Anions‐Exchange‐Induced Efficient Carrier Transport at CsPbBr<sub>x</sub>Cl<sub>3‐x</sub>/TiO<sub>2</sub> Interface for Photocatalytic Activation of C(sp<sup>3</sup>)−H bond in Toluene Oxidation
Yizhou Zhao, Yi Dai, Qiuhe Wang, Yuanyuan Dong, Tinglu Song, А. В. Мудрый, Qi Chen, Yujing Li
Abstract
Abstract Inspired by the unique band structure of CsPbBr 3 , we have developed an asymmetric Cl‐exchange strategy based on the CsPbBr x Cl 3‐x /TiO 2 heterojunction‐type catalyst and achieved photocatalytic activation of C(sp 3 )−H bond using the toluene oxidation reaction as a proof‐of‐concept application. The anion exchange at the supported CsPbBr 3 surface results in the CsPbBr x Cl 3‐x /TiO 2 structure with an asymmetric distribution of halide. The resultant heterojunction‐type catalysts exhibit significantly improved photocatalytic activity for toluene oxidation reaction with the highest benzaldehyde production rate at 1874 μmol g −1 h −1 (∼4 times that of the naked CsPbBr 3 nanocrystals). The remarkable photocatalytic performance can be ascribed to the improved carrier transport at CsPbBr x Cl 3‐x /TiO 2 interface enabled by the unique band structure due to the asymmetric halide distribution, verified by the micro‐strain discovered through the X‐ray diffraction. This work demonstrates a new pathway to fabricate highly‐efficient halide perovskite heterojunction‐type catalysts for photocatalytic activation of C(sp 3 )−H bond.