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<p>Zeolitic imidazolate frameworks (ZIFs) have greatly attracted attention in supercapacitors research due to their porosity and structural controllability. In this paper, a series of Co–nitrogen carbon (Co–NCs) were obtained via a facile one-step calcination process using 3D star-shaped Co–ZIF as a precursor. The energy storage mechanism is analyzed and it is concluded that Co–NCs show excellent capacitance and cycling stability, attributed to its star-shaped porous morphology and high pseudocapacitance contribution. The optimized Co–NCs/550 exhibits a specific capacity of 825&#xa0;F&#xa0;g<sup>−1</sup> at a current density of 0.1&#xa0;A&#xa0;g<sup>−1</sup>, and a highly stable cycling performance over 5000 cycles at a current density of 2&#xa0;A&#xa0;g<sup>−1</sup>. This work provides a practical strategy for designing stable electrode for high-performance supercapacitors.</p>

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Construction of 3D star-shaped Co–NCs for high-performance supercapacitors

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Lun Qi,
  • Dan Tu,
  • Yu Shi,
  • Jingjing Liu,
  • Xinyuan Zhao,
  • Jianhua Xu,
  • Yajie Yang,
  • Wenyao Yang

摘要

Zeolitic imidazolate frameworks (ZIFs) have greatly attracted attention in supercapacitors research due to their porosity and structural controllability. In this paper, a series of Co–nitrogen carbon (Co–NCs) were obtained via a facile one-step calcination process using 3D star-shaped Co–ZIF as a precursor. The energy storage mechanism is analyzed and it is concluded that Co–NCs show excellent capacitance and cycling stability, attributed to its star-shaped porous morphology and high pseudocapacitance contribution. The optimized Co–NCs/550 exhibits a specific capacity of 825 F g−1 at a current density of 0.1 A g−1, and a highly stable cycling performance over 5000 cycles at a current density of 2 A g−1. This work provides a practical strategy for designing stable electrode for high-performance supercapacitors.