Highly ion-selective sulfonated poly (4,4′-diphenylether-5,5′-bibenzimidazole) membranes for vanadium redox flow battery
Renewable energy requires long-duration energy storage technologies, of which vanadium flow battery is regarded as the most suitable candidate for safe and long-duration energy storage applications. However, vanadium flow batteries still suffer from capacity decay and low power density, which aris...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2024-12-01
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| Series: | Journal of Experimental Nanoscience |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/17458080.2024.2327288 |
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| Summary: | Renewable energy requires long-duration energy storage technologies, of which vanadium flow battery is regarded as the most suitable candidate for safe and long-duration energy storage applications. However, vanadium flow batteries still suffer from capacity decay and low power density, which arise from membrane degradation and high resistance. Herein, a sulfonated poly (4,4′-diphenylether-5,5′-bibenzimidazole) (SOPBI) membrane is reported for use in vanadium redox flow batteries. The prepared SOPBI membranes show an area resistance of 0.63 Ω cm2 at room temperature after doped with 3 M H2SO4. Moreover, membranes with 3 M H2SO4 doping exhibit tensile stress at break of 15.1 MPa. Benefiting from the SOPBI membrane, the all-vanadium redox flow battery delivers a superior energy efficiency of 77.7% at 140 mA cm−2 while operating stably at a current density of 120 mA cm−2 for 200 cycles. |
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| ISSN: | 1745-8080 1745-8099 |