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Building Unit Engineering Toward COF Membranes with Controlled Stacking for H2 Purification.

Xiaohe Tian1, Haishan Huan1, Keming Zhang1

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This study introduces novel covalent organic framework (COF) membranes for efficient hydrogen purification. These membranes overcome limitations of traditional materials, offering high selectivity and processability for green energy applications.

Keywords:
COF membranehydrogen purificationinterlayer stackingpore tuning

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Conventional polymeric membranes face permeability-selectivity trade-offs and instability.
  • Covalent organic framework (COF) membranes show potential but suffer from large pores and poor processability.

Purpose of the Study:

  • To design and synthesize imine-based COF nanosheets using a ternary building unit system for programmable interlayer offsets.
  • To overcome the limitations of pore size and film-processibility in COF membranes for hydrogen purification.

Main Methods:

  • Synthesized imine-based COF nanosheets using a ternary building unit system with planar and non-planar aldehyde monomers.
  • Engineered interlayer stacking (AA to AB transitions) for angstrom-precise pore tuning (1.4-0.6 nm).
  • Fabricated large-area membranes via facile blade casting.

Main Results:

  • Achieved angstrom-precise pore tuning through controlled stacking transitions.
  • Demonstrated mechanically robust nanosheets with improved film-processibility.
  • Obtained exceptional H2/CO2 selectivity of 60, surpassing benchmarks.
  • Attained 99.5% H2 purity and 94.0% recovery in a two-stage process for methanol steam reforming gas mixtures.

Conclusions:

  • Ternary building unit system enables precise pore architecture modulation and enhanced mechanical flexibility in COF membranes.
  • Developed a viable platform for advanced microporous organic membranes for efficient hydrogen purification and green energy solutions.