Simultaneous Manipulation of Bulk Excitons and Surface Defects for Ultrastable and Highly Selective CO2 Photoreduction

• DOI: 10.1002/adma.202100143
• Publication Date: 2021-07-31T08:38:44Z
• Authors: Yanbiao Shi; Guangming Zhan; Hao Li; Xiaobing Wang; Xiufan Liu; Lujia Shi; Kai Wei; Cancan Ling; Zhilin Li; Hao Wang; Chengliang Mao; Xiao Liu; Lizhi Zhang
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

Abstract The objective of photocatalytic CO 2 reduction (PCR) is to achieve high selectivity for a single energy‐bearing product with efficiency and stability. bulk configuration usually determines charge carrier kinetics, whereas surface atomic arrangement defines the PCR thermodynamic pathway. Concurrent engineering structures therefore crucial achieving goal PCR. Herein, an ultrastable highly selective using homogeneously doped BiOCl nanosheets synthesized via inventive molten strategy presented. With B O 3 as both salt doping precursor, this new approach ensures boron (B) from into dual functionalities. Bulk mitigates strong excitonic effects confined in 2D by significantly reducing exciton binding energies, surface‐doped atoms reconstruct extracting lattice hydroxyl groups, resulting intimate B‐oxygen vacancy (B‐OV) associates. These exclusive B‐OV associates enable spontaneous activation, suppress competitive hydrogen evolution promote proton‐coupled electron transfer step stabilizing *COOH generation. As result, homogeneous B‐doped exhibit 98% ‐to‐CO under visible light, impressive rate 83.64 µmol g −1 h ultrastability long‐term testing 120 h.