In Situ Hydrothermal Synthesis of ZnS/TiO<sub>2</sub> Nanofibers S‐Scheme Heterojunction for Enhanced Photocatalytic H<sub>2</sub> Evolution
Quanpeng Wang, Guohong Wang, Juan Wang, Jinmao Li, Kai Wang, Shuang Zhou, Yaorong Su
Abstract
Abstract Photocatalysts with step‐scheme (S‐scheme) heterojunctions exhibit huge potential in hydrogen evolution via photocatalytic water splitting, which is regarded as a promising technology to solve the energy crisis and environmental issues. In this work, S‐scheme heterojunction photocatalysts are constructed by in situ depositing ZnS nanoparticles on TiO 2 nanofibers via hydrothermal method. A highly improved photocatalytic H 2 evolution rate is achieved for the ZnS/TiO 2 heterojunction as compared to the mono‐component ZnS and TiO 2 . Remarkably, the TiO 2 /ZnS‐5 (TZ‐5) sample possesses the highest H 2 evolution rate of 5503.8 µmol g ‐1 h ‐1 , which is 4.8 times of ZnS and 38.8 times of TiO 2 , respectively. The observed photocatalytic performance improvement is mainly attributed to the construction of an S‐scheme heterojunction, which results in the fast separation of the photogenerated e − –h + pairs and enhanced redox capacity of the system. This work may provide inspirations and designing references for developing high‐performance S‐scheme heterojunction photocatalysts.