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<p>NiAl₂O₄ spinel was synthesized by a co-precipitation method and evaluated as an electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media. Structural and surface analyses confirmed the formation of a phase-pure, well-crystallized spinel with defect-rich surface oxygen species. Electrochemical measurements in 1.0&#xa0;M KOH revealed clear Ni<sup>2</sup>⁺/Ni<sup>3</sup>⁺ redox activity, low charge-transfer resistance, and favorable reaction kinetics. The NiAl₂O₄ electrode exhibits an onset potential of about 0.207&#xa0;V vs. RHE and a Tafel slope of approximately 204&#xa0;mV&#xa0;dec⁻<sup>1</sup>, indicating a Volmer-dominated HER mechanism. Stable hydrogen evolution was achieved with a production rate reaching 814.32&#xa0;µmol·h⁻<sup>1</sup>. These results demonstrate that NiAl₂O₄ is an effective noble-metal-free electrocatalyst for alkaline hydrogen evolution.</p>

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Nickel aluminate spinel as a noble-metal-free electrocatalyst for alkaline hydrogen evolution reaction

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Khaled Derkaoui,
  • Ismail Bencherifa,
  • Amal Elfiad,
  • Khadidja Boukhouidem,
  • Mohamed Kechouane,
  • Yamina Mebdoua,
  • Toufik Hadjersi

摘要

NiAl₂O₄ spinel was synthesized by a co-precipitation method and evaluated as an electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media. Structural and surface analyses confirmed the formation of a phase-pure, well-crystallized spinel with defect-rich surface oxygen species. Electrochemical measurements in 1.0 M KOH revealed clear Ni2⁺/Ni3⁺ redox activity, low charge-transfer resistance, and favorable reaction kinetics. The NiAl₂O₄ electrode exhibits an onset potential of about 0.207 V vs. RHE and a Tafel slope of approximately 204 mV dec⁻1, indicating a Volmer-dominated HER mechanism. Stable hydrogen evolution was achieved with a production rate reaching 814.32 µmol·h⁻1. These results demonstrate that NiAl₂O₄ is an effective noble-metal-free electrocatalyst for alkaline hydrogen evolution.