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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Recent Progress in Covalent Organic Frameworks for Cathode Materials.

Chi Wang1, Yuchao Tian1, Wuhong Chen1

  • 1College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China.

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|March 13, 2024
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Summary
This summary is machine-generated.

Covalent organic frameworks (COFs) with redox-active groups show promise for energy storage. This review categorizes these materials by functional groups, detailing their structure, capacity, and voltage for cathode applications.

Keywords:
COFsactive sitesbatteriescathodereviewsynthesis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Covalent organic frameworks (COFs) are polymers built from organic molecules linked by reversible covalent bonds.
  • COFs offer tunable pore sizes and ordered structures, beneficial for ion transport in energy storage.
  • Redox-active COFs are emerging as promising cathode materials, but their energy density requires improvement.

Purpose of the Study:

  • To review recent advancements in redox-active COFs for energy storage applications.
  • To categorize COFs based on their redox-active functional groups.
  • To summarize key properties including structure, synthesis, surface area, specific capacity, and voltage.

Main Methods:

  • Literature review of COFs containing redox-active functional groups (-C=O-, -C=N-, -N=N-).
  • Classification of COFs into six subcategories based on distinct active functional groups.
  • Compilation of data on structural characteristics, synthesis units, specific surface area, specific capacity, and voltage range.

Main Results:

  • Identified six distinct subcategories of redox-active COFs based on functional groups.
  • Detailed the structure-property relationships influencing performance in cathode applications.
  • Highlighted that current COF cathode voltages (2-3 V vs. Li) offer room for enhancement, with research focusing on increasing specific capacity via more active sites.

Conclusions:

  • Redox-active COFs present a versatile platform for high-performance energy storage.
  • Systematic categorization aids in understanding and designing COFs for specific applications.
  • Further research is needed to enhance the voltage output and overall energy density of COF-based cathodes.