Applied Catalysis2022，Vol.30511.DOI:10.1016/j.apcatb.2021.121026

Surface oxygen vacancy and graphene quantum dots co-modified Bi2WO6 toward highly efficient photocatalytic reduction of CO2

Xiong S. Bao S. Wang W. Liu P. Huang Y. Duan Z. Lv Y. Hao J. Mao Y. Ouyang D.
Applied Catalysis2022，Vol.30511.DOI:10.1016/j.apcatb.2021.121026
✕
  • NSTL
  • Elsevier

Surface oxygen vacancy and graphene quantum dots co-modified Bi2WO6 toward highly efficient photocatalytic reduction of CO2

Xiong S. 1Bao S. 1Wang W. 1Liu P. 1Huang Y. 1Duan Z. 1Lv Y. 1Hao J. 2Mao Y. 3Ouyang D.4
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作者信息

  • 1. College of Chemical Engineering Xiangtan University
  • 2. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia University
  • 3. Joint International Center for Carbon-dioxide Capture and Storage (iCCS) Advanced Catalytic Engineering Research Center of the Ministry of Education College of Chemistry and Chemical Engineering Hunan University
  • 4. Xiangtan Sepiolite Technology Co. Ltd
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Abstract

? 2021 Elsevier B.V.Weak light-harvesting capability and low electron-hole separation efficiency remain significant problems unresolved in the design of high-efficient photocatalyst. This work designed and prepared a surface oxygen vacancy (Vo) and graphene quantum dots (GQDs) co-modified Bi2WO6 (GQDs/BWO6?x). It exhibited enhanced photocatalytic conversion of CO2 to CO with a yield of 43.9 μmol·g?1·h?1, which is 1.7-fold higher than Bi2WO6 (BWO). The photogenerated electrons over GQDs/BWO6?x had a longer average fluorescence lifetime (3.3 ns) than BWO (2.7 ns), implying a high electron-hole separation efficiency. The DFT calculation results revealed that the electrons in GQDs/BWO6?x flow from the Vo-remote atoms to the Vo-neighboring atoms instead of confining in the GQDs molecules. Easy transformation of *COOH to *CO, a rate-limiting step, was suggested by an energy barrier calculation result (0.16 eV for GQDs/BWO6?x, 1.12 eV for BWO).

Key words

Bi2WO6/CO2 conversion/Graphene quantum dots/Oxygen vacancy

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出版年

2022
Applied Catalysis

Applied Catalysis

ISSN：0926-3373
被引量39
参考文献量32
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