Bi/BiOCl Nanosheets Enriched with Oxygen Vacancies to Enhance Photocatalytic CO_(2)Reduction

摘要

BiOCl has been used in the photoreduction of CO_(2),but exhibits limited photocatalytic activity.In this study,Bi was in situ reduced and deposited on the surface of(001)-dominated BiOCl nanosheets by NaBH 4 to form Bi/BiOCl nanosheets enriched with oxygen vacancies.The as-prepared Bi/BiOCl nanosheets having low thickness(ca.10 nm)showed much higher concentration of oxygen vacancies compared to Bi/BiOCl nanoplates having high thickness(ca.100 nm).Subsequently,the photocatalytic activity of the Bi/BiOCl nanosheets enriched with oxygen vacancies for CO_(2)reduction was dramatically enhanced and much higher than that of BiOCl nanoplates,nanosheets,and Bi/BiOCl nanoplates.It showed that the improved photocatalytic activity in the reduction of CO_(2)can be attributed to the enhanced separation effi ciency of photogenerated electron–hole pairs of the oxygen vacancies on BiOCl nanosheets and Bi metals.This work demonstrated that the in situ reduction of non-noble metals on the surface of BiOCl nanosheets that are enriched with oxygen vacancies is favorable for increasing photocatalytic CO_(2)reduction.