Synergistic effect of bimetallic cobalt-based sulfide enhances the performance of ZnSe photocatalytic hydrogen evolution by Z-scheme

• Published in: Journal of alloys and compounds 2023-12, Vol.967, p.171614, Article 171614
• Main Authors: Wang, Haihong, Feng, Sheng, Huang, Haitao, Ma, Changchang, Dai, Xiaojun, Bian, Zhaowei, Wu, Kaidi, Fan, Lufang, Hua, Jinghao
• Format: Article
• Language: English
• Subjects: Hydrogen evolution; Photocatalysis; Z-scheme; ZnSe/ZnCo2S4
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.171614

In this work, ZnSe/ZnCo2S4 (ZCS) composites were synthesized by simple hydrothermal method and Z-scheme heterojunctions were formed. Under the simulated sunlight environment, The results show that the hydrogen production efficiency of 70 wt% ZnSe/ZCS composites was as high as 3402.4 μmol·g−1·h−1, which is 4.37 and 94.44 times that of ZnSe and ZCS monomers, respectively, and the apparent quantum efficiency (AQY) reaches 10.5%. Among them, the Z-scheme heterojunction improves the redox ability of the material, which is more conducive to charge separation, and ZCS also promotes absorption of visible light of ZnSe/ZCS. In addition, the Z-scheme heterojunction structure and material stability were verified by XPS, ESR.This work provides a new way to improve ZnSe in the field of photocatalytic hydrogen evolution. [Display omitted] •The Z-scheme heterojunction improve the utilization efficiency of charge and retain great redox capacity.•ZnSe/ZCS have excellent activity for photocatalytic hydrogen evolution.•The framework provided by ZCS allowed ZnSe to expose more active sites.•The composite photocatalysts owned excellent chemical stability.