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<p>The development of advanced electrode materials with high electrochemical performance is crucial for next-generation energy storage devices. In this study, ZIF-8 and ZIF-67-supported carbon nano-onions (CNOs) were prepared using a sustainable approach, utilizing waste flaxseed oil as a carbon source. A simple yet effective pyrolysis and activation process enabled the formation of highly porous carbon structures with embedded zeolitic imidazolate frameworks (ZIFs), enhancing both conductivity and ion transport properties. Structural and morphological characterizations confirmed a well-defined porous architecture, improved surface area, and optimized pore size distribution, all of which contribute to superior electrochemical performance. The CNO/ZIF-67 electrode exhibited a specific capacitance of 564 F g<sup>−1</sup> at a current density of 2 A g<sup>−1</sup> in a three-electrode system using a 1&#xa0;M H<sub>2</sub>SO<sub>4</sub> aqueous electrolyte. The synergistic effect of CNOs and ZIFs enhances charge storage through a combination of electrical double-layer capacitance and fast redox reactions, making these materials highly suitable for supercapacitor applications. Furthermore, a symmetric supercapacitor utilizing this material maintains 89% of its initial capacitance after 5000 galvanostatic charge–discharge cycles, demonstrating significant durability and practical applicability. This work underscores the potential of waste-derived carbon nanomaterials in sustainable energy storage solutions while demonstrating the effectiveness of metal–organic frameworks (MOFs) in optimizing electrochemical properties.</p>

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Synthesis and characterization of Zeolitic imidazole framework (8 and 67) supported carbon nano-onions derived from waste flaxseed oil for high-performance supercapacitor

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Pooja Kadyan,
  • Sonia Grover,
  • Sakshi Sharma,
  • Naveen Kumar,
  • Kirti Sharma,
  • Raj Kishore Sharma

摘要

The development of advanced electrode materials with high electrochemical performance is crucial for next-generation energy storage devices. In this study, ZIF-8 and ZIF-67-supported carbon nano-onions (CNOs) were prepared using a sustainable approach, utilizing waste flaxseed oil as a carbon source. A simple yet effective pyrolysis and activation process enabled the formation of highly porous carbon structures with embedded zeolitic imidazolate frameworks (ZIFs), enhancing both conductivity and ion transport properties. Structural and morphological characterizations confirmed a well-defined porous architecture, improved surface area, and optimized pore size distribution, all of which contribute to superior electrochemical performance. The CNO/ZIF-67 electrode exhibited a specific capacitance of 564 F g−1 at a current density of 2 A g−1 in a three-electrode system using a 1 M H2SO4 aqueous electrolyte. The synergistic effect of CNOs and ZIFs enhances charge storage through a combination of electrical double-layer capacitance and fast redox reactions, making these materials highly suitable for supercapacitor applications. Furthermore, a symmetric supercapacitor utilizing this material maintains 89% of its initial capacitance after 5000 galvanostatic charge–discharge cycles, demonstrating significant durability and practical applicability. This work underscores the potential of waste-derived carbon nanomaterials in sustainable energy storage solutions while demonstrating the effectiveness of metal–organic frameworks (MOFs) in optimizing electrochemical properties.