Crosslinked anion exchange membranes with regional intensive ion clusters prepared from quaternized branched polyethyleneimine/quaternized polysulfone |
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Affiliation: | 1. Polymer Research Institute, Sichuan University, Chengdu, 610065, China;2. College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China |
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Abstract: | A series of anion exchange membranes (AEMs) with regionally dense ion clusters are prepared by crosslinking quaternized polysulfone (QPSU) with quaternized branched polyethyleneimine (QBPEI). For the as-prepared QPSU/QBPEI AEMs, the hydrophilic QBPEI forms locally aggregated ion clusters in the QPSU matrix, which can promote the formation of an obvious microphase separation structure in the membrane. The QPSU/QBPEI-3 AEM with an ion exchange capacity of 1.88 meq/g exhibits the best performance, achieving a reasonably high ionic conductivity of 66.14 mS/cm at 80 °C and showing good oxidation stability and alkali resistance. Finally, the maximum power density of a single H2/O2 fuel cell with QPSU/QBPEI-3 AEM reaches 75.34 mW/cm2 at 80 °C. The above results indicate that QBPEI with a dendritic structure and abundant anionic conductive groups has a good application prospect in the preparation of AEMs with locally aggregated ion clusters and microphase separation structures. |
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Keywords: | Anion exchange membrane (AEM) Quaternized polysulfone (QPSU) Quaternized branched polyethyleneimine (QBPEI) Ion clusters |
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