Composite of CsPbBr3 with Boron Imidazolate Frameworks as an Efficient Visible-Light Photocatalyst for CO2 Reduction

Improving the stability and charge transportation efficiency of lead halide perovskites is the key for their practical photocatalytic applications. Herein, we designed and synthesized a microporous boron imidazolate framework (BIF-122-Co) by cross-linking boron imidazolate ligands and benzene carboxylate with metal ions, which was further used as a host matrix to encapsulate CsPbBr3 perovskite via a sequential deposition route to obtain a composite material, CsPbBr3/BIF-122-Co. Due to the intimate host–guest interfacial contact in the composite material, BIF-122-Co not only provided a physical protective barrier for CsPbBr3 but also accelerated the photoinduced charge separation process in the photocatalytic CO2 reduction reaction. The work provided a guide for exploration of excellent perovskite/metal–organic framework (MOF) composites.