Volume 133, Issue 11 pp. 6225-6234
Forschungsartikel

Site Sensitivity of Interfacial Charge Transfer and Photocatalytic Efficiency in Photocatalysis: Methanol Oxidation on Anatase TiO2 Nanocrystals

Cong Fu

Cong Fu

Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Heifei, 230026 P. R. China

These authors contributed equally to this work.

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Fei Li

Fei Li

Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237 P. R. China

These authors contributed equally to this work.

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Jiachen Zhang

Jiachen Zhang

Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Heifei, 230026 P. R. China

These authors contributed equally to this work.

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Dan Li

Dan Li

Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Heifei, 230026 P. R. China

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Kun Qian

Kun Qian

Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Heifei, 230026 P. R. China

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Yong Liu

Yong Liu

State Key Laboratory of Catalysis, Dalian Institute of, Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P. R. China

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Prof. Junwang Tang

Prof. Junwang Tang

Department of Chemical Engineering, University College London, London, WC1E 7JE UK

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Prof. Fengtao Fan

Prof. Fengtao Fan

State Key Laboratory of Catalysis, Dalian Institute of, Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P. R. China

Dalian National Laboratory for Clean Energy, Dalian, 116023 P. R. China

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Prof. Qun Zhang

Corresponding Author

Prof. Qun Zhang

Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Heifei, 230026 P. R. China

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Prof. Xue-Qing Gong

Corresponding Author

Prof. Xue-Qing Gong

Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai, 200237 P. R. China

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Prof. Weixin Huang

Corresponding Author

Prof. Weixin Huang

Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Heifei, 230026 P. R. China

Dalian National Laboratory for Clean Energy, Dalian, 116023 P. R. China

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First published: 07 December 2020
Citations: 6

Abstract

Photocatalytic oxidation of methanol on various anatase TiO2 nanocrystals was studied by in situ and time-resolved characterizations and DFT calculations. Surface site and resulting surface adsorbates affect the surface band bending/bulk-to-surface charge migration processes and interfacial electronic structure/interfacial charge transfer processes. TiO2 nanocrystals predominantly enclosed by the {001} facets expose a high density of reactive fourfold-coordinated Ti sites (Ti4c) at which CH3OH molecules dissociate to form the CH3O adsorbate (CH3O(a)Ti4c). CH3O(a)Ti4c localized density of states are almost at the valence band maximum of TiO2 surface, facilitating the interfacial hole transfer process; CH3O(a)Ti4c with a high coverage promotes upward surface band bending, facilitating bulk-to-surface hole migration. CH3O(a)Ti4c exhibits the highest photocatalytic oxidation rate constant. TiO2 nanocrystals enclosed by the {001} facets are most active in photocatalytic methanol oxidation.

Conflict of interest

The authors declare no conflict of interest.

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