XAFS study on a photodeposition process of Pt nanoparticles on TiO2 photocatalyst

16th International Conference on X-ray Absorption Fine Structure

Yoshida, T.^1,2 ; Minoura, Y.^3 ; Nakano, Y.^3 ; Yamamoto, M.^3 ; Yagi, S.^1 ; Yoshida, H.^4,5

EcoTopia Science Institute, Nagoya University, Nagoya

464-8603, Japan^1

OCU Advanced Research Institute for Natural Science and Technology, Osaka City University, Osaka

558-8585, Japan^2

Graduate School of Engineering, Nagoya University, Nagoya

464-8603, Japan^3

Kyoto University, Graduate School of Human and Environmental Studies, Kyoto

606-8501, Japan^4

Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto

606-8501, Japan^5

关键词: Ligand exchanges;    Photo-assisted;    Photo-deposition;    Photogenerated electrons;    Pt nanoparticles;    Rapid reduction;    TiO2 photocatalyst;    UV-vis spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012076/pdf
DOI  :  10.1088/1742-6596/712/1/012076

来源: IOP

【 摘 要 】

A photodeposition process of Pt metal particles on anatase TiO2in the aqueous solution of H2PtCl6(precursor) and methanol (reductant) was studied using transmission electron microscopy, UV-vis spectroscopy and X-ray absorption fine structure spectroscopy. These analyses proposed the photodeposition mechanism of Pt on TiO2by the photogenerated electrons: the photo-assisted adsorption of Pt4+complexes on TiO2through the ligand exchange at the initial stage, followed by the successive rapid reduction of Pt4+to Pt0to grow the Pt metal particles, which gives small and almost uniform size of Pt metal nanoparticles.