Photocatalytic Anaerobic Dehydrogenation of Alcohols over Metal Halide Perovskites: A New Acid-Free Scheme for H 2 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 + , CH 3 NH 3 + (MA), CH(NH 2 ) 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 μmol g -1 h -1 under visible light irradiation (780 nm ≥ λ ≥ 400 nm), which is more than 105-fold higher than pure MAPbBr 3 (30 μmol 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.