Tight Covalent Organic Framework Membranes for Efficient Anion Transport via Molecular Precursor Engineering

Yan Kong, Xueyi He, Hong Wu, Yi Yang, Li Cao, Runlai Li, Benbing Shi, Guangwei He, Yiqin Liu, Quan Peng, Chunyang Fan, Zhenjie Zhang, Zhongyi Jiang

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Fabricating covalent organic frameworks (COFs) membranes with tight structure, which can fully utilize well-defined framework structure and thus achieve superior conduction performance, remains a grand challenge. Herein, through molecular precursor engineering of COFs, we reported the fabrication of tight COFs membrane with the ever-reported highest hydroxide ion conductivity over 200 mS cm−1 at 80 °C, 100 % RH. Six quaternary ammonium-functionalized COFs were synthesized by assembling functional hydrazides and different aldehyde precursors. In an organic-aqueous reaction system, the impact of the aldehyde precursors with different size, electrophilicity and hydrophilicity on the reaction-diffusion process for fabricating COFs membranes was elucidated. Particularly, more hydrophilic aldehydes were prone to push the reaction zone from the interface region to the aqueous phase of the reaction system, the tight membranes were thus fabricated via phase-transfer polymerization process, conferring around 4–8 times the anion conductivity over the loose membranes via interfacial polymerization process.
Original languageEnglish (US)
Pages (from-to)17638-17646
Number of pages9
JournalAngewandte Chemie - International Edition
Volume60
Issue number32
DOIs
StatePublished - Aug 2 2021
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-21

ASJC Scopus subject areas

  • General Chemistry
  • Catalysis

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