期刊
CATALYSTS
卷 12, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/catal12121527
关键词
hydrogen energy; Z-scheme; nanocomposite; heterojunction
资金
- National Natural Science Foundation of China
- Natural Science Foundation of Anhui Province
- [51973078]
- [2108085MB48]
In this study, a Z-scheme heterojunction photocatalyst was successfully prepared, which can effectively separate photogenerated electrons and holes and enhance the hydrogen generation activity and stability.
How to restrain the recombination of photogenerated electrons and holes is still very important for photocatalytic hydrogen production. Herein, Z-scheme ZnWO4/Mn0.5Cd0.5S (ZWMCS) nanocomposites are prepared and are applied as visible-light driven precious metal cocatalyst free photocatalyst for hydrogen generation. The ZnWO4/Mn0.5Cd0.5S nanocomposites with 30 wt% ZnWO4 (ZWMCS-2) can reach a photocatalytic hydrogen evolution rate of 3.36 mmol g(-1) h(-1), which is much higher than that of single ZnWO4 (trace) and Mn0.5Cd0.5S (1.96 mmol g(-1) h(-1)). Cycling test reveals that the ZMWCS-2 nanocomposite can maintain stable photocatalytic hydrogen evolution for seven cycles (21 h). The type of heterojunction in the ZWMCS-2 nanocomposite can be identified as Z-scheme heterojunction. The Z-scheme heterojunction can effectively separate the electrons and holes, so that the hydrogen generation activity and stability of the ZWMCS-2 nanocomposite can be enhanced. This work provides a highly efficient and stable Z-scheme heterojunction photocatalyst for hydrogen generation.
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