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<p>A NiCoP–graphene hybrid electrode supported on three-dimensional nickel foam (NiCoP–Gr/NF) was successfully fabricated and evaluated for the hydrogen evolution reaction (HER) in alkaline media. The electrode was prepared via a two-step process involving electrophoretic deposition of graphene onto nickel foam followed by phosphidation, enabling uniform incorporation of graphene within the bimetallic NiCoP matrix. Structural and surface characterizations (SEM, EDX, XRD, Raman spectroscopy, and XPS) revealed a homogeneous and porous coating composed of ultrafine NiCoP nanoparticles tightly anchored on wrinkled graphene sheets across the nickel foam framework. Electrochemical testing in 1&#xa0;M KOH demonstrated an overpotential of 168&#xa0;mV at a current density of 10&#xa0;mA&#xa0;cm⁻<sup>2</sup> and a Tafel slope of 48.9&#xa0;mV dec⁻<sup>1</sup>, indicating fast HER kinetics. The improved catalytic performance is attributed to the synergistic interaction between NiCoP and graphene, which enhances charge-transfer efficiency, increases electrochemically active surface area, and promotes efficient electrolyte diffusion within the three-dimensional porous structure. These results demonstrate the effectiveness of the NiCoP–graphene hybrid architecture as a robust and efficient electrode for alkaline hydrogen evolution.</p>

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NiCoP–graphene hybrid supported on 3D nickel foam: a synergistic electrode architecture for enhanced alkaline hydrogen evolution

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Soumia Benredouane,
  • Amal Elfiad,
  • Madjid Ifires,
  • Khaled Derkaoui,
  • Sabrina Naama,
  • Toufik Hadjersi

摘要

A NiCoP–graphene hybrid electrode supported on three-dimensional nickel foam (NiCoP–Gr/NF) was successfully fabricated and evaluated for the hydrogen evolution reaction (HER) in alkaline media. The electrode was prepared via a two-step process involving electrophoretic deposition of graphene onto nickel foam followed by phosphidation, enabling uniform incorporation of graphene within the bimetallic NiCoP matrix. Structural and surface characterizations (SEM, EDX, XRD, Raman spectroscopy, and XPS) revealed a homogeneous and porous coating composed of ultrafine NiCoP nanoparticles tightly anchored on wrinkled graphene sheets across the nickel foam framework. Electrochemical testing in 1 M KOH demonstrated an overpotential of 168 mV at a current density of 10 mA cm⁻2 and a Tafel slope of 48.9 mV dec⁻1, indicating fast HER kinetics. The improved catalytic performance is attributed to the synergistic interaction between NiCoP and graphene, which enhances charge-transfer efficiency, increases electrochemically active surface area, and promotes efficient electrolyte diffusion within the three-dimensional porous structure. These results demonstrate the effectiveness of the NiCoP–graphene hybrid architecture as a robust and efficient electrode for alkaline hydrogen evolution.