Glycine‐Functionalized CsPbBr₃ Nanocrystals for Efficient Visible‐Light Photocatalysis of CO₂ Reduction

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 CO2 adsorption and hinder the efficient carrier separation on the surface of MHP NCs, leading to inferior catalytic activity in artificial photosynthesis. Herein, CsPbBr3 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 CO2 uptake capacity are noticeably improved without compromising the stability of the MHP NCs. The CsPbBr3 nanocrystals with glycine ligands exhibit a significantly increased yield of 27.7 μmol g−1 h−1 for photocatalytic CO2‐to‐CO conversion without any organic sacrificial reagents, which is over five times higher than that of control CsPbBr3 NCs with conventional long alkyl‐chain capping ligands.

Assembling an Affinal 0D CsPbBr3/2D CsPb2Br5 Architecture by Synchronously In Situ Growing CsPbBr3 QDs and CsPb2Br5 Nanosheets: Enhanced Activity and Reusability for Photocatalytic CO2 Reduction

“…In addition, as is known, a typical feature of bromine lead perovskite is its abundant Br vacancies and high defect tolerance. Thus, the energy band gap ( E g ) can be further fine-tuned by the amount of Br vacancies. , In this way, an inexhaustible solar light-driven photoconversion could be well achieved for the affinal bromine lead perovskite materials by expanding their absorption band edge to a wide solar wavelength range.…”

Surface Defect Engineering of CsPbBr3 Nanocrystals for High Efficient Photocatalytic CO2 Reduction

“…In addition, the CsPbBr 3 NCs are capped with long‐chain organic ligands, which reduce the electrical conductivity of NCs and hinder the access of CO 2 substrates. [ 11 ] To enhance the charge separation efficiency and to achieve high efficient photocatalytic performance based on CsPbBr 3 photocatalyst, surface engineering of CsPbBr 3 NCs is highly demanded. In this regard, we rationally modified the surface defects of CsPbBr 3 NCs by two‐step electrostatic self‐assembly approach (as shown in Scheme , see details in the Experimental Section of Supporting Information).…”

Research Progress on Photocatalytic Reduction of CO2 Based on CsPbBr3 Perovskite Materials

“…Most CsPbBr 3 nanocrystals have unavoidable defects on their surfaces that act as a recombination center of charge, reducing their photocatalytic performance. In addition, CsPbBr 3 nanocrystals are covered by long‐chain organic ligands, reducing the conductivity of CsPbBr 3 nanocrystals and hindering contact with CO 2 , [65] by using the surface modification method of the end‐terminated ligand is conducive to the removal of ligands and defects, and the photocatalytic performance of inorganic metal halides is improved. Li et al [51] .…”