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Crystallizing Self-Standing Covalent Organic Framework Membranes for Ultrafast Proton Transport in Flow Batteries |
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| Authors: | Yulin Wu Dr Yixing Wang Dr Dezhu Zhang Fang Xu Liheng Dai Kai Qu Hongyan Cao Yu Xia Siyao Li Prof Kang Huang Prof Zhi Xu |
| Institution: | 1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Shanghai, 200237 China
These authors contributed equally to this work.;2. Suzhou Laboratory, Suzhou, 215000 China These authors contributed equally to this work.;3. Suzhou Laboratory, Suzhou, 215000 China;4. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing, 211816 China;5. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, No.130 Meilong Road, Shanghai, 200237 China;6. Suzhou Laboratory, Suzhou, 215000 China State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No. 30 Puzhu South Road, Nanjing, 211816 China |
| Abstract: | Covalent organic frameworks (COFs) display great potential to be assembled into proton conductive membranes for their uniform and controllable pore structure, yet constructing self-standing COF membrane with high crystallinity to fully exploit their ordered crystalline channels for efficient ionic conduction remains a great challenge. Here, a macromolecular-mediated crystallization strategy is designed to manipulate the crystallization of self-standing COF membrane, where the −SO3H groups in introduced sulfonated macromolecule chains function as the sites to interact with the precursors of COF and thus offer long-range ordered template for membrane crystallization. The optimized self-standing COF membrane composed of highly-ordered nanopores exhibits high proton conductivity (75 mS cm−1 at 100 % relative humidity and 20 °C) and excellent flow battery performance, outperforming Nafion 212 and reported membranes. Meanwhile, the long-term run of membrane is achieved with the help of the anchoring effect of flexible macromolecule chains. Our work provides inspiration to design self-standing COF membranes with ordered channels for permselective application. |
| Keywords: | Covalent Organic Frameworks Crystallization Flow Battery Proton Transport Self-Standing Membranes |