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Updated: May 16, 2025

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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Three-Dimensional Covalent Organic Framework for Efficient Hydrogen Storage through Polarization-Wall Engineering.

Jia Chen1, Zhuozhuo Tang1, Da Zhu1

  • 1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.

Nano Letters
|April 3, 2025
PubMed
Summary
This summary is machine-generated.

Covalent organic frameworks (COFs) show promise for hydrogen storage. Polarized pore walls in 3D-F-COFs enhance hydrogen adsorption heat and uptake, offering a stable and efficient storage solution.

Keywords:
fluoridationhydrogen storagepolarization-wall engineeringsorption heatthree-dimensional covalent organic framework

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) possess high surface areas and tunable pores, making them attractive for hydrogen (H 2 ) storage.
  • Current COFs exhibit weak interactions with H 2 , limiting their sorption heat and overall storage capacity.
  • Enhancing the H 2 sorption heat is crucial for improving the efficiency of COF-based H 2 storage materials.

Purpose of the Study:

  • To engineer COFs with enhanced H 2 adsorption properties through polarized wall modification.
  • To investigate the effect of fluorine incorporation on the H 2 interaction within COF pore structures.
  • To evaluate the H 2 uptake capacity and cycling stability of the modified COFs.

Main Methods:

  • Synthesis of three-dimensional COFs with fluorine-incorporated pore walls (3D-F-COF).
  • Characterization of the COFs' structural and chemical properties.
  • Measurement of H 2 adsorption isotherms at cryogenic temperatures (77 K) and high pressures (90 bar).

Main Results:

  • Fluorine groups on the pore walls of 3D-F-COFs create polarized regions, enhancing H 2 sorption heat.
  • The 3D-F-COF material achieved a total H 2 uptake of 5.96 wt % at 77 K and 90 bar.
  • The H 2 adsorption enhancement was attributed to physisorption, with no evidence of chemisorption, and the material demonstrated excellent cycling stability.

Conclusions:

  • Polarized wall engineering by incorporating fluorine groups is an effective strategy to increase H 2 sorption heat in COFs.
  • This approach significantly enhances H 2 uptake capacity in COFs without compromising material stability.
  • Modulating sorption heat through polar group incorporation offers a promising pathway for developing advanced porous materials for efficient H 2 storage.