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

Photocatalytic H 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 evolution using MHPs is highly desired. Here, we investigate the photocatalytic anaerobic dehydrogenation of alcohols over a series of MHPs (APbX, A = Cs, CHNH (MA), CH(NH) (FA); X = Cl, Br, I) to simultaneously produce H and aldehydes. Via the coassembly of Pt and rGO nanosheets on MAPbBr microcrystals, the optimal MAPbBr/rGO-Pt reaches a H evolution rate of 3150 μmol g h under visible light irradiation (780 nm ≥ λ ≥ 400 nm), which is more than 105-fold higher than pure MAPbBr (30 μmol g h). The present work not only brings new ample opportunities toward photocatalytic H evolution but also opens up new avenues for more effective utilization of MHPs in photocatalysis.