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<p>CuAl₂O₄ spinel oxide was synthesized via a co-precipitation route and evaluated as a non-noble electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media. X-ray diffraction and Raman spectroscopy confirmed the formation of a phase-pure cubic spinel structure, while scanning electron microscopy revealed an agglomerated and porous morphology with rough surface features. Electrochemical measurements conducted in 1.0&#xa0;M KOH using a three-electrode configuration showed that CuAl₂O₄ exhibits clear HER activity with a low onset potential and stable polarization behavior. Electrochemical impedance spectroscopy indicated reduced charge-transfer resistance, and Tafel analysis revealed a Volmer-dominated reaction mechanism, identifying water dissociation as the rate-determining step. Direct hydrogen evolution measurements demonstrated stable and continuous hydrogen generation with a production rate of approximately 1053.5&#xa0;μmol&#xa0;h⁻<sup>1</sup>. These results demonstrate that CuAl₂O₄ is a stable and active aluminate spinel for alkaline hydrogen evolution and highlight its potential as an earth-abundant electrocatalyst.</p><p>.</p>

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Alkaline hydrogen evolution over CuAl₂O₄ spinel: electrochemical kinetics and hydrogen production

  • 期刊论文

  • 发表日期：

    2026年2月2日

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

摘要

CuAl₂O₄ spinel oxide was synthesized via a co-precipitation route and evaluated as a non-noble electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media. X-ray diffraction and Raman spectroscopy confirmed the formation of a phase-pure cubic spinel structure, while scanning electron microscopy revealed an agglomerated and porous morphology with rough surface features. Electrochemical measurements conducted in 1.0 M KOH using a three-electrode configuration showed that CuAl₂O₄ exhibits clear HER activity with a low onset potential and stable polarization behavior. Electrochemical impedance spectroscopy indicated reduced charge-transfer resistance, and Tafel analysis revealed a Volmer-dominated reaction mechanism, identifying water dissociation as the rate-determining step. Direct hydrogen evolution measurements demonstrated stable and continuous hydrogen generation with a production rate of approximately 1053.5 μmol h⁻1. These results demonstrate that CuAl₂O₄ is a stable and active aluminate spinel for alkaline hydrogen evolution and highlight its potential as an earth-abundant electrocatalyst.

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