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<p>The interfacial chemical bonding strategy has been proposed by utilizing the expanded graphite (EG) as substrate to overcome the inherent low conductivity of covalent organic frameworks (COFs) in supercapacitor in this work. A redox-active COF material grows in situ on the EG surface through a solvent-free synthesis method, successfully constructing a novel layered porous EG@COF composite. Analysis results of BET, XPS and resistivity of materials demonstrate that the EG@COF not only preserves the intrinsic high specific surface area of COFs, but also effectively reduces interfacial contact resistance via amidation reaction, significantly enhancing charge transfer efficiency. Electrochemical studies reveal that the optimized EG@COF-3 electrode has a high specific capacitance of 501&#xa0;F g<sup>− 1</sup> at 1&#xa0;A g<sup>− 1</sup>, with 92.3% capacity retention after 10,000 cycles, demonstrating a good cycling stability. Furthermore, the assembled EG@COF//AC asymmetric supercapacitor achieves an energy density of 16.4 Wh kg<sup>− 1</sup> at a power density of 806.0&#xa0;W kg<sup>− 1</sup>. This work provides an effective solution to improve the conductivity of COF materials.</p>

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EG@COF as a novel layered porous composite for improving performance of supercapacitor

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Yulin Feng,
  • Fen Xu,
  • Lixian Sun,
  • Qiwei Shao,
  • Rudan Xu,
  • Yue Chen,
  • Chuyu Yu,
  • Maozhan Du,
  • Yingguang Xie

摘要

The interfacial chemical bonding strategy has been proposed by utilizing the expanded graphite (EG) as substrate to overcome the inherent low conductivity of covalent organic frameworks (COFs) in supercapacitor in this work. A redox-active COF material grows in situ on the EG surface through a solvent-free synthesis method, successfully constructing a novel layered porous EG@COF composite. Analysis results of BET, XPS and resistivity of materials demonstrate that the EG@COF not only preserves the intrinsic high specific surface area of COFs, but also effectively reduces interfacial contact resistance via amidation reaction, significantly enhancing charge transfer efficiency. Electrochemical studies reveal that the optimized EG@COF-3 electrode has a high specific capacitance of 501 F g− 1 at 1 A g− 1, with 92.3% capacity retention after 10,000 cycles, demonstrating a good cycling stability. Furthermore, the assembled EG@COF//AC asymmetric supercapacitor achieves an energy density of 16.4 Wh kg− 1 at a power density of 806.0 W kg− 1. This work provides an effective solution to improve the conductivity of COF materials.