Assembling covalent organic framework membranes with superior ion exchange capacity

Xiaoyao Wang, Benbing Shi, Hao Yang, Jingyuan Guan, Xu Liang, Chunyang Fan, Xinda You, Yanan Wang, Zhe Zhang, Hong Wu, Tao Cheng, Runnan Zhang () and Zhongyi Jiang ()
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Xiaoyao Wang: Tianjin University
Benbing Shi: Tianjin University
Hao Yang: Soochow University
Jingyuan Guan: Tianjin University
Xu Liang: Tianjin University
Chunyang Fan: Tianjin University
Xinda You: Tianjin University
Yanan Wang: Tianjin University
Zhe Zhang: Soochow University
Hong Wu: Tianjin University
Tao Cheng: Soochow University
Runnan Zhang: Tianjin University
Zhongyi Jiang: Tianjin University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Ionic covalent organic framework membranes (iCOFMs) hold great promise in ion conduction-relevant applications because the high content and monodispersed ionic groups could afford superior ion conduction. The key to push the upper limit of ion conductivity is to maximize the ion exchange capacity (IEC). Here, we explore iCOFMs with a superhigh ion exchange capacity of 4.6 mmol g−1, using a dual-activation interfacial polymerization strategy. Fukui function is employed as a descriptor of monomer reactivity. We use Brønsted acid to activate aldehyde monomers in organic phase and Brønsted base to activate ionic amine monomers in water phase. After the dual-activation, the reaction between aldehyde monomer and amine monomer at the water-organic interface is significantly accelerated, leading to iCOFMs with high crystallinity. The resultant iCOFMs display a prominent proton conductivity up to 0.66 S cm−1, holding great promise in ion transport and ionic separation applications.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28643-8

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DOI: 10.1038/s41467-022-28643-8

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