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<p>A novel high-entropy spinel oxide, (MnFeCoCuZn)<sub>3</sub>O<sub>4</sub>, was synthesized via a solid-state reaction. This study focuses on how different grinding aids affect the structural evolution and electrochemical performance of the material. The results demonstrate that the use of deionized water as a grinding aid (HEO-1) significantly improves precursor dispersion during ball milling. This improvement promotes the formation of a homogeneous single-phase spinel structure with submicron particles and reduced agglomeration. The enhanced electrochemical performance of HEO-1 is mainly attributed to its well-crystallized spinel structure, improved particle dispersion, multiple redox-active cations, and oxygen-vacancy-related surface defect sites. In a three-electrode configuration, the HEO-1 electrode delivered a specific capacitance of 697.8&#xa0;F g<sup>− 1</sup> at a current density of 1&#xa0;A g<sup>− 1</sup>. Furthermore, the assembled asymmetric supercapacitor (ASC) achieved an energy density of 69.88 Wh kg<sup>− 1</sup> at a power density of 750&#xa0;W kg<sup>− 1</sup> and retained 92.03% of its capacitance after 5,000 cycles. These findings highlight a cost-effective route for the fabrication of high-performance energy-storage materials through the combination of solid-state synthesis and optimized wet-milling.</p>

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Water-assisted solid-state synthesis of spinel (MnFeCoCuZn)3O4 high-entropy oxide for high-performance asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Zilong Zhou,
  • Fanen Zeng,
  • Zihao Zhang,
  • Zijing Tian,
  • Zhidong Sun,
  • Bing Xu

摘要

A novel high-entropy spinel oxide, (MnFeCoCuZn)3O4, was synthesized via a solid-state reaction. This study focuses on how different grinding aids affect the structural evolution and electrochemical performance of the material. The results demonstrate that the use of deionized water as a grinding aid (HEO-1) significantly improves precursor dispersion during ball milling. This improvement promotes the formation of a homogeneous single-phase spinel structure with submicron particles and reduced agglomeration. The enhanced electrochemical performance of HEO-1 is mainly attributed to its well-crystallized spinel structure, improved particle dispersion, multiple redox-active cations, and oxygen-vacancy-related surface defect sites. In a three-electrode configuration, the HEO-1 electrode delivered a specific capacitance of 697.8 F g− 1 at a current density of 1 A g− 1. Furthermore, the assembled asymmetric supercapacitor (ASC) achieved an energy density of 69.88 Wh kg− 1 at a power density of 750 W kg− 1 and retained 92.03% of its capacitance after 5,000 cycles. These findings highlight a cost-effective route for the fabrication of high-performance energy-storage materials through the combination of solid-state synthesis and optimized wet-milling.