Sonochemical Fabrication of s‐Scheme Hierarchical CdS/BiOBr Heterojunction Photocatalyst with High Performance for Carbon Dioxide Reduction

Abstract CO 2 conversion to methanol becomes a promising strategy by using semiconductor‐based photocatalyst for environmental remediation and converting solar energy. In this study, a series of CdS‐modified BiOBr (CdS/BiOBr) microspheres are fabricated by mild hydrolysis‐ultrasonic method and the effect of CdS growing on the photocatalytic CO 2 reduction activities of BiOBr are systematically investigated. Among all CdS/BiOBr composite photocatalysis, the highest value of CH 3 OH yields (876 µmol g cat −1 , 4 h) is achieved with 15% CdS/BiOBr, which is nearly double higher than alone BiOBr (435 µmol g cat −1 ). Comparatively, the CdS/BiOBr microspheres with s‐scheme heterostructure exhibit the surprising photocatalytic performance and CH 3 OH selectivity, which are attributed to the enhanced light absorption, as well as effective separation and migration of the photoinduced electron–hole pairs induced by the s‐scheme heterojunction between BiOBr and CdS. This study provides a mild hydrolysis‐ultrasonic method for environmental remediation and converting energy using cost‐effective semiconductor materials.