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Large Multichannel Architectures in Three-Dimensional Covalent Organic Frameworks for Efficient Guest Diffusion.

Chenxi Xiong1, Hui Zhou2, Jiaming Zhou2

  • 1Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong SAR, China.

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|April 13, 2026
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Summary
This summary is machine-generated.

New 3D covalent organic frameworks (COFs) with interconnected channels overcome diffusion limitations. These materials enable efficient lithium-ion transport, comparable to liquid electrolytes, for advanced energy storage applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Guest diffusion in covalent organic frameworks (COFs) is hindered by structural defects like misaligned layers and discontinuous channels.
  • These limitations restrict the performance of COFs in applications requiring efficient ion transport.

Purpose of the Study:

  • To develop novel 3D COFs that mitigate diffusion limitations.
  • To investigate the impact of interconnected channels and tunable functionality on ion transport.

Main Methods:

  • Synthesis of triptycene-based 3D COFs (HKU-2-PEGn) with orthogonally interconnected channels.
  • Characterization of channel structure, including width and connectivity.
  • Measurement of lithium-ion (Li+) diffusion coefficients in bulk COF samples.

Main Results:

  • The synthesized HKU-2-PEGn COFs possess wide channels (up to 4.8 nm) and numerous interconnected pathways facilitating diffusion.
  • High Li+ diffusion coefficients were observed across various Li+ concentrations.
  • The performance rivaled that of commercial liquid electrolytes.

Conclusions:

  • Large, multichannel crystalline architectures in 3D COFs effectively overcome diffusion anisotropy.
  • These advanced COFs show significant promise for applications in energy storage, particularly for solid-state electrolytes.