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<p>Nickel cobalt sulphide (NiCo<sub>2</sub>S<sub>4</sub>) is a promising battery-type electrode material due to its high theoretical capacitance and rich redox activity. However, its poor electrical conductivity and structural instability hinder practical application. Incorporation of two-dimensional (2D) Ti<sub>3</sub>C<sub>2</sub> MXene can address these issues by improving conductivity and mechanical integrity. While previous studies have explored the synergistic effects of Ti<sub>3</sub>C<sub>2</sub> and NiCo<sub>2</sub>S<sub>4</sub>, the influence of MXene exfoliation state and morphology control on electrochemical performance remains underexplored. Herein, we report a one-step hydrothermal synthesis of delaminated Ti<sub>3</sub>C<sub>2</sub>@NiCo<sub>2</sub>S<sub>4</sub> (d-Ti<sub>3</sub>C<sub>2</sub>@NiCo<sub>2</sub>S<sub>4</sub>) composites with tunable morphology by varying hydrothermal time (4–48&#xa0;h). Among them, the 24 h sample (d-Ti<sub>3</sub>C<sub>2</sub>@NiCo<sub>2</sub>S<sub>4</sub>-24) featuring a hexagonal layered platelet structure exhibits superior performance, delivering 161.94&#xa0;mAh&#xa0;g<sup>−1</sup> (1165&#xa0;F&#xa0;g<sup>−1</sup>) at 1&#xa0;A&#xa0;g<sup>−1</sup>, with ~ 81% rate capability at 5&#xa0;A&#xa0;g<sup>−1</sup> and 85% capacity retention over 20,000 cycles. It significantly outperforms both bare NiCo<sub>2</sub>S<sub>4</sub>-24 and the multilayer Ti<sub>3</sub>C<sub>2</sub>-based composite. The asymmetric device (d-Ti<sub>3</sub>C<sub>2</sub>@NiCo<sub>2</sub>S<sub>4</sub>-24//AC) delivers 19.88&#xa0;Wh&#xa0;kg<sup>−1</sup> at 399.82&#xa0;W&#xa0;kg<sup>−1</sup> with 86% retention after 9000 cycles, demonstrating excellent potential for practical energy storage applications.</p>

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Ti3C2-Mxene-dispersion and morphology controlled battery-type nickel cobalt sulphide based nanocomposites for the application as aqueous asymmetric supercapacitor with improved rate

  • 期刊论文

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  • 发表日期：

    2025年11月24日

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  • Abhinaba Das,
  • Arnab Samanta Roy Choudhury,
  • Pallab Bhattacharya

摘要

Nickel cobalt sulphide (NiCo2S4) is a promising battery-type electrode material due to its high theoretical capacitance and rich redox activity. However, its poor electrical conductivity and structural instability hinder practical application. Incorporation of two-dimensional (2D) Ti3C2 MXene can address these issues by improving conductivity and mechanical integrity. While previous studies have explored the synergistic effects of Ti3C2 and NiCo2S4, the influence of MXene exfoliation state and morphology control on electrochemical performance remains underexplored. Herein, we report a one-step hydrothermal synthesis of delaminated Ti3C2@NiCo2S4 (d-Ti3C2@NiCo2S4) composites with tunable morphology by varying hydrothermal time (4–48 h). Among them, the 24 h sample (d-Ti3C2@NiCo2S4-24) featuring a hexagonal layered platelet structure exhibits superior performance, delivering 161.94 mAh g−1 (1165 F g−1) at 1 A g−1, with ~ 81% rate capability at 5 A g−1 and 85% capacity retention over 20,000 cycles. It significantly outperforms both bare NiCo2S4-24 and the multilayer Ti3C2-based composite. The asymmetric device (d-Ti3C2@NiCo2S4-24//AC) delivers 19.88 Wh kg−1 at 399.82 W kg−1 with 86% retention after 9000 cycles, demonstrating excellent potential for practical energy storage applications.