Building Unit Engineering Toward COF Membranes with Controlled Stacking for H2 Purification
© 2025 Wiley‐VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 37(2025), 32 vom: 06. Aug., Seite e2504622 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article COF membrane hydrogen purification interlayer stacking pore tuning |
| Zusammenfassung: | © 2025 Wiley‐VCH GmbH. Hydrogen purification by membrane technology offers a sustainable path to meet the escalating demands of green energy. However, conventional polymeric membranes are constrained by permeability-selectivity trade-off and instability under real-world operating conditions. While covalent organic framework (COF) membranes hold promise, their overlarge pores and poor film-processibility are to be imperatively solved. Herein, a ternary building unit system is designed for synthesizing imine-based COF nanosheets with programmable interlayer offsets. By synergizing a planar aldehyde monomer as the basic structural unit and a none-planar alkyl-functionalized aldehyde monomer as the structure regulation unit, we induce layer distortion that disrupts π-π dominated AA stacking, enabling angstrom-precise pore tuning (1.4-0.6 nm) via controlled transitions to AB stacking while retaining crystallinity. The mechanically robust nanosheets are easily assembled into large-area membranes via a facile blade casting, overcoming the processability bottleneck associated with binary building unit systems. The resulting membranes demonstrate an exceptional H2/CO2 selectivity of 60, surpassing existing benchmarks. When treating gas mixtures from methanol steam reforming, a two-stage membrane process achieves 99.5% H2 purity and 94.0% recovery. Precise modulation of pore architecture and mechanical flexibility through building units engineered stacking affords a platform for microporous organic membranes |
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| Beschreibung: | Date Revised 15.08.2025 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202504622 |