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<p>MnCo<sub>2</sub>O<sub>4</sub> spinel was successfully synthesized via a co-precipitation method and characterized using XRD, SEM, and EDS analyses, confirming the formation of a well-crystallized cubic spinel structure with a porous nanoscale morphology. Electrochemical investigations performed in 1.0&#xa0;M KOH revealed that the MnCo<sub>2</sub>O<sub>4</sub> electrode exhibited an overpotential of 83&#xa0;mV at a current density of 10&#xa0;mA&#xa0;cm<sup>−2</sup> and a Tafel slope of 33.28&#xa0;mV&#xa0;dec<sup>−1</sup> toward the hydrogen evolution reaction (HER). Electrochemical impedance spectroscopy demonstrated low charge-transfer resistance, indicating favorable interfacial electron-transfer kinetics. In addition, the catalyst showed stable hydrogen generation with a production rate of 1063&#xa0;μmol&#xa0;h<sup>−1</sup>, confirming its good electrochemical durability. The enhanced HER activity was attributed to the synergistic effects of the spinel structure, mixed valence states, and porous interconnected morphology, which collectively promoted charge transport and increased the number of accessible active sites. These results demonstrate the potential of MnCo<sub>2</sub>O<sub>4</sub> as an efficient noble-metal-free electrocatalyst for alkaline hydrogen production.</p>

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MnCo2O4 spinel as a noble-metal-free electrocatalyst for hydrogen evolution in alkaline media

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Khaled Derkaoui,
  • Ismail Bencherifa,
  • Khadidja Boukhouidem,
  • Amel Elfiad,
  • Khaled Wassim Bourkeb,
  • Yamina Mebdoua,
  • Toufik Hadjersi,
  • Mohamed Kechouane,
  • Mohamed Trari,
  • Mohamed Mehdi Kaci

摘要

MnCo2O4 spinel was successfully synthesized via a co-precipitation method and characterized using XRD, SEM, and EDS analyses, confirming the formation of a well-crystallized cubic spinel structure with a porous nanoscale morphology. Electrochemical investigations performed in 1.0 M KOH revealed that the MnCo2O4 electrode exhibited an overpotential of 83 mV at a current density of 10 mA cm−2 and a Tafel slope of 33.28 mV dec−1 toward the hydrogen evolution reaction (HER). Electrochemical impedance spectroscopy demonstrated low charge-transfer resistance, indicating favorable interfacial electron-transfer kinetics. In addition, the catalyst showed stable hydrogen generation with a production rate of 1063 μmol h−1, confirming its good electrochemical durability. The enhanced HER activity was attributed to the synergistic effects of the spinel structure, mixed valence states, and porous interconnected morphology, which collectively promoted charge transport and increased the number of accessible active sites. These results demonstrate the potential of MnCo2O4 as an efficient noble-metal-free electrocatalyst for alkaline hydrogen production.