Incorporation of Cesium Lead Halide Perovskites into g-C(3)N(4) for Photocatalytic CO(2) Reduction

[Image: see text] CsPbBr(3) perovskite-based composites so far have been synthesized by postdeposition of CsPbBr(3) on a parent material. However, in situ construction offers enhanced surface contact, better activity, and improved stability. Instead of applying a typical thermal condensation at highly elevated temperatures, we report for the first time CsPb(Br(x)Cl(1–x))(3)/graphitic-C(3)N(4) (CsPbX(3)/g-C(3)N(4)) composites synthesized by a simple and mild solvothermal route, with enhanced efficacy in visible-light-driven photocatalytic CO(2) reduction. The composite exhibited a CO production rate of 28.5 μmol g(–1) h(–1) at an optimized loading amount of g-C(3)N(4). This rate is about five times those of pure g-C(3)N(4) and CsPbBr(3). This work reports a new in situ approach for constructing perovskite-based heterostructure photocatalysts with enhanced light-harvesting ability and improved solar energy conversion efficiency.