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Updated: Aug 17, 2025

Construction and Implementation of Carbon Fiber Microelectrode Arrays for Chronic and Acute In Vivo Recordings
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COF-Based Electrodes with Vertically Supported Tentacle Array for Ultrahigh Stability Flexible Energy Storage.

Yuanyuan He1, Ning An2,3, Congcong Meng1,4

  • 1Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.

ACS Applied Materials & Interfaces
|December 16, 2022
PubMed
Summary

This study developed advanced covalent organic frameworks (COFs) on carbon fibers for high-performance energy storage. The novel tentacle-like COF arrays significantly boost capacitance and stability in flexible supercapacitors.

Keywords:
all-solid-state symmetric supercapacitorcovalent organic frameworksenergy storageflexiblestability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) offer high porosity and stability but suffer from low active site utilization in powder form.
  • Integrating COFs onto conductive substrates is crucial for enhancing their performance in energy storage devices.
  • Current methods often result in weak binding and aggregation, limiting charge transfer efficiency.

Purpose of the Study:

  • To develop a novel method for integrating redox-active COFs onto carbon fiber surfaces.
  • To enhance the active site utilization and electrochemical performance of COFs for energy storage applications.
  • To create high-performance flexible all-solid-state supercapacitors using the modified COFs.

Main Methods:

  • Synthesized covalent organic frameworks (COFs) with 2,6-diaminoanthraquinone (DAAQ) pillars on carbon fiber surfaces via strong covalent bridging.
  • Utilized DAAQ pillars to control COF growth direction, forming tentacle-like arrays vertically supported on carbon fibers.
  • Fabricated flexible all-solid-state symmetric supercapacitors using PVA/H2SO4 gel electrolyte.

Main Results:

  • Achieved a high specific capacitance of 1034 mF cm-2 for the AC-COFs electrode due to strong covalent coupling and increased accessible active sites.
  • Demonstrated excellent stability with 98% capacitance retention after 20,000 charge-discharge cycles.
  • Fabricated a flexible supercapacitor with an areal capacitance of 715 mF cm-2, capable of powering a red LED.

Conclusions:

  • The innovative synthesis strategy effectively overcomes the limitations of traditional COF powder forms.
  • Vertically aligned, tentacle-like COF arrays on carbon fibers significantly enhance charge transfer and device performance.
  • This approach opens new avenues for developing high-performance flexible energy storage devices based on COFs.