Synthesis of monodisperse water-stable surface Pb-rich CsPbCl<sub>3</sub> nanocrystals for efficient photocatalytic CO<sub>2</sub> reduction
Jingrun Zhu, Yihua Zhu, Jianfei Huang, Lu Hou, Jianhua Shen, Chunzhong Li
Abstract
Surface Pb-rich lead halide (CsPbCl3) perovskite nanocrystals (NCs) with high stability and monodispersity in water have been synthesized using a general and convenient liquid-solid interpenetration (LSI) method. In this process, water molecules permeate into the solid CsPbCl3 NC layers and slowly dissolve the Cs+ and Cl- ions on the surface of CsPbCl3 NCs. The Cs+ and Cl- ions in water inhibit the decomposition rate of CsPbCl3 NCs, inducing surface Pb-rich layers. The surface Pb-rich structure increases the photoluminescence (PL) lifetimes and improves the photocatalytic performances of lead halide perovskite NCs. Under simulated solar irradiation, the largest rate of CO2 photoreduction from surface Pb-rich Ni-doped CsPbCl3 NCs reaches up to 169.37 μmol g-1 h-1. This study provides an effective general strategy to design stable lead halide perovskite quantum dots (QDs) for their wide applications.