S vacant CuIn <sub>5</sub> S <sub>8</sub> confined in a few‐layer MoSe <sub>2</sub> with interlayer‐expanded hollow heterostructures boost photocatalytic CO <sub>2</sub> reduction
Lijuan Chen, Ting‐Ting Liu, Shuming Liu, Sheng Cai, Xiaoxiao Zou, Jingwen Jiang, Zhiyuan Mei, Genfu Zhao, Xiaofei Yang, Hong Guo
Abstract
Abstract The conversion of CO 2 into CO, CH 4 and other hydrocarbons through solar energy can alleviate the energy shortage problem. We design a novel photocatalyst with S defects CuIn 5 S 8 @MoSe 2 hollow structure. The interlayer‐expanded MoSe 2 can increase the adsorption of intermediates. The unique hollow structure can improve the light utilization efficiency and the electron–holes separation. CuIn 5 S 8 with S vacancies in bimetallic sites has high selectivity and photocatalytic reduction of CO 2 activity. Therefore, S vacant CuIn 5 S 8 confined in a few‐layers MoSe 2 with interlayer‐expanded hollow heterostructures exhibit super performance for photocatalytic CO 2 reduction. After 8‐h light reaction, the outputs of CO and CH 4 for the 15.3 wt% CuIn 5 S 8 @MoSe 2 sample containing S vacancies (V s ) are 30.4 and 14.7 µmol·g −1 , respectively. The mechanism is also investigated in detail through in situ Fourier transform infrared spectroscopy technology.