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<p>The synthesized Cu<sub>x</sub>Ni<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> (x = 0.00–1.00) spinel ferrite nanoparticles via the polyol method were systematically investigated to understand the effect of Ni substitution on structural, morphological, and electrochemical properties for supercapacitor applications. While Ni substitution influences particle size, cation distribution, and redox activity, the Cu-rich composition (CuFe<sub>2</sub>O<sub>4</sub>, x = 1.00) exhibited the highest electrochemical performance, achieving a remarkable specific capacitance of 1540 F g<sup>−1</sup> at a scan rate of 1&#xa0;mA/cm<sup>2</sup> in 1&#xa0;M KOH, 85.67% capacitance retention over 5000 cycles, an energy density of 48&#xa0;Wh kg<sup>−1</sup>, and outstanding cycling stability. These enhancements are attributed to optimized cation distribution, reduced particle size (98&#xa0;nm), and efficient ion transport in the Cu-rich lattice. Integration of CuFe<sub>2</sub>O<sub>4</sub> into an asymmetric supercapacitor device has validated its practical applicability, delivering competitive energy and power densities. This study demonstrates that while Ni substitution provides valuable insights into structure–property relationships, CuFe<sub>2</sub>O<sub>4</sub>remains a superior candidate for next-generation high-performance and sustainable energy storage devices.</p>

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Inexpensive liquid-phase synthesized NiFe2O4 and Cu-substituted nickel ferrites for advanced energy storage

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Prashant N. Nikam,
  • Hela Ferjani,
  • Manikandan Ayyar,
  • Yasmeen G. Abou El-Reash,
  • Basem E. Keshta,
  • Habib Elhouichet,
  • Nouf M. Al Suliman,
  • Munawar Iqbal,
  • Md. Sanower Hossain,
  • Mika Sillanpää,
  • Rajendra P. Patil

摘要

The synthesized CuxNi1-xFe2O4 (x = 0.00–1.00) spinel ferrite nanoparticles via the polyol method were systematically investigated to understand the effect of Ni substitution on structural, morphological, and electrochemical properties for supercapacitor applications. While Ni substitution influences particle size, cation distribution, and redox activity, the Cu-rich composition (CuFe2O4, x = 1.00) exhibited the highest electrochemical performance, achieving a remarkable specific capacitance of 1540 F g−1 at a scan rate of 1 mA/cm2 in 1 M KOH, 85.67% capacitance retention over 5000 cycles, an energy density of 48 Wh kg−1, and outstanding cycling stability. These enhancements are attributed to optimized cation distribution, reduced particle size (98 nm), and efficient ion transport in the Cu-rich lattice. Integration of CuFe2O4 into an asymmetric supercapacitor device has validated its practical applicability, delivering competitive energy and power densities. This study demonstrates that while Ni substitution provides valuable insights into structure–property relationships, CuFe2O4remains a superior candidate for next-generation high-performance and sustainable energy storage devices.