In-situ FT-IR study on the mechanism of CO2 reduction with water over metal (Ag or Au) loaded Ga2O3 photocatalysts e-j

• Yamamoto Muneaki

  Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

• Yoshida Tomoko

  EcoTopia Science Institute, Nagoya University

• Yamamoto Naoto

  Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

• Yoshida Hisao

  Graduate School of Human and Environmental Studies, Kyoto University

• Yagi Shinya

  EcoTopia Science Institute, Nagoya University

書誌事項

タイトル別名

• In-Situ FT-IR Study on the Mechanism of CO₂Reduction with Water over Metal (Ag or Au) Loaded Ga₂O₃Photocatalysts
• In-situ FT-IR study on the mechanism of CO2 reduction with water over metal (Ag or Au) loaded Ga2O3 photocatalysts

抄録

Ag loaded Ga₂O₃ (Ag/Ga₂O₃) has exhibited photocatalytic activity for CO₂ reduction with water to produce CO as well as for water splitting to H₂ and O₂. In-situ FT-IR measurements have shown CO₃ stretching vibration bands assignable to carbonate and bicarbonate species when CO₂ molecules chemisorbed on the catalyst surface. These species change to bidentate formate species under photoirradiation. It subsequently converts to CO by interacting with water molecules, not chemisorbed OH on the catalyst surface. This result suggests that formate species is an intermediate of the photocatalytic CO₂ reduction. On the other hand, Au loaded Ga₂O₃ (Au/Ga₂O₃) has produced H₂ predominantly with a very small amount of CO formation, since the less amount of CO₂ molecules chemisorb on Au/Ga₂O₃. FT-IR measurements of the Ag/Ga₂O₃ with high Ag loading have shown carbonate species due to the adsorption of atmospheric CO₂ on hydroxyl group. The carbonate species is too unstable under photoirradiation to convert into formate species, but is stabilized as CO₃^2- species by the reaction with water. XANES analysis has revealed that atomically dispersed Ag metal species may be effective for the adsorption of CO₂ and the subsequent conversion into formate species to promote the photocatalytic CO₂ reduction. [DOI: 10.1380/ejssnt.2014.299]

収録刊行物

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 12 (0), 299-303, 2014

  公益社団法人 日本表面真空学会

キーワード

• Infrared absorption spectroscopy
• X-ray absorption near edge structure (XANES)
• Surface chemical reaction
• Photocatalysis
• Carbon dioxide
• Water

詳細情報

• CRID: 1390282680163461120
• NII論文ID: 130004933816
• DOI: 10.1380/ejssnt.2014.299
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/12/0/12_299/_pdf
• 本文言語コード: en
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