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Mass Transport Based on Covalent Organic Frameworks.

Jianwei Yang1, Bo Wang1, Xiao Feng1

  • 1Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Frontiers Science Center for High Energy Material, Advanced Technology Research Institute (Jinan), School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

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Summary
This summary is machine-generated.

Covalent organic frameworks (COFs) enable efficient multisubstance transport, crucial for catalysis and energy applications. Advanced nanochannel engineering in COFs optimizes ion and molecular movement, enhancing reaction efficiency and fuel cell performance.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Chemistry

Background:

  • Mass transport is critical in biological and industrial processes, influencing reaction rates and energy conversion.
  • Crystalline porous materials like covalent organic frameworks (COFs) offer tunable nanochannels for controlled substance transport.
  • Understanding molecular-level mass transport in COFs is vital for advancing materials science and chemical applications.

Purpose of the Study:

  • To explore multisubstance cooperative transport mechanisms and structure-activity relationships in COFs for ions, water, and gases.
  • To summarize recent advances in COF-based ion and molecular transport, focusing on nanochannel construction and functional design.
  • To provide molecular design strategies for optimizing multisubstance transport across three-phase interfaces for enhanced catalytic efficiency and energy conversion.

Main Methods:

  • Development of novel COF linker chemistries, including irreversible α-aminoketone linkages and Suzuki coupling.
  • Implementation of strategies for achieving large pore sizes and highly oriented nanochannels (e.g., side-chain-induced dipole stacking, prenucleation, slow growth).
  • Exfoliation and interwoven strategies to accelerate ion transport; precise pore size engineering for gas separation membranes; design of open framework ionomers.

Main Results:

  • Achieved record large pore sizes and highly oriented nanochannels in COFs.
  • Demonstrated accelerated ion transport at interfaces and refined gas permeability through pore engineering.
  • Designed novel ionomers that synergistically enhance the transport of ions, water, and gas, boosting CO2 reduction and fuel cell power density.

Conclusions:

  • COF nanochannel engineering, including linkage, pore size, orientation, and functional gradients, is key to controlling mass transport.
  • Correlations between COF pore structure and transport properties enable applications in gas separation, energy storage, and catalysis.
  • Future opportunities lie in synthetic chemistry, elucidating complex transport mechanisms, and developing advanced applications for optimized energy conversion.