*Article* **E**ffi**cient Photocatalytic CO2 Reduction with MIL-100(Fe)-CsPbBr3 Composites**

#### **Ruolin Cheng 1, Elke Debroye 1, Johan Hofkens 1,\* and Maarten B. J. Roe**ff**aers 2,\***


Received: 4 November 2020; Accepted: 18 November 2020; Published: 20 November 2020

**Abstract:** Bromide-based metal halide perovskites (MHPs) are promising photocatalysts with strong blue-green light absorption. Composite photocatalysts of MHPs with MIL-100(Fe), as a powerful photocatalyst itself, have been investigated to extend the responsiveness towards red light. The composites, with a high specific surface area, display an enhanced solar light response, and the improved charge carrier separation in the heterojunctions is employed to maximize the photocatalytic performance. Optimization of the relative composition, with the formation of a dual-phase CsPbBr3 to CsPb2Br5 perovskite composite, shows an excellent photocatalytic performance with 20.4 μmol CO produced per gram of photocatalyst during one hour of visible light irradiation.

**Keywords:** metal halide perovskites; metal-organic framework; photocatalysis
