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<p>This study employed a stepwise hydrothermal-calcination strategy to in situ construct a three-dimensional nanosheet-like CoMoO<sub>₄</sub>@NiO heterojunction on foam nickel, serving as a high-performance pseudocapacitive electrode. This unique hierarchical structure provides abundant active sites and excellent ion transport pathways. The prepared electrode exhibits a high specific capacitance of 1796.8 F g⁻<sup>1</sup> (at 1 A g⁻<sup>1</sup>) and outstanding cycling stability (95.7% capacity retention after 5000 cycles). Based on this, the assembled CoMoO<sub>₄</sub>@NiO//AC asymmetric supercapacitor device exhibits a wide voltage window of 1.7&#xa0;V, achieving an energy density of 62.39 Wh kg⁻<sup>1</sup> and a corresponding power density of 6250 W kg⁻<sup>1</sup>. It maintains 82.3% of its initial capacity after extended cycling. The significant performance enhancement stems from the synergistic effects between CoMoO<sub>₄</sub> and NiO. This composite structure effectively modulates the interfacial electronic structure, optimizes charge transfer dynamics, and promotes ion diffusion. It provides a modification strategy for next-generation cathode materials.</p>

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In situ growth of CoMoO₄@NiO heterojunction on nickel foam with 3D flower-like architecture for high-performance asymmetric supercapacitors

  • 期刊论文

  • 发表日期：

    2026年1月18日

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  • Xiongzhi Li,
  • Ya Qi Wang,
  • Xiao Qian Wang,
  • Kejia Shi,
  • Chao Yu,
  • Fan Bin Meng,
  • Yujie Zhang

摘要

This study employed a stepwise hydrothermal-calcination strategy to in situ construct a three-dimensional nanosheet-like CoMoO₄@NiO heterojunction on foam nickel, serving as a high-performance pseudocapacitive electrode. This unique hierarchical structure provides abundant active sites and excellent ion transport pathways. The prepared electrode exhibits a high specific capacitance of 1796.8 F g⁻1 (at 1 A g⁻1) and outstanding cycling stability (95.7% capacity retention after 5000 cycles). Based on this, the assembled CoMoO₄@NiO//AC asymmetric supercapacitor device exhibits a wide voltage window of 1.7 V, achieving an energy density of 62.39 Wh kg⁻1 and a corresponding power density of 6250 W kg⁻1. It maintains 82.3% of its initial capacity after extended cycling. The significant performance enhancement stems from the synergistic effects between CoMoO₄ and NiO. This composite structure effectively modulates the interfacial electronic structure, optimizes charge transfer dynamics, and promotes ion diffusion. It provides a modification strategy for next-generation cathode materials.