Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries
Anion exchange blend membranes (AEBMs) were prepared for use in Vanadium Redox Flow Batteries (VRFBs). These AEBMs consisted of 3 polymer components. Firstly, PBI-OO (nonfluorinated PBI) or F6-PBI (partially fluorinated PBI) were used as a matrix polymer. The second polymer, a bromomethylated PPO, w...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-02-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/9/2/31 |
| _version_ | 1797765130981736448 |
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| author | Hyeongrae Cho Henning M. Krieg Jochen A. Kerres |
| author_facet | Hyeongrae Cho Henning M. Krieg Jochen A. Kerres |
| author_sort | Hyeongrae Cho |
| collection | DOAJ |
| description | Anion exchange blend membranes (AEBMs) were prepared for use in Vanadium Redox Flow Batteries (VRFBs). These AEBMs consisted of 3 polymer components. Firstly, PBI-OO (nonfluorinated PBI) or F6-PBI (partially fluorinated PBI) were used as a matrix polymer. The second polymer, a bromomethylated PPO, was quaternized with 1,2,4,5-tetramethylimidazole (TMIm) which provided the anion exchange sites. Thirdly, a partially fluorinated polyether or a non-fluorinated poly (ether sulfone) was used as an ionical cross-linker. While the AEBMs were prepared with different combinations of the blend polymers, the same weight ratios of the three components were used. The AEBMs showed similar membrane properties such as ion exchange capacity, dimensional stability and thermal stability. For the VRFB application, comparable or better energy efficiencies were obtained when using the AEBMs compared to the commercial membranes included in this study, that is, Nafion (cation exchange membrane) and FAP 450 (anion exchange membrane). One of the blend membranes showed no capacity decay during a charge-discharge cycles test for 550 cycles run at 40 mA/cm<sup>2</sup> indicating superior performance compared to the commercial membranes tested. |
| first_indexed | 2024-03-12T20:05:42Z |
| format | Article |
| id | doaj.art-5ee4fe5a5fe64ba99b3c3a16f3242f46 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T20:05:42Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-5ee4fe5a5fe64ba99b3c3a16f3242f462023-08-02T02:06:27ZengMDPI AGMembranes2077-03752019-02-01923110.3390/membranes9020031membranes9020031Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow BatteriesHyeongrae Cho0Henning M. Krieg1Jochen A. Kerres2Institute of Chemical Process Engineering, University of Stuttgart, 70199 Stuttgart, GermanyFaculty of Natural Science, North-West University, Focus Area: Chemical Resource Beneficiation, Potchefstroom 2520, South AfricaInstitute of Chemical Process Engineering, University of Stuttgart, 70199 Stuttgart, GermanyAnion exchange blend membranes (AEBMs) were prepared for use in Vanadium Redox Flow Batteries (VRFBs). These AEBMs consisted of 3 polymer components. Firstly, PBI-OO (nonfluorinated PBI) or F6-PBI (partially fluorinated PBI) were used as a matrix polymer. The second polymer, a bromomethylated PPO, was quaternized with 1,2,4,5-tetramethylimidazole (TMIm) which provided the anion exchange sites. Thirdly, a partially fluorinated polyether or a non-fluorinated poly (ether sulfone) was used as an ionical cross-linker. While the AEBMs were prepared with different combinations of the blend polymers, the same weight ratios of the three components were used. The AEBMs showed similar membrane properties such as ion exchange capacity, dimensional stability and thermal stability. For the VRFB application, comparable or better energy efficiencies were obtained when using the AEBMs compared to the commercial membranes included in this study, that is, Nafion (cation exchange membrane) and FAP 450 (anion exchange membrane). One of the blend membranes showed no capacity decay during a charge-discharge cycles test for 550 cycles run at 40 mA/cm<sup>2</sup> indicating superior performance compared to the commercial membranes tested.https://www.mdpi.com/2077-0375/9/2/31vanadium redox flow batteryanion-exchange blend membraneF6-PBIbromomethylated PPO1,2,4,5-tetramethylimidazole |
| spellingShingle | Hyeongrae Cho Henning M. Krieg Jochen A. Kerres Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries Membranes vanadium redox flow battery anion-exchange blend membrane F6-PBI bromomethylated PPO 1,2,4,5-tetramethylimidazole |
| title | Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries |
| title_full | Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries |
| title_fullStr | Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries |
| title_full_unstemmed | Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries |
| title_short | Performances of Anion-Exchange Blend Membranes on Vanadium Redox Flow Batteries |
| title_sort | performances of anion exchange blend membranes on vanadium redox flow batteries |
| topic | vanadium redox flow battery anion-exchange blend membrane F6-PBI bromomethylated PPO 1,2,4,5-tetramethylimidazole |
| url | https://www.mdpi.com/2077-0375/9/2/31 |
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