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<p>Metal organic framework (MOF)–derived materials are considered to have great potential as electrode materials for supercapacitors. In this work, a ZnO/Co<sub>3</sub>O<sub>4</sub>/MnO<sub>2</sub> composite with a unique three-dimensional structure was synthesized by calcination and hydrothermal methods using Zeolitic Imidazolate Framework-8@Zeolitic Imidazolate Framework-67 (ZIF-8@ZIF-67) as a template. The synergistic effect between different metal oxides, the structure of MnO<sub>2</sub> nanoflower, and the abundant pore structure provide effective pathways for the rapid transfer of electrons and electrolyte ions. The specific capacitance of the prepared ZnO/Co<sub>3</sub>O<sub>4</sub>/MnO<sub>2</sub> reaches 840.6 F g<sup>−1</sup> at 0.5 A <sup>−1</sup>. The energy density of the symmetric supercapacitor prepared with this electrode material reaches 47.15 Wh kg<sup>−1</sup> at 499.97 W kg<sup>−1</sup>. After 1000 cycles at 5 A g<sup>−1</sup>, the material retains 97% capacitance retention and 100% coulombic efficiency, demonstrating exceptional cyclic stability and energy storage potential.</p>

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MnO2 nanoflower decorated on ZnO/Co3O4 derived from ZIF-8@ZIF-67 for high-performance supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Yanqiu Feng,
  • Yanxiang Wang,
  • Dongming Liu,
  • Deli Yang,
  • Yongbo Wang,
  • Bohan Ding,
  • Yue Sun,
  • Jinghe Guo,
  • Shichao Dai,
  • Zibo Jia,
  • Weihao Zong

摘要

Metal organic framework (MOF)–derived materials are considered to have great potential as electrode materials for supercapacitors. In this work, a ZnO/Co3O4/MnO2 composite with a unique three-dimensional structure was synthesized by calcination and hydrothermal methods using Zeolitic Imidazolate Framework-8@Zeolitic Imidazolate Framework-67 (ZIF-8@ZIF-67) as a template. The synergistic effect between different metal oxides, the structure of MnO2 nanoflower, and the abundant pore structure provide effective pathways for the rapid transfer of electrons and electrolyte ions. The specific capacitance of the prepared ZnO/Co3O4/MnO2 reaches 840.6 F g−1 at 0.5 A −1. The energy density of the symmetric supercapacitor prepared with this electrode material reaches 47.15 Wh kg−1 at 499.97 W kg−1. After 1000 cycles at 5 A g−1, the material retains 97% capacitance retention and 100% coulombic efficiency, demonstrating exceptional cyclic stability and energy storage potential.