Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (3): 256-263.DOI: 10.11944/j.issn.1000-0518.2020.03.190265

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Research Progress in Photocatalytic Reduction of CO2 Enhanced by Oxygen Vacancy

GUO Hongxia(),CUI Jifang,LIU Li   

  1. Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials,College of Chemical Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China
  • Received:2019-10-10 Accepted:2019-12-25 Published:2020-03-01 Online:2020-03-10
  • Contact: GUO Hongxia
  • Supported by:
    Supported by the National Natural Science Young Foundation of China(No.21908052)


The photocatalytic reduction reactions can directly convert carbon dioxide (CO2) into hydrocarbon solar fuels utilizing the endless solar energy and semiconductor photocatalysts, which can solve the greenhouse effect, global warming, environmental pollution, and energy crisis, therefore it has become the ideal way nowadays. The mechanism of photocatalytic reduction of CO2 enhanced by oxygen vacancy and the photocatalytic systems with C1 and C2 components as reduction products were summarized in this paper. The first step in the CO2 photoreduction (i.e. the formation of CO2·- anionic radical by capturing an electron from the conduction band of a photocatalyst) was considered to be the rate-limiting step. The introduction of oxygen vacancy and induced coordinately unsaturated metal atoms sites could strengthen the electron capture from CO2 to CO2·-, thereby promoting the photocatalytic CO2 reduction. The existential problems in the process of photocatalytic reduction of CO2 enhanced by oxygen vacancy were explained objectively, and the development prospects were put forward.

Key words: photocatalysis, CO2 reduction, oxygen vacancy, mechanism