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<p>This research presents the development of nanoscale nickel–cobalt oxide (NiCo₂O₄) and nickel tungstate (NiWO₄) sheet-like structures, vertically grown on a pliable nickel foam through a hydrothermal synthesis process, followed by heat treatment. Structural and morphological characteristics of the NiCo₂O₄@NiWO₄/Ni foam architecture were explored using techniques such as, XRD, SEM and XPS. These ultrathin nanosheets were subsequently utilized as electrode materials for supercapacitor fabrication. The composite electrode exhibited an outstanding charge storage capacity of 1178&#xa0;F g⁻¹ when tested at 1&#xa0;A g⁻¹, and retained a high capacitance of 1101&#xa0;F g⁻¹ at 5&#xa0;A g⁻¹. Long-term stability testing revealed a capacitance retention of 93.4% after 5000 continuous charge–discharge cycles at the same current density. The hybrid system significantly outperformed electrodes made solely of NiCo₂O₄, demonstrating enhanced electrochemical properties. Furthermore, a hybrid energy storage device was assembled using the NiCo₂O₄@NiWO₄/Ni foam as the positive terminal and activated carbon supported on Ni foam as the negative terminal. This device delivered an energy density of 60.5 Wh kg⁻¹ along with a power output of 850&#xa0;W kg⁻¹ at 1&#xa0;A g⁻¹. These findings confirm that the synergistic interaction within the composite material contributes to its effectiveness as a promising electrode candidate for advanced supercapacitor applications.</p>

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Synergistic integration of NiCo₂O₄ and NiWO₄ nanosheets on Ni foam for advanced supercapacitor applications

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • M. Dayanithy,
  • G. Chandra Sekhar,
  • R. C. Thivyarathi,
  • P. Divyabharathi,
  • Lakshmana Phaneendra Maguluri,
  • V. Saravanan

摘要

This research presents the development of nanoscale nickel–cobalt oxide (NiCo₂O₄) and nickel tungstate (NiWO₄) sheet-like structures, vertically grown on a pliable nickel foam through a hydrothermal synthesis process, followed by heat treatment. Structural and morphological characteristics of the NiCo₂O₄@NiWO₄/Ni foam architecture were explored using techniques such as, XRD, SEM and XPS. These ultrathin nanosheets were subsequently utilized as electrode materials for supercapacitor fabrication. The composite electrode exhibited an outstanding charge storage capacity of 1178 F g⁻¹ when tested at 1 A g⁻¹, and retained a high capacitance of 1101 F g⁻¹ at 5 A g⁻¹. Long-term stability testing revealed a capacitance retention of 93.4% after 5000 continuous charge–discharge cycles at the same current density. The hybrid system significantly outperformed electrodes made solely of NiCo₂O₄, demonstrating enhanced electrochemical properties. Furthermore, a hybrid energy storage device was assembled using the NiCo₂O₄@NiWO₄/Ni foam as the positive terminal and activated carbon supported on Ni foam as the negative terminal. This device delivered an energy density of 60.5 Wh kg⁻¹ along with a power output of 850 W kg⁻¹ at 1 A g⁻¹. These findings confirm that the synergistic interaction within the composite material contributes to its effectiveness as a promising electrode candidate for advanced supercapacitor applications.