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.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films