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<p>Nanoparticles enhance supercapacitive performance by offering sustained longevity and enable the most effective active electrode materials. Herein, the effect of incorporating nickel ions on structural, morphological, and electrochemical characteristics of Mn/Ni–Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O is systematically examined. Samples of Mn–Co<sub>3</sub>(PO<sub>4</sub>)<sub>2·</sub>8H<sub>2</sub>O (CPM) and Mn/Ni-Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O (CPMN) were synthesized via the polyol-assisted reflux route. The CPMN electrode exhibited a high specific capacitance of 767 F g<sup>−1</sup> (corresponding to 345 C g<sup>−1</sup>) at 1 A g<sup>−1</sup>, along with excellent charge–discharge stability. When employed as the positive electrode in an asymmetric supercapacitor, the CPMN material delivered an energy density of 50 Wh kg<sup>−1</sup> and a power density of 750 W kg<sup>−1</sup> at 1 A g<sup>−1</sup>. Furthermore, the device retained 76% of its initial capacitance and maintained a Coulombic efficiency of 98% after 5000 cycles at 10 A g<sup>−1</sup>. These results highlight the strong potential of Mn/Ni-Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O as a durable and high-performance electrode material for practical energy-storage systems.</p> Graphical abstract <p></p>

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Enhancing the electrochemical performance of a binary nanocomposite by incorporation of nickel ions for asymmetric supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • A. Thilagasubbulakshmi,
  • V. Aurthi,
  • P. Sivakumar

摘要

Nanoparticles enhance supercapacitive performance by offering sustained longevity and enable the most effective active electrode materials. Herein, the effect of incorporating nickel ions on structural, morphological, and electrochemical characteristics of Mn/Ni–Co3(PO4)2·8H2O is systematically examined. Samples of Mn–Co3(PO4)2·8H2O (CPM) and Mn/Ni-Co3(PO4)2·8H2O (CPMN) were synthesized via the polyol-assisted reflux route. The CPMN electrode exhibited a high specific capacitance of 767 F g−1 (corresponding to 345 C g−1) at 1 A g−1, along with excellent charge–discharge stability. When employed as the positive electrode in an asymmetric supercapacitor, the CPMN material delivered an energy density of 50 Wh kg−1 and a power density of 750 W kg−1 at 1 A g−1. Furthermore, the device retained 76% of its initial capacitance and maintained a Coulombic efficiency of 98% after 5000 cycles at 10 A g−1. These results highlight the strong potential of Mn/Ni-Co3(PO4)2·8H2O as a durable and high-performance electrode material for practical energy-storage systems.

Graphical abstract