Oxygen vacancy-rich bismuth oxysulfide(Bi_(2)O_(2)S)with layered structure was prepared for efficient photocatalytic CO_(2) reduction under visible light irradiation.The existence of rich oxygen vacancies in Bi_(2)O_(...Oxygen vacancy-rich bismuth oxysulfide(Bi_(2)O_(2)S)with layered structure was prepared for efficient photocatalytic CO_(2) reduction under visible light irradiation.The existence of rich oxygen vacancies in Bi_(2)O_(2)S,which was proven by sufficient characterization,can provide abundant active sites,improve CO_(2) adsorption and activation abilities and boost the separation efficiency of photogenerated carriers,as determined by theoretical and experimental analyses.As a result,Bi_(2)O_(2)S with rich oxygen vacancies achieves excellent CO_(2) conversion with a CH4 production of 65.8μmol g^(-1) under 90 min of visible light irradiation,which was 27-fold higher than the pristine Bi_(2)O_(2)S.The mechanism of photocatalytic conversion of CO_(2) to CH4 was also determined by in situ FT-IR analyses.This study provides an in-depth understanding of the development of Bi-O-S system photocatalysts through defect engineering for photocatalytic CO_(2) reduction.展开更多
基金supported by the Science and Technology Planning Project of Shenzhen Municipality(JCYJ20200109150225155)the Natural Science Foundation of Hubei Province (2016CFA078)+1 种基金the National Natural Science Foundation of China (51472194 and 21975193)the Fundamental Research Funds for the Central Universities (2020-YB-031)
文摘Oxygen vacancy-rich bismuth oxysulfide(Bi_(2)O_(2)S)with layered structure was prepared for efficient photocatalytic CO_(2) reduction under visible light irradiation.The existence of rich oxygen vacancies in Bi_(2)O_(2)S,which was proven by sufficient characterization,can provide abundant active sites,improve CO_(2) adsorption and activation abilities and boost the separation efficiency of photogenerated carriers,as determined by theoretical and experimental analyses.As a result,Bi_(2)O_(2)S with rich oxygen vacancies achieves excellent CO_(2) conversion with a CH4 production of 65.8μmol g^(-1) under 90 min of visible light irradiation,which was 27-fold higher than the pristine Bi_(2)O_(2)S.The mechanism of photocatalytic conversion of CO_(2) to CH4 was also determined by in situ FT-IR analyses.This study provides an in-depth understanding of the development of Bi-O-S system photocatalysts through defect engineering for photocatalytic CO_(2) reduction.
