Modulation of catalyst microenvironments in ZnIn2S4/g-C3N4 S-scheme heterojunction for ratio-tunable syngas production from CO2 photoreduction
Yazi Liu, Aixin Deng, Yingjiaqi Yin, Jingkai Lin, Qi Li, Yue Sun, Jinqiang Zhang, Shiyin Li, Shaogui Yang, Yan Xu, Huan He, Shaomin Liu, Shaobin Wang
Abstract
Photocatalytic CO 2 reduction for syngas production holds immense promise in the realm of valuable chemical synthesis. However, its potential is significantly hindered by the sluggish dynamics and non-selective outputs of charge carriers, attributable to the intricate microenvironment of photocatalysts. Herein, a facile approach was proposed to enhance syngas production by fabricating S-scheme ZnIn 2 S 4 /g-C 3 N 4 (ZISCN) heterojunctions with strategically tailored microenvironments. Theoretical calculations and elaborate experimental results confirmed that modifying the interfacial microenvironment with C−S bonds manipulated the photoexcited charge dynamics, while adjusting the surface microenvironment with In vacancies created CO 2 adsorption sites, facilitating charge accumulations on ZIS surface. The modulation of catalyst microenvironments promoted the formation of COOH* and CHO* intermediates, thereby enabling efficient and controllable syngas production. Our findings establish a framework for the development of intricate heterojunction photocatalysts that leverage sunlight effectively for clean energy generation. • A S-scheme ZISCN heterojunction with In vacancy and C−S bond was obtained. • Modulation of interfacial microenvironment enhanced the charge dynamics. • Regulation of surface microenvironment promoted CO 2 adsorption. • Modifying catalyst microenvironment boosted the tunable production of syngas.