Glycine‐Functionalized CsPbBr<sub>3</sub> Nanocrystals for Efficient Visible‐Light Photocatalysis of CO<sub>2</sub> Reduction
Ying Xu, Wen Zhang, Ke Su, You‐Xiang Feng, Yanfei Mu, Min Zhang, Tong‐Bu Lu
Abstract
Abstract Capping ligands are indispensable for the preparation of metal‐halide‐perovskite (MHP) nanocrystals (NCs) with good stability; however, the long alkyl‐chain capping ligands in conventional MHP NCs will be unfavorable for CO 2 adsorption and hinder the efficient carrier separation on the surface of MHP NCs, leading to inferior catalytic activity in artificial photosynthesis. Herein, CsPbBr 3 nanocrystals with short‐chain glycine as ligand are constructed through a facile ligand‐exchange strategy. Owing to the reduced hindrance of glycine and the presence of the amine group in glycine, the photogenerated carrier separation and CO 2 uptake capacity are noticeably improved without compromising the stability of the MHP NCs. The CsPbBr 3 nanocrystals with glycine ligands exhibit a significantly increased yield of 27.7 μmol g −1 h −1 for photocatalytic CO 2 ‐to‐CO conversion without any organic sacrificial reagents, which is over five times higher than that of control CsPbBr 3 NCs with conventional long alkyl‐chain capping ligands.