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<p>Despite stability problems, the zeolitic imidazole framework (ZIF) shows potential as an energy storage candidate owing to its valence shells, large theoretical specific capacitance, porous nature with vast surface area, and changeable redox characteristics. This study introduces calcium phosphates with exceptional stability and a wide window to enhance the cycle stability and voltage range of ZIF, due to the solid chemical properties along with inductive effects of the P-O bond. A performance comparison among the ZIF-67(Co) and cobalt and nickel substituted ZIF-8, after forming composites with hydroxyapatite (HAp), graphene oxide (GO) and PVDF, is done in this work. The most efficient composite electrodes are analysed within an asymmetrical 2-electrode solid-state system. This system achieves an impressive capacitance of 88.43&#xa0;F/g, delivering a significant power density (PD) of&#xa0;1.4&#xa0;kW/kg and an energy density (ED) of 27.5 Wh/kg at 1&#xa0;A/g. Moreover, the configuration provides a wide operating window of 2.8&#xa0;V. Additionally, after 2000 cycles, the device maintains an outstanding capacitance retention of 122%.</p>

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Metallic ions and calcium phosphates to improve the performance of zeolitic framework-based supercapacitors

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Georlin George,
  • Govardhan Karunanidhi,
  • Abin Philip,
  • A. Ruban Kumar,
  • K. E. Rakesh

摘要

Despite stability problems, the zeolitic imidazole framework (ZIF) shows potential as an energy storage candidate owing to its valence shells, large theoretical specific capacitance, porous nature with vast surface area, and changeable redox characteristics. This study introduces calcium phosphates with exceptional stability and a wide window to enhance the cycle stability and voltage range of ZIF, due to the solid chemical properties along with inductive effects of the P-O bond. A performance comparison among the ZIF-67(Co) and cobalt and nickel substituted ZIF-8, after forming composites with hydroxyapatite (HAp), graphene oxide (GO) and PVDF, is done in this work. The most efficient composite electrodes are analysed within an asymmetrical 2-electrode solid-state system. This system achieves an impressive capacitance of 88.43 F/g, delivering a significant power density (PD) of 1.4 kW/kg and an energy density (ED) of 27.5 Wh/kg at 1 A/g. Moreover, the configuration provides a wide operating window of 2.8 V. Additionally, after 2000 cycles, the device maintains an outstanding capacitance retention of 122%.