Photocatalytic performance and mechanism of hydrogen evolution from water over ZnCdS/Co@CoO in sacrificial agent-free system. (15th July 2022)

• Record Type: Journal Article
• Authors: Zou, Yangyang; Guo, Changyan; Cao, Xianglei; Chen, Tingxiang; Kou, Yuli; Zhang, Liugen; Wang, Tao; Akram, Naeem; Wang, Jide
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 60(2022)
• Page Start: 25289
• Page End: 25299
• Publication Date: 2022-07-15
• Subjects: ZnCdS/Co@CoO -- S-scheme heterojunction -- S vacancy -- Photocatalytic -- Hydrogen evolution; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.05.251
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Photocatalytic efficient hydrogen evolution from pure water with non-noble metal system has more practical application value. In this study, the ZnCdS/Co@CoO composite photocatalyst was prepared by a simple hydrothermal reduction method. The hydrogen evolution rate from water can reach to 793 μmol·g −1 ·h −1 in sacrificial agent-free system, and 5445 μmol·g −1 ·h −1 with Na2 S and Na2 SO3 as sacrificial agent. The S-scheme heterojunction formed between ZnCdS and Co@CoO, as well as the abundant S vacancy were proved to be the key factors to effectively improve the photocatalytic performance. The study on the high hydrogen production efficiency and catalytic mechanism of ZnCdS/Co@CoO in sacrificial agent-free can provide ideas for the design and preparation of more efficient non-noble metal photocatalysts. Graphical abstract: Image 1 Highlights: The tiny ZnCdS/Co@CoO nanoparticles effectively shorten the electron transport distance. The hydrogen yield can reach 793 μmol g −1 h −1 in sacrificial agent-free system. The S vacancy acts as electron trap and avoids the recombination of electrons and holes. The S-scheme heterojunction can be constructed between ZnCdS and Co@CoO. The S-scheme heterojunction is favorable for the separation and transfer of electron-hole pair.