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Development of efficient aqueous organic redox flow batteries using ion-sieving sulfonated polymer membranes

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Title: Development of efficient aqueous organic redox flow batteries using ion-sieving sulfonated polymer membranes
Authors: Ye, C
Wang, A
Breakwell, C
Tan, R
Bezzu, G
Hunter-Sellars, E
Williams, D
Brandon, N
Klusener, P
Kucernak, A
Jelfs, K
McKeown, N
Song, Q
Item Type: Journal Article
Abstract: Redox flow batteries using aqueous organic-based electrolytes are promising candidates for developing cost-effective grid-scale energy storage devices. However, a significant drawback of these batteries is the cross-mixing of active species through the membrane, which causes battery performance degradation. To overcome this issue, here we report size-selective ion-exchange membranes prepared by sulfonation of a spirobifluorene-based microporous polymer and demonstrate their efficient ion sieving functions in flow batteries. The spirobifluorene unit allows control over the degree of sulfonation to optimize the transport of cations, whilst the microporous structure inhibits the crossover of organic molecules via molecular sieving. Furthermore, the enhanced membrane selectivity mitigates the crossover-induced capacity decay whilst maintaining good ionic conductivity for aqueous electrolyte solution at pH 9, where the redox-active organic molecules show long-term stability. We also prove the boosting effect of the membranes on the energy efficiency and peak power density of the aqueous redox flow battery, which shows stable operation for about 120 h (i.e., 2100 charge-discharge cycles at 100 mA cm−2) in a laboratory-scale cell.
Issue Date: 8-Jun-2022
Date of Acceptance: 23-May-2022
URI: http://hdl.handle.net/10044/1/97663
DOI: 10.1038/s41467-022-30943-y
ISSN: 2041-1723
Publisher: Nature Research
Journal / Book Title: Nature Communications
Volume: 13
Copyright Statement: © The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Funder's Grant Number: 851272
Bth Ref: RC-CE1204
Publication Status: Published
Article Number: ARTN 3184
Appears in Collections:Chemistry
Chemical Engineering
Faculty of Natural Sciences

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