Photocatalytic Anaerobic Oxidation of Aromatic Alcohols Coupled With H Production Over CsPbBr/GO-Pt Catalysts.

Metal halide perovskites (MHPs) have been widely investigated for various photocatalytic applications. However, the dual-functional reaction system integrated selective organic oxidation with H production over MHPs is rarely reported. Here, we demonstrate for the first time the selective oxidation of aromatic alcohols to aldehydes integrated with hydrogen (H) evolution over Pt-decorated CsPbBr. Especially, the functionalization of CsPbBr with graphene oxide (GO) further improves the photoactivity of the perovskite catalyst. The optimal amount of CsPbBr/GO-Pt exhibits an H evolution rate of 1,060 μmol g h along with high selectivity (>99%) for benzyl aldehyde generation (1,050 μmol g h) under visible light ( > 400 nm), which is about five times higher than the CsPbBr-Pt sample. The enhanced activity has been ascribed to two effects induced by the introduction of GO: 1) GO displays a structure-directing role, decreasing the particle size of CsPbBr and 2) GO and Pt act as electron reservoirs, extracting the photogenerated electrons and prohibiting the recombination of the electron-hole pairs. This study opens new avenues to utilize metal halide perovskites as dual-functional photocatalysts to perform selective organic transformations and solar fuel production.