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Enhanced supercapacitor performance using EG@COF: a layered porous composite.

Junaid Khan1,2,3, Anique Ahmed4, Abdullah A Al-Kahtani5

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Researchers developed a novel composite material (EG@COF) by growing a redox-active covalent organic framework (COF) on expanded graphite (EG). This material significantly enhances supercapacitor performance, offering high specific capacitance and excellent cycle stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Covalent Organic Frameworks (COFs) often suffer from poor electrical conductivity, limiting their application in energy storage.
  • Developing composite materials is crucial to overcome the intrinsic limitations of COFs and improve their electrochemical performance.

Purpose of the Study:

  • To synthesize a novel layered porous composite (EG@COF) by integrating a redox-active COF with expanded graphite (EG).
  • To investigate the structural and electrochemical properties of the EG@COF composite for supercapacitor applications.
  • To evaluate the performance of the composite as an electrode material in asymmetric supercapacitors.

Main Methods:

  • Solvent-free in situ synthesis of a DAAQ-TFP COF on expanded graphite (EG) to form the EG@COF composite.
  • Scanning Electron Microscopy (SEM) for structural and morphological analysis.
  • Electrochemical studies including specific capacitance measurements and cycle stability tests.
  • Fabrication and testing of an asymmetric supercapacitor (ACS) using EG@COF and activated carbon (AC).

Main Results:

  • The synthesized EG@COF composite exhibited a well-defined layered porous structure.
  • Expanded graphite (EG) enhanced the electrical conductivity and regulated the pore size of the COFs.
  • The EG@COF-3 composite achieved a high specific capacitance of 351 C g-1 at 1 A g-1.
  • The material demonstrated excellent capacitance retention of 94.4% after 10,000 cycles, attributed to the stable COF backbone.
  • An asymmetric supercapacitor (ACS) using EG@COF showed an energy density of 16.4 W h kg-1 at a power density of 806.0 W kg-1.

Conclusions:

  • The developed EG@COF composite effectively addresses the conductivity limitations of COFs.
  • The unique structure of EG@COF enhances specific capacitance and electrochemical stability for supercapacitor electrodes.
  • This composite material shows significant promise for high-performance energy storage devices.