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High-concentration CoNi-C interface for efficient alkaline hydrogen evolution.

Daoui Wang1, Shuo Wang1, Weihao Liao1

  • 1State Key Laboratory of Heavy Oil Processing, China University of Petroleum-, Beijing 102249, China.

Journal of Colloid and Interface Science
|December 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel CoNi alloy-carbon electrode for efficient alkaline hydrogen evolution reactions (HER). The new design maximizes interface concentration, boosting hydrogen production and offering exceptional stability in water electrolyzers.

Keywords:
Alkaline hydrogen evolutionCoNi-C interfaceConcentrationPrecursor size

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient hydrogen evolution reactions (HER) are crucial for sustainable energy technologies.
  • Conventional metal-carbon interfaces often exhibit low concentrations, limiting catalytic activity.
  • Developing strategies to increase interface density is key to enhancing HER performance.

Purpose of the Study:

  • To engineer a self-supporting electrode with a highly concentrated CoNi alloy-carbon interface.
  • To investigate the effect of precursor size engineering on metal dispersion and interface density.
  • To evaluate the HER performance and stability of the developed electrode in alkaline media and anion exchange membrane water electrolyzers (AEMWE).

Main Methods:

  • Electrodeposition of ZIF-67 with Ni(NO3)2 and trimesic acid to synthesize tunable Co, Ni-containing trimesic acid (Co$_{x}$Ni-BTC) precursors.
  • Pyrolysis of precursors to form the Co$_{x}$Ni-C/NF electrode with controlled interface concentration.
  • Electrochemical characterization of HER performance (overpotential, Tafel slope) and long-term stability tests.
  • Density Functional Theory (DFT) calculations to elucidate the mechanism of enhanced HER.

Main Results:

  • Achieved a highly concentrated CoNi-carbon interface (up to 4%) on nickel foam (Co$_{x}$Ni-C/NF) via precursor size engineering.
  • Co$_{50Ni-C/NF electrode demonstrated excellent HER performance in 1 M KOH: low overpotential (30 mV cm$^{-2}$ at 10 mA cm$^{-2}$), Tafel slope (45.1 mV dec$^{-1}$), and 72-hour stability.
  • In an AEMWE, the Co$_{50Ni-C/NF||RuO$_{2}$/NF system achieved 0.5 A cm$^{-2}$ at 1.93 V and maintained stability for 100 hours at 0.2 A cm$^{-2}$.

Conclusions:

  • The developed CoNi-C/NF electrode with a high-concentration interface significantly enhances alkaline HER performance and durability.
  • Precursor size engineering is an effective strategy for controlling metal dispersion and interface density in catalysts.
  • DFT calculations confirm that the dense interface improves conductivity, water adsorption, and hydrogen evolution kinetics, offering a promising route for advanced HER electrodes.