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Surface sulfidation toward highly active S/NiMoSe for superior alkaline hydrogen evolution
Xinyu Li1, Huaiqing Yan1, Yue Xiao1
1School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, 832003, China. wenguo@shzu.edu.cn.
A novel electrocatalyst using S/NiMoSe hierarchical microspheres on nanofibers was developed for efficient alkaline hydrogen evolution. Surface sulfidation enhances activity and stability by altering water interactions and forming sulfate ions.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) is crucial for clean energy technologies.
- Alkaline HER electrocatalysts often face challenges with activity and long-term stability.
Purpose of the Study:
- To synthesize and characterize a novel S/NiMoSe hierarchical microsphere-supported nanofiber electrocatalyst.
- To investigate the mechanism behind the enhanced alkaline HER performance and stability.
Main Methods:
- Surface sulfidation strategy was employed to synthesize the S/NiMoSe electrocatalyst.
- Electrochemical measurements were conducted to evaluate the HER performance in alkaline media.
- Surface analysis techniques were used to understand the structural and chemical changes upon sulfidation.
Main Results:
- The synthesized S/NiMoSe electrocatalyst demonstrated excellent performance in the alkaline hydrogen evolution reaction.
- Surface sulfidation was found to weaken interfacial water hydrogen-bonding.
- Reconstruction of the catalyst surface generated sulfate ions (SO42-), contributing to sustained activity.
Conclusions:
- The S/NiMoSe hierarchical microsphere-supported nanofiber electrocatalyst offers a promising pathway for efficient alkaline HER.
- The surface sulfidation strategy effectively enhances both the activity and stability of the electrocatalyst.
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