Adjusting the band gap of CsPbBr3−yXy (X = Cl, I) for optimal interfacial charge transfer and enhanced photocatalytic hydrogen generation

Adjusting the band gap energy of metal halide perovskite by anion exchange (CsPbBr 3− y X y : X = Cl, Br, I) leads to optimal interfacial electron transfer from CsPbBr 3− y X y to TiO 2 , and thus to improved photocatalytic hydrogen generation.