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<p>High-entropy sulfides (HES) have garnered significant attention for energy storage applications owing to their unique electrochemical performance, driven by the cocktail effect and highly customizable chemical compositions. However, synthesizing HES compounds remains challenging due to the thermodynamic incompatibility of multiple metal elements within the HES structure. Herein, we has successfully synthesized HES of (FeCoNiCuZn)<sub>0.2</sub>S<sub>2</sub> electrode materials using a templated solvothermal method. The structure and composition of the (FeCoNiCuZn)<sub>0.2</sub>S<sub>2</sub> are characterized through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen adsorption–desorption isothermal methods. We further evaluate the electrochemical performance of these HES electrode materials, with the HES-160-8 electrode material demonstrating a specific capacitance of 476&#xa0;F/g at a current density of 1&#xa0;A/g in a three-electrode system. When assembled into an asymmetric supercapacitor (ASC) device using activated carbon (AC) as the counter electrode, the HES-160-8//AC ASC achieves a specific energy density of 30.88&#xa0;Wh/kg and a specific power density of 2880 W/kg. Notably, after undergoing 1000 cycles, the ASC device retains approximately 98% of its initial capacitance and a coulombic efficiency of up to 99%. This work provides valuable insights into developing high-performance HES electrode materials for supercapacitors.</p> Graphical abstract <p></p>

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High-entropy metal sulfides (FeCoNiCuZn)0.2S2 hollow spheres as electrode materials for battery-type supercapacitors

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Hanyu Yang,
  • Kang Chen,
  • Kangkang Wang,
  • Yuling Dai,
  • Zhao Zhang,
  • Huidong Xie

摘要

High-entropy sulfides (HES) have garnered significant attention for energy storage applications owing to their unique electrochemical performance, driven by the cocktail effect and highly customizable chemical compositions. However, synthesizing HES compounds remains challenging due to the thermodynamic incompatibility of multiple metal elements within the HES structure. Herein, we has successfully synthesized HES of (FeCoNiCuZn)0.2S2 electrode materials using a templated solvothermal method. The structure and composition of the (FeCoNiCuZn)0.2S2 are characterized through X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen adsorption–desorption isothermal methods. We further evaluate the electrochemical performance of these HES electrode materials, with the HES-160-8 electrode material demonstrating a specific capacitance of 476 F/g at a current density of 1 A/g in a three-electrode system. When assembled into an asymmetric supercapacitor (ASC) device using activated carbon (AC) as the counter electrode, the HES-160-8//AC ASC achieves a specific energy density of 30.88 Wh/kg and a specific power density of 2880 W/kg. Notably, after undergoing 1000 cycles, the ASC device retains approximately 98% of its initial capacitance and a coulombic efficiency of up to 99%. This work provides valuable insights into developing high-performance HES electrode materials for supercapacitors.

Graphical abstract