光催化
还原(数学)
氧气
空位缺陷
材料科学
调解
氧还原
化学
化学工程
结晶学
催化作用
物理化学
政治学
电化学
生物化学
几何学
数学
有机化学
电极
法学
工程类
作者
Qiong Liu,Chunli Bai,Di He,Xia Wu,Yiping Wu,Rong Chen
标识
DOI:10.1016/j.jece.2024.112449
摘要
Surface defects in semiconductors play a significant role in modulating the performance of photocatalytic reactions. However, there is still insufficient exploration regarding the influence of defects on the photocatalytic CO2 reduction performance. In this study, we achieved controllable construction of oxygen vacancies (OVs) in BiOX (X=Cl, Br) samples through one-step solvothermal treatment in polyols by adjusting the reaction time. The introduction of OVs significantly enhanced the photocatalytic activity of BiOX (X=Cl, Br) for converting CO2 to CO. Among all the tested BiOX (X=Cl, Br) samples with OVs, BiOCl-OV-2 and BiOBr-OV-2 samples with a moderate amount of OVs exhibited the highest CO yield of 28.51 and 15.22 μmol gcat-1 after 4 hours of irradiation, respectively. Photo-/electrochemical measurements results revealed that engineering OVs into BiOX (X=Cl, Br) effectively adjusted their electronic structure, charge density and separation; however, excessive OVs may slightly degrade their photoelectrochemical properties and thus lead to reduced photocatalytic activity. Furthermore, an appropriate amount of OV was found to enhance both CO2 adsorption capacity and photo-generated electron reduction ability, thereby further promoting the overall efficiency of photocatalytic CO2 conversion. Through in situ FTIR spectra analysis, we uncovered the process of photocatalytic conversion from CO2 to CO.
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