High selectivity framework polymer membranes chemically tuned towards fast anion conduction
Abstract Studying ion transport in the interaction confinement regime has important implications for membrane design and advanced electrochemical devices. A key example is the rapid-charging capability of aqueous organic redox flow batteries, enabled by near-frictionless Na+/K+ transport within tria...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-04-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-58638-0 |
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| author | Junkai Fang Guozhen Zhang Marc-Antoni Goulet Peipei Zuo Yu Zhou Hui Li Jun Jiang Michael D. Guiver Zhengjin Yang Tongwen Xu |
| author_facet | Junkai Fang Guozhen Zhang Marc-Antoni Goulet Peipei Zuo Yu Zhou Hui Li Jun Jiang Michael D. Guiver Zhengjin Yang Tongwen Xu |
| author_sort | Junkai Fang |
| collection | DOAJ |
| description | Abstract Studying ion transport in the interaction confinement regime has important implications for membrane design and advanced electrochemical devices. A key example is the rapid-charging capability of aqueous organic redox flow batteries, enabled by near-frictionless Na+/K+ transport within triazine framework membranes. However, achieving similar breakthroughs for devices using anions (e.g., Cl-) is challenging due to the suppression of anion transport under confinement, known as the charge asymmetry effect. We present a series of anion-selective covalent triazine framework membranes with comparable densities of subnanometer ion transport channels and identical micropore size distributions, which help to overcome the charge asymmetry effect and promote fast anion conduction. We demonstrate that regulating the charge distribution in the membrane frameworks reduces the energy barrier for anion transport, resulting in nearly doubled Cl- conductivity and adding almost no additional energy barrier for F- transport. This membrane enables an aqueous organic redox flow battery using Cl- ions to operate at high current densities, exceeding battery performance demonstrated by current membranes. These findings could benefit various electrochemical devices and inspire single-species selectivity in separation membranes. |
| format | Article |
| id | doaj-art-0f899508622c4e648ef30eb02260e2a9 |
| institution | DOAJ |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-0f899508622c4e648ef30eb02260e2a92025-08-20T03:04:51ZengNature PortfolioNature Communications2041-17232025-04-0116111210.1038/s41467-025-58638-0High selectivity framework polymer membranes chemically tuned towards fast anion conductionJunkai Fang0Guozhen Zhang1Marc-Antoni Goulet2Peipei Zuo3Yu Zhou4Hui Li5Jun Jiang6Michael D. Guiver7Zhengjin Yang8Tongwen Xu9Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of ChinaHefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of ChinaDepartment of Chemical and Materials Engineering, Concordia UniversityKey Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of ChinaHefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of ChinaKey Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of ChinaKey Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of ChinaState Key Laboratory of Engines, School of Mechanical Engineering, Tianjin UniversityKey Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of ChinaKey Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of ChinaAbstract Studying ion transport in the interaction confinement regime has important implications for membrane design and advanced electrochemical devices. A key example is the rapid-charging capability of aqueous organic redox flow batteries, enabled by near-frictionless Na+/K+ transport within triazine framework membranes. However, achieving similar breakthroughs for devices using anions (e.g., Cl-) is challenging due to the suppression of anion transport under confinement, known as the charge asymmetry effect. We present a series of anion-selective covalent triazine framework membranes with comparable densities of subnanometer ion transport channels and identical micropore size distributions, which help to overcome the charge asymmetry effect and promote fast anion conduction. We demonstrate that regulating the charge distribution in the membrane frameworks reduces the energy barrier for anion transport, resulting in nearly doubled Cl- conductivity and adding almost no additional energy barrier for F- transport. This membrane enables an aqueous organic redox flow battery using Cl- ions to operate at high current densities, exceeding battery performance demonstrated by current membranes. These findings could benefit various electrochemical devices and inspire single-species selectivity in separation membranes.https://doi.org/10.1038/s41467-025-58638-0 |
| spellingShingle | Junkai Fang Guozhen Zhang Marc-Antoni Goulet Peipei Zuo Yu Zhou Hui Li Jun Jiang Michael D. Guiver Zhengjin Yang Tongwen Xu High selectivity framework polymer membranes chemically tuned towards fast anion conduction Nature Communications |
| title | High selectivity framework polymer membranes chemically tuned towards fast anion conduction |
| title_full | High selectivity framework polymer membranes chemically tuned towards fast anion conduction |
| title_fullStr | High selectivity framework polymer membranes chemically tuned towards fast anion conduction |
| title_full_unstemmed | High selectivity framework polymer membranes chemically tuned towards fast anion conduction |
| title_short | High selectivity framework polymer membranes chemically tuned towards fast anion conduction |
| title_sort | high selectivity framework polymer membranes chemically tuned towards fast anion conduction |
| url | https://doi.org/10.1038/s41467-025-58638-0 |
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