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Network Covalent Solids02:18

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Sulfonated 2D Covalent Organic Frameworks for Efficient Proton Conduction.

Zongfan Yang1, Pei Chen1, Wenjing Hao1

  • 1Department of Chemistry, Institute of Molecular Plus, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 2, 2020
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Summary

Researchers engineered covalent organic frameworks (COFs) with modified pore walls and integrated polymers to create stable, high-rate proton conduction systems for advanced energy applications.

Keywords:
covalent organic frameworkspost-synthesisproton conductionstabilitysulfonation

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) with open 1D channels show promise for proton conduction.
  • Developing stable, high-rate proton transport systems in COFs remains a significant challenge.

Purpose of the Study:

  • To develop a strategy for creating advanced proton-conducting frameworks.
  • To engineer pore walls and incorporate proton-conducting polymers within COF channels.

Main Methods:

  • Synthesized amide-linked and sulfonated COFs from imine-linked precursors.
  • Engineered pore walls via oxidation and sulfonic acid group anchoring.
  • Integrated sulfonated polyether ether ketone chains into the COF channels.

Main Results:

  • Achieved highly crystalline sulfonated COFs with ordered channels.
  • Demonstrated enhanced proton hopping across channels via polymer integration.
  • Significantly increased proton conductivity and stable continuous operation.

Conclusions:

  • Systematic engineering of COF pore walls and nanochannels is a viable strategy for developing proton-conducting materials.
  • The developed COFs show potential for applications requiring efficient and stable proton transport.