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<p>The demand for supercapacitors with high energy and power densities has accelerated the search for efficient electrode materials. In this study, we prepared a binary composite of multi-walled carbon nanotubes (MWCNT) and nickel tungstate (NiWO<sub>4</sub>) using a simple hydrothermal method, achieving a specific capacitance of 885 F g<sup>−1</sup> at 1 A g<sup>−1</sup> with strong cyclic stability, maintaining 86% capacity after 5000 cycles. Electrochemical analysis revealed a shift in the charge storage mechanism of MWCNT/NiWO<sub>4</sub> composite with “<i>b</i>-values” of 0.84 to low indicating a capacitive-dominant behavior with increased scan rate likely due to the formation of a double-layer and the presence of MWCNTs. The composite exhibited enhanced conductivity with a charge transfer resistance (<i>R</i><sub>ct</sub>) of 0.9 Ω compared to 3.2 Ω for NiWO<sub>4</sub> alone. This study highlights the potential of MWCNT/NiWO<sub>4</sub> as a cost-effective, high-performance electrode material for next-generation supercapacitors.</p>

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Integration of NiWO4 nanoparticles with multi-walled carbon nanotubes for next-generation energy storage

  • 期刊论文

  • 发表日期：

    2025年2月22日

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  • R. Suganesh,
  • G. Venkatesh,
  • K. M. Prabu,
  • G. Periyasami,
  • M. Priyadharshini,
  • R. Ranjith,
  • K. L. Meghanathan

摘要

The demand for supercapacitors with high energy and power densities has accelerated the search for efficient electrode materials. In this study, we prepared a binary composite of multi-walled carbon nanotubes (MWCNT) and nickel tungstate (NiWO4) using a simple hydrothermal method, achieving a specific capacitance of 885 F g−1 at 1 A g−1 with strong cyclic stability, maintaining 86% capacity after 5000 cycles. Electrochemical analysis revealed a shift in the charge storage mechanism of MWCNT/NiWO4 composite with “b-values” of 0.84 to low indicating a capacitive-dominant behavior with increased scan rate likely due to the formation of a double-layer and the presence of MWCNTs. The composite exhibited enhanced conductivity with a charge transfer resistance (Rct) of 0.9 Ω compared to 3.2 Ω for NiWO4 alone. This study highlights the potential of MWCNT/NiWO4 as a cost-effective, high-performance electrode material for next-generation supercapacitors.