期刊
ACS MATERIALS LETTERS
卷 2, 期 7, 页码 736-743出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.0c00209
关键词
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资金
- Singapore Ministry of Education [MOE2017-T2-1-073]
- Agency for Science, Technology, and Research (A*STAR), Singapore, through an AME Individual Research Grant [A1983c0026]
- National Natural Science Foundation of China [21803031]
- Shandong Provincial Natural Science Foundation [ZR2019BEM007]
- Shandong Postdoctoral Innovative Talents Support
Introduction of defects in a controllable way is important to modulate the electronic structure of catalysts toward enhancement of electrocatalytic activity. Herein we report that incorporation of fluorine into a cobalt phosphide alloy has a unique effect: it creates both F- anion doping and P vacancies, resulting in a nearly 15-fold enhancement of the catalytic activity for the hydrogen evolution reaction (HER) in neutral solution. The existence of dual defects in CoP was confirmed by extended X-ray absorption fine structure (EXAFS) curve fitting results and density functional theory calculations. We show that the dual-defect feature is beneficial for increasing the active-site exposure, tuning the surface wettability, and optimizing the electronic configuration of CoP for the HER. Our fluorine-based modulation protocol may be applicable to other metal alloy electrocatalysts toward more efficient energy conversion reactions.
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