Photocatalytic Anaerobic Dehydrogenation of Alcohols over Metal Halide Perovskites: A New Acid-Free Scheme for H2 Production

Photocatalytic H-2 evolution from haloid acid (HX) solution by metal halide perovskites (MHPs) has been intensively investigated; however, the corrosive acid solution severely restricts its practical operability. Therefore, developing acid-free schemes for H-2 evolution using MHPs is highly desired. Here, we investigate the photocatalytic anaerobic dehydrogenation of alcohols over a series of MHPs (APbX(3), A = Cs+, CH3NH3+ (MA), CH(NH2)(2)(+) (FA); X = Cl-, Br-, I-) to simultaneously produce H-2 and aldehydes. Via the coassembly of Pt and rGO nanosheets on MAPbBr(3) microcrystals, the optimal MAPbBr(3)/rGO-Pt reaches a H-2 evolution rate of 3150 mu mol g(-1) h(-1) under visible light irradiation (780 nm >= lambda >= 400 nm), which is more than 105-fold higher than pure MAPbBr(3) (30 mu mol g(-1) h(-1)). The present work not only brings new ample opportunities toward photocatalytic H-2 evolution but also opens up new avenues for more effective utilization of MHPs in photocatalysis.