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<p>The growing demand for efficient and durable energy storage devices has propelled interest in ternary transition metal sulfides due to their versatile redox chemistry and cost-effectiveness. Nevertheless, their performance is often hindered by limited electrical conductivity. In this study, a hollow-spherical Iron Nickel Sulfide (FeNi<sub>2</sub>S<sub>4</sub>) material was synthesized using a simple solvothermal strategy and subsequently combined with exfoliated graphite (EG) to form a hybrid composite. This integration significantly enhanced the specific capacitance from 159.4 to 342&#xa0;F g<sup>-1</sup> at 1&#xa0;A g<sup>-1</sup>, while also improving the cycling stability. After 10,000 charge-discharge cycles, the electrode composite retained 92.3% of its initial capacitance while maintaining a coulombic efficiency of approximately 95.1%. Furthermore, the assembled FNSEG1//AC device delivers an energy density of 35 Wh kg<sup>-1</sup> at 800&#xa0;W kg<sup>-1</sup>, with a peak power density of 12,800&#xa0;W kg<sup>-1</sup>, while maintaining 81.6% of initial capacitance after 5,000 stability cycles. The stability of FeNi<sub>2</sub>S<sub>4</sub> is attributed to its cooperative effect with the conductive exfoliated graphite network, highlighting its potential for next-generation energy storage systems.</p>

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Innovative hollow FeNi2S4 decorated on exfoliated graphite as an efficient electrode material for asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Amardeep Narwal,
  • Kanhaiya Lal Yadav

摘要

The growing demand for efficient and durable energy storage devices has propelled interest in ternary transition metal sulfides due to their versatile redox chemistry and cost-effectiveness. Nevertheless, their performance is often hindered by limited electrical conductivity. In this study, a hollow-spherical Iron Nickel Sulfide (FeNi2S4) material was synthesized using a simple solvothermal strategy and subsequently combined with exfoliated graphite (EG) to form a hybrid composite. This integration significantly enhanced the specific capacitance from 159.4 to 342 F g-1 at 1 A g-1, while also improving the cycling stability. After 10,000 charge-discharge cycles, the electrode composite retained 92.3% of its initial capacitance while maintaining a coulombic efficiency of approximately 95.1%. Furthermore, the assembled FNSEG1//AC device delivers an energy density of 35 Wh kg-1 at 800 W kg-1, with a peak power density of 12,800 W kg-1, while maintaining 81.6% of initial capacitance after 5,000 stability cycles. The stability of FeNi2S4 is attributed to its cooperative effect with the conductive exfoliated graphite network, highlighting its potential for next-generation energy storage systems.