Morphology and structure of lead‐free CuSb‐based double perovskites for photocatalytic CO<sub>2</sub> reduction
Daofu Wu, Changqing Tian, Jingchen Zhou, Yanyi Huang, Jun’an Lai, Bo Gao, Peng He, Qiang Huang, Xiaosheng Tang
Abstract
Abstract Lead‐free halide double perovskites (DPs) have attracted great attention due to their stability, nontoxicity, and good photophysical properties. Herein, environmentally friendly small‐bandgap Cs 2 CuSbCl 6 and Cs 4 CuSb 2 Cl 12 DPs microcrystals (MCs) are prepared via a solvent synthesis technique. This study also reports a bottom‐up synthetic protocol for obtaining evenly distributed Cs 2 CuSbCl 6 and Cs 4 CuSb 2 Cl 12 quantum dots (QDs) utilizing a modified hot injection approach. These MCs and QDs have strong absorption throughout the visible region, indicating that they could be promising light‐absorbing materials as sunlight‐driven photocatalysts. For the first time, the efficient sunlight‐driven photocatalytic CO 2 reduction activity of these Pb‐free “green” MCs and QDs has been revealed, and a product yield of 307 μmol g −1 and an electron consumption of 1053 μmol g −1 are achieved by the Cs 4 CuSb 2 Cl 12 QDs under 3 h irradiation. Our results highlight the potential of this family of materials for photocatalytic applications.