光催化
异质结
水蒸气
材料科学
催化作用
还原(数学)
化学工程
光电子学
化学
工程类
几何学
数学
生物化学
有机化学
作者
Xiaoning Wang,Zhilin Jiang,Haowen Chen,Kang Wang,Xitao Wang
标识
DOI:10.1016/j.jallcom.2021.163030
摘要
A ternary Z-scheme Ag-Cu2O/TiO2 catalyst was prepared by one-step chemical reduction method which was applied in photocatalytic CO2 reduction with water vapor under simulated sunlight in a recirculation reactor. The structure, morphology, photo absorption capacity and optoelectronic properties of the obtained samples were characterized by XRD, TEM, XPS, UV–vis DRS and Photoelectrochemical measurements. The photocatalytic activity tests showed that 0.5Ag-0.5Cu2O/TiO2 exhibited the highest production rate of CO (13.19 μmol/g/h) and CH4 (1.74 μmol/g/h) under simulated sunlight when compared to P25, 1Cu2O/TiO2 and 1Ag/TiO2. Mechanism studies by means of EPR technology testified that the improvement of photocatalytic performance was mainly due to the formation of Z-scheme heterojunctions between P25 and Cu2O, which facilitated the separation of photogenerated charges. The incorporation of Ag nanoparticles further enhanced the transfer of photogenerated carriers and the absorption of visible light, thus preventing the self-reduction of Cu2O and improving the photocatalytic CO2 reduction performance.
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