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<p>Supercapacitors show great promise for alleviating the energy crisis due to their unique energy storage mechanism. Developing high-performance electrode materials is critical to meet the increasing demand for efficient supercapacitors. In this work, FeNiSb medium-entropy alloy (MEA) nanoparticles were rapidly synthesized on nickel foam (NF) via a one-step microwave-assisted method. Owing to the uniformly distributed nanostructure and the synergistic electronic effects among multiple principal elements, the FeNiSb electrode provided abundant electroactive sites and fast ion-transport kinetics, resulting in good charge storage performance. The optimized electrode delivered a high specific capacity of 1487.2&#xa0;C g<sup>− 1</sup> at 1&#xa0;A g<sup>− 1</sup> and exhibited stable cycling performance with 80.3% capacity retention after 10 000 cycles. Moreover, a symmetric supercapacitor (SSC) assembled using identical FeNiSb electrodes achieved a high energy density of 97.5 Wh kg<sup>− 1</sup> at 750.2&#xa0;W kg<sup>− 1</sup>. This study successfully employed FeNiSb MEA for SSC, demonstrating outstanding electrochemical performance and providing a viable solution for designing advanced energy storage materials.</p>

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Microwave synthesis of FeNiSb medium-entropy alloy as a high-performance electrode for symmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Weiwei Zhao,
  • Xue Wang,
  • Shuai Zhang,
  • Shuangyi He,
  • Jujie Luo

摘要

Supercapacitors show great promise for alleviating the energy crisis due to their unique energy storage mechanism. Developing high-performance electrode materials is critical to meet the increasing demand for efficient supercapacitors. In this work, FeNiSb medium-entropy alloy (MEA) nanoparticles were rapidly synthesized on nickel foam (NF) via a one-step microwave-assisted method. Owing to the uniformly distributed nanostructure and the synergistic electronic effects among multiple principal elements, the FeNiSb electrode provided abundant electroactive sites and fast ion-transport kinetics, resulting in good charge storage performance. The optimized electrode delivered a high specific capacity of 1487.2 C g− 1 at 1 A g− 1 and exhibited stable cycling performance with 80.3% capacity retention after 10 000 cycles. Moreover, a symmetric supercapacitor (SSC) assembled using identical FeNiSb electrodes achieved a high energy density of 97.5 Wh kg− 1 at 750.2 W kg− 1. This study successfully employed FeNiSb MEA for SSC, demonstrating outstanding electrochemical performance and providing a viable solution for designing advanced energy storage materials.