2018年9月
Development of Rh-Doped Ga2O3 Photocatalysts for Reduction of CO2 by H2O as an Electron Donor at a More than 300 nm Wavelength
JOURNAL OF PHYSICAL CHEMISTRY C
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- 巻
- 122
- 号
- 37
- 開始ページ
- 21132
- 終了ページ
- 21139
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.jpcc.8b04956
- 出版者・発行元
- AMER CHEMICAL SOC
Rhodium-doped gallium oxide (Ga2O3:Rh) that was prepared by a simple coprecipitation method exhibited activity for the photocatalytic conversion of CO2 by H2O under photoirradiation with light of >300 nm wavelength. Although Ga2O3 is a wide-band-gap photocatalyst that is active only under photoirradiation with <300 nm light, the absorption edge shifted to >300 nm as a result of Rh doping. Ag-Cr-loaded Ga2O3:Rh (0.7 mol %) showed activity for the production of CO (3.9 mu mol h(-1)) as a reduction product of CO,. The formation of a stoichiometric amount of O-2 indicated that H2O acts as an electron donor for the photocatalytic conversion of CO2. Characterization using several techniques such as X-ray absorption spectroscopy (XAS) revealed that after doping in Ga2O3 the trivalent Rh species substituted not for the tetrahedral Ga site but for the octahedral Ga site of beta-Ga2O3. From the result of DFT calculations, the new energy level owing to Rh3+ was within the Ga2O3 band gap. It was concluded that the new absorption due to the Rh d t(2g) orbital to the conduction band contributed to the activity of photocatalytic conversion of CO2 by H2O under photoirradiation with light of >300 nm wavelength.
- リンク情報
- ID情報
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- DOI : 10.1021/acs.jpcc.8b04956
- ISSN : 1932-7447
- Web of Science ID : WOS:000445711100006