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<p>Transition metal oxides (NiCo<sub>2</sub>O<sub>4</sub>) exhibit excellent electrochemical performance due to their dual-metal synergy effect, but their conductivity and cycling stability still need to be improved. Although the research on pure NiCo<sub>2</sub>O<sub>4</sub> has been quite in-depth, the improvement of its electrochemical performance through doping with rare earth elements (especially Eu) remains an emerging direction. In this work, a europium-doped nickel cobaltate composite (Eu-NiCo<sub>2</sub>O<sub>4</sub>) was synthesized using the sol-gel method. The effect of different reaction times on the electrochemical performance of NiCo<sub>2</sub>O<sub>4</sub> was systematically investigated. Results showed that a reaction time of 5&#xa0;h yielded the optimal performance. Characterization confirmed the successful incorporation of Eu into the NiCo<sub>2</sub>O<sub>4</sub> lattice. The introduction of Eu significantly improved the material’s electrochemical properties. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests demonstrated that Eu doping enhanced both redox activity and charge transport kinetics. The Eu-NiCo<sub>2</sub>O<sub>4</sub> composite achieved a high specific capacitance of 1928&#xa0;F/g at 1&#xa0;A/g and maintained 1333&#xa0;F/g even at 10&#xa0;A/g. After 10,000 cycles, its specific capacitance retention rate reached as high as 98.6%, demonstrating excellent cycle stability. Furthermore, a solid-state asymmetric supercapacitor (Eu-NiCo<sub>2</sub>O<sub>4</sub>//CNTs), using Eu-NiCo<sub>2</sub>O<sub>4</sub> as the positive electrode and carbon nanotubes (CNTs) as the negative electrode, exhibited excellent energy densities (65.2 Wh/kg) and power densities (12000&#xa0;W/kg), highlighting its strong potential for high-performance energy storage applications.</p>

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Research on the design and construction of Eu-doped NiCo2O4 nanoflower electrode materials and the enhancement of capacitive performance

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Hengwei Pu,
  • Junping Ma

摘要

Transition metal oxides (NiCo2O4) exhibit excellent electrochemical performance due to their dual-metal synergy effect, but their conductivity and cycling stability still need to be improved. Although the research on pure NiCo2O4 has been quite in-depth, the improvement of its electrochemical performance through doping with rare earth elements (especially Eu) remains an emerging direction. In this work, a europium-doped nickel cobaltate composite (Eu-NiCo2O4) was synthesized using the sol-gel method. The effect of different reaction times on the electrochemical performance of NiCo2O4 was systematically investigated. Results showed that a reaction time of 5 h yielded the optimal performance. Characterization confirmed the successful incorporation of Eu into the NiCo2O4 lattice. The introduction of Eu significantly improved the material’s electrochemical properties. Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests demonstrated that Eu doping enhanced both redox activity and charge transport kinetics. The Eu-NiCo2O4 composite achieved a high specific capacitance of 1928 F/g at 1 A/g and maintained 1333 F/g even at 10 A/g. After 10,000 cycles, its specific capacitance retention rate reached as high as 98.6%, demonstrating excellent cycle stability. Furthermore, a solid-state asymmetric supercapacitor (Eu-NiCo2O4//CNTs), using Eu-NiCo2O4 as the positive electrode and carbon nanotubes (CNTs) as the negative electrode, exhibited excellent energy densities (65.2 Wh/kg) and power densities (12000 W/kg), highlighting its strong potential for high-performance energy storage applications.