activity.
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Kundu et al. (2012) studied this question.
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