期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 269, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118806
关键词
Schottky junction; Zn vacancy defects; ZnS; Ni-P alloy; Visible-light photocatalytic H-2 generation
资金
- National Natural Science Foundation of China [21373050, 21673043, 51871058]
- National Key Basic Research Program of China (973 Program) [2014CB260410]
- Independent Research Project of State Key Laboratory of Photocatalysis on Energy and Environment [SKLPEE2017B01]
- Natural Science Foundation of Fujian Province [2019J01630]
The development of efficient and stable photocatalysts is fundamentally required for sunlight-driven water splitting. Herein, Ni-P alloy is controllably anchored onto the surface of defect-rich ZnS (DR-ZnS) nanospheres through in-situ photodeposition strategy. The optimized Ni-P/DR-ZnS nanocomposite displays superior visible-light photocatalytic H2 production rate (69.92 mu mol h(-1)), which is about 29 times and 3.6 times higher than that of the bare DR-ZnS and 1 wt% Pt/DR-ZnS, respectively, and a notable apparent quantum yield of 2.4 % at 420 nm. The existence of rich defects endows the DR-ZnS with visible-light absorption capability. The constructed Schottky junction between the Ni-P alloy and DR-ZnS accelerates the transfer of photogenerated electrons from DR-ZnS to Ni-P, thus boosting the photocatalytic performance. Moreover, the charge transfer process and underlying photocatalytic mechanism are unravelled by multiple in-depth characterizations. This research sheds novel light on rationally fabricating high-efficient and low-cost photocatalysts through integrating defect engineering and Schottky junction design.
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