期刊
FUEL PROCESSING TECHNOLOGY
卷 229, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2022.107174
关键词
2D Metal-organic framework; Nickel sulfides; Self-supported; Hydrogen evolution reaction
资金
- National Natural Science Foundation-China [51676171]
- Zhejiang Provincial Key Research and Development Program-China [2020C01135]
In this study, a novel Ni3S2@2D Co MOF catalyst was synthesized and exhibited excellent hydrogen evolution reaction (HER) activity in alkaline water electrolysis. The catalyst showed better HER performance than commercial Pt/C catalyst and demonstrated good stability. This can be attributed to the honeycomb structure formed by nickel sulfide nanosheets, which facilitated charge transfer and hydrogen evolution.
Developing efficient and stable non-noble metal electrocatalysts for alkaline hydrogen evolution poses a challenge for current research. Herein, a novel hierarchical hetero-electrocatalyst of Ni3S2@2D Co MOF was synthesized with cobalt metal-organic frameworks (Co-MOFs) crystallization on carbon paper (CP) and in-situ electrodeposition of Ni3S2 nanosheets. The catalyst Ni3S2@2D Co-MOF/CP exhibited an excellent hydrogen evolution reaction (HER) activity with a low overpotential of 140 mV and a small Tafel slope of 90.3 mV dec-1 at a current density of -10 mA cm-2. This catalyst demonstrated a lower overpotential (395 mV) than commercial Pt/C catalyst at a high current density (>130 mA cm-2). The efficient and stable HER performance of Ni3S2@2D Co-MOF/CP was attributed to nickel sulfide honeycomb nanosheets grown on two-dimensional MOF frameworks, which were conducive to charge transfer and hydrogen evolution. The electron-rich nickel sulfide surface significantly diminished H* adsorption and reduced energy barrier of H2 generation to promote HER process. This work provides a new strategy for practical preparation of efficient and stable transition metal electrocatalysts.
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