Hollow-Structured High-Entropy Metal Sulfide (Co,Ni,Cu,Zn,Mn)₃S₄ As An Efficient Supercapacitor Electrode

High-entropy sulfides, characterized by multiple metal cations, offer unique electronic and structural properties that make them promising candidates for energy storage applications. In this study, we successfully synthesized high-entropy sulfide (HES) (Co,Ni,Cu,Zn,Mn)3S4 with a hollow spherical morphology for the first time. The product exhibited such significant advantages as enhanced phase stability and synergistic effects, contributing to improved electrochemical performance. Its unique hollow mesoporous structure resulted in a high specific surface area and efficient ion transport pathways, which enhanced its electrochemical properties. As electrode materials for supercapacitors, HES demonstrated excellent capacitance (2052 F g–1 at 1 A g–1), robust cycle stability (81.3% after 5000 cycles), and efficient charge–discharge characteristics. Furthermore, the assembled asymmetric supercapacitor delivered a maximum energy density of 39.1 Wh kg–1 at a power density of 800 W kg–1, demonstrating its practical potential in high-performance energy storage applications. These findings highlight the potential of high-entropy sulfides for advanced electrochemical applications and provide a foundation for future research in high-entropy materials for energy storage and conversion.