Masato Kasuga
Photocatalytic Reduction of Carbon Dioxide in Water by Pt Loaded Lanthanide Oxide Modified Ceria Photocatalysts
Kazunori Sato
Carbon dioxide reduction to produce useful products is an important topic from the viewpoint of environmental and energy issues. Several semiconductors have been reported to be effective photocatalysts for CO2 reduction. For example, it has been reported that Pt loaded SrTiO3 photocatalyst gives CH4 from CO2 reduction[1]. In our previous research, gadolinia-modified ceria photocatalysts have high photocatalytic activity for the removal of lead (II) ions from aqueous solutions[2]. We therefore focused on using Pt loaded lanthanide oxide modified ceria as efficient photocatalysts for CO2 reduction. Lanthanide oxide modified ceria particles were prepared by a solid-state reaction method or co-prepicitation method, and Pt cocatalyst was loaded by photoelectrodeposition. The Pt loaded photocatalysts were used for CO2 photocatalytic reduction, and the photocatalysts prepared by the solid-state reaction method showed higher photocatalytic activities for CO2 reduction to form CH4 than that prepared by the co-prepicitation method. The solid solution LnxCe1-xOy (Ln = La, Gd) phase coexisting with the CeO2 matrix phase showed a high ability of CO2 photocatalytic reduction, compared to the single phase Ln0.05Ce0.95O1.975. The high photocatalytic activity can be caused by a formation of heterojunctions between the p-type LnxCe1-xOy and n-type CeO2, promoting a transfer of photogenerated electron-hole pairs and efficient retardation of the charge recombination
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