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<p>This work investigates the potential of CuFe₂O₄ as a negative electrode material for Ni-MH batteries, with a particular focus on enhancing discharge capacity, cycling stability, and kinetic performance. The material was synthesized using the sol–gel method, and X-ray diffraction (XRD) confirmed the successful formation of crystalline copper spinel ferrite nanoparticles with a tetragonal CuFe₂O₄ structure, together with a secondary cubic Fe₂O₃ phase. The electrochemical performance of CuFe₂O₄ was systematically evaluated at 298&#xa0;K by chronopotentiometry and cyclic voltammetry. Chronopotentiometric analysis identified 0.8&#xa0;mA as the optimal discharge current, enabling rapid electrode activation and delivering a high discharge capacity. Moreover, adjusting the discharge potential between − 0.2&#xa0;V and 0.5&#xa0;V revealed a maximum specific capacity of 265 mAh/g at 0.5&#xa0;V. Long-term cycling experiments demonstrated that discharge potentials of − 0.2&#xa0;V and 0.5&#xa0;V provided superior electrode stability. These results were further supported by kinetic analysis from cyclic voltammetry, which confirmed enhanced electrochemical stability at the same discharge potentials.</p> Graphical Abstract <p>The aim of this study is to optimize the performance of nickel–metal hydride (Ni–MH) batteries by employing a perovskite-type oxide, CuFe<sub>2</sub>O4, as the negative electrode material. The compound was synthesized via the sol–gel method, and its structural characteristics were investigated through X-ray diffraction (XRD) and scanning electron microscopy (SEM). Furthermore, electrochemical performance was evaluated using galvanostatic polarization and cyclic voltammetry to assess key parameters such as electrochimical discharge capacity,Stability, exchange current density and the Nernst potential.</p> <p></p>

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Structural and Electrochemical Properties of CuFe2O4 Spinel Ferrite Synthesized Via a Sol-Gel Method for Ni-MH Battery Applications

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Houyem Gharbi,
  • Imen Karaoud,
  • Wissem Zayani,
  • Youssef Dabaki,
  • Chokri Khaldi,
  • Omar ElKedim,
  • Nouredine Fenineche,
  • Jilani Lamloumi

摘要

This work investigates the potential of CuFe₂O₄ as a negative electrode material for Ni-MH batteries, with a particular focus on enhancing discharge capacity, cycling stability, and kinetic performance. The material was synthesized using the sol–gel method, and X-ray diffraction (XRD) confirmed the successful formation of crystalline copper spinel ferrite nanoparticles with a tetragonal CuFe₂O₄ structure, together with a secondary cubic Fe₂O₃ phase. The electrochemical performance of CuFe₂O₄ was systematically evaluated at 298 K by chronopotentiometry and cyclic voltammetry. Chronopotentiometric analysis identified 0.8 mA as the optimal discharge current, enabling rapid electrode activation and delivering a high discharge capacity. Moreover, adjusting the discharge potential between − 0.2 V and 0.5 V revealed a maximum specific capacity of 265 mAh/g at 0.5 V. Long-term cycling experiments demonstrated that discharge potentials of − 0.2 V and 0.5 V provided superior electrode stability. These results were further supported by kinetic analysis from cyclic voltammetry, which confirmed enhanced electrochemical stability at the same discharge potentials.

Graphical Abstract

The aim of this study is to optimize the performance of nickel–metal hydride (Ni–MH) batteries by employing a perovskite-type oxide, CuFe2O4, as the negative electrode material. The compound was synthesized via the sol–gel method, and its structural characteristics were investigated through X-ray diffraction (XRD) and scanning electron microscopy (SEM). Furthermore, electrochemical performance was evaluated using galvanostatic polarization and cyclic voltammetry to assess key parameters such as electrochimical discharge capacity,Stability, exchange current density and the Nernst potential.