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<p>This work reports for the first time the application of copper coatings prepared by cold spray deposition as electrocatalysts for the hydrogen evolution reaction (HER) in alkaline medium. Structural and surface characterizations (SEM, EDX, XRD, Raman spectroscopy, and profilometry) revealed dense and adherent coatings with a highly textured surface, enhanced roughness, and the coexistence of metallic Cu, Cu<sub>2</sub>O, and CuO phases. These features were directly correlated with superior electrocatalytic performance. The cold-sprayed Cu electrode exhibited a low onset potential of 0.26&#xa0;V vs. RHE, a Tafel slope of 94.2&#xa0;mV&#xa0;dec<sup>−1</sup>, and an exchange current density of 4.17&#xa0;mA&#xa0;cm<sup>−2</sup>, confirming improved HER kinetics compared with bulk Cu. Electrochemical impedance spectroscopy indicated a reduced charge-transfer resistance, while hydrogen quantification demonstrated a stable production rate of 1330.59&#xa0;µmol&#xa0;h<sup>−1</sup> under continuous operation. The results establish cold spray as a novel and scalable strategy to fabricate efficient Cu-based electrodes, opening new avenues for large-scale hydrogen production.</p>

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Cold-sprayed copper coatings as novel electrocatalysts for the hydrogen evolution reaction in alkaline medium

  • 期刊论文

  • 发表日期：

    2025年9月28日

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  • Khaled Derkaoui,
  • Yamina Mebdoua,
  • Amira Djaibet,
  • Hadil Laiche,
  • Chaker Serdani,
  • Hadj Lahmar,
  • Soumia Benredouane,
  • Khadidja Boukhouidem,
  • Naitbouda Abdelyamine,
  • Lemboub Samia,
  • Derbal Habak Hassina,
  • Toufik Hadjersi

摘要

This work reports for the first time the application of copper coatings prepared by cold spray deposition as electrocatalysts for the hydrogen evolution reaction (HER) in alkaline medium. Structural and surface characterizations (SEM, EDX, XRD, Raman spectroscopy, and profilometry) revealed dense and adherent coatings with a highly textured surface, enhanced roughness, and the coexistence of metallic Cu, Cu2O, and CuO phases. These features were directly correlated with superior electrocatalytic performance. The cold-sprayed Cu electrode exhibited a low onset potential of 0.26 V vs. RHE, a Tafel slope of 94.2 mV dec−1, and an exchange current density of 4.17 mA cm−2, confirming improved HER kinetics compared with bulk Cu. Electrochemical impedance spectroscopy indicated a reduced charge-transfer resistance, while hydrogen quantification demonstrated a stable production rate of 1330.59 µmol h−1 under continuous operation. The results establish cold spray as a novel and scalable strategy to fabricate efficient Cu-based electrodes, opening new avenues for large-scale hydrogen production.