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Dual anions engineering on nickel cobalt-based catalyst for optimal hydrogen evolution electrocatalysis
Qiong Sun1, Yun Tong2, Pengzuo Chen3
1Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Developing novel electrocatalysts is key for renewable energy. This study introduces dual phosphorus/sulfur doped nickel-cobalt materials on nickel foam, significantly boosting hydrogen evolution reaction (HER) efficiency for energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- The hydrogen evolution reaction (HER) is crucial for renewable energy storage.
- Improving earth-abundant metal electrocatalysts for HER remains a significant challenge.
Purpose of the Study:
- To develop highly efficient and low-cost electrocatalysts for HER.
- To investigate the effect of dual phosphorus/sulfur doping on nickel-cobalt bimetallic materials.
Main Methods:
- Fabrication of dual P/S doped nickel-cobalt bimetallic material on nickel foam (Sn-NiCoPx-NF) via a one-step phosphorization/sulfuration reaction.
- Electrochemical characterization of the synthesized catalysts for HER performance in alkaline medium.
Main Results:
- The S2-NiCoPx/NF catalyst exhibited excellent HER activity with an overpotential of 144 mV at 50 mA cm-2.
- This represents a 190 mV reduction compared to the pristine NiCoPx-NF catalyst.
- The catalyst demonstrated fast reaction kinetics (Tafel slope of 66 mV/dec) and high stability.
Conclusions:
- Dual anion (P/S) modification is an effective strategy for enhancing electrocatalyst activity for HER.
- The developed S2-NiCoPx/NF catalyst offers a promising, low-cost alternative for energy storage and conversion devices.
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