Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 21, Pages 30194-30202Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.07.199
Keywords
Bimetallic sulfide; ZnCo2S4; g-C3N4; S-scheme
Categories
Funding
- National Natural Science Foundation of China [21676213, 22078261]
- Natural Science Basic Research Program of Shaanxi [2020JM-422]
- China Postdoctoral Science Foundation [2016M600809]
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Transition bimetallic sulfides have shown superior electrochemical characteristics compared to their parent materials, with ZnCo2S4/CN exhibiting significantly enhanced photocatalytic water splitting activity. The presence of zinc and cobalt ions in ZnCo2S4 lowered the H-2 evolution overpotential and charge recombination rate, leading to excellent H-2 release activity. Trapping experiments confirmed the S-scheme charge transfer route between ZnCo2S4 and CN, demonstrating a promising bimetallic sulfide heterojunction for enhancing H-2 evolution during water splitting.
Transition bimetallic sulfides have attracted widespread attention because of their superior electrochemical characteristics compared to their parent materials. Herein, ternary ZnCo2S4 was deposited on g-C3N4 (CN) to enhance the photocatalytic water splitting reactivity of CN. The hydrogen (H-2) evolution rate of 25 wt %-ZnCo2S4/CN reached 6619 mu mol h(-1) g(-1) , which was 55.2 times higher than that of CN alone. Under the same conditions, ZnS/CN and Co3S4/CN were also synthesized, and their H-2 evolution rates were both inferior to that of ZnCo2S4/CN. Investigations showed that the presence of both zinc and cobalt ions in ZnCo2S4 lowered the H-2 evolution overpotential and charge recombination rate, leading to excellent H-2 release activity. In addition, the composite maintained its activity even after reacting for 20 h, and the charge transfer mechanism between ZnCo2S4 and CN was subject to the S-scheme charge transfer route according to trapping experiments for active species. This work revealed a promising and efficient bimetallic sulfide heterojunction to enhance H-2 evolution during water splitting and thus achieved improved conversion efficiency for solar energy applications.
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