Synthesis and CO<sub>2</sub> Photoreduction of Lead-Free Cesium Bismuth Halide Perovskite Nanocrystals
Daofu Wu, Xusheng Zhao, Yanyi Huang, Jun’an Lai, Jiayu Yang, Changqing Tian, Peng He, Qiang Huang, Xiaosheng Tang
Abstract
The photoreduction of CO2 into renewable fuels is a promising approach to solve the global energy and environmental crisis. All-inorganic bismuth (Bi) halide perovskite nanocrystals (NCs) have emerged as an appealing photocatalyst for visible-light-driven CO2 reduction, but they still have low photocatalytic activity. Herein, a set of lead-free and stable Cs3Bi2X9 (X = Cl, Cl0.5Br0.5, Br, Br0.5I0.5, I) perovskite NCs were explored for the photocatalytic reduction of CO2 to CO at the gas–solid interface. In all of the recorded perovskite NCs, the as-synthesized Cs3Bi2(Br0.5I0.5)9 showed the highest efficiency of CO2-to-CO conversion producing 54 μmol g–1 of CO yield under visible-light irradiation for 3 h. The strategy we proposed may bring up new opportunities for an efficient photocatalytic CO2 reduction of lead-free perovskite NCs.