Assembling covalent organic framework membranes with superior ion exchange capacity

AbstractIonic 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.

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Published: Feb 23, 2022
Vol/Issue: 13(1)
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Authors

Engineering Research Center for Optoelectronics of Guangdong Province School of Physics and Optoelectronics South China University of Technology Guangzhou Guangdong 510640 China

Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China

Ingenierie des Materiaux polymeres

School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

Cite This Article

Xiaoyao Wang, Benbing Shi, Hao Yang, et al. (2022). Assembling covalent organic framework membranes with superior ion exchange capacity. Nature Communications, 13(1). https://doi.org/10.1038/s41467-022-28643-8

Assembling covalent organic framework membranes with superior ion exchange capacity

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