PPOs having piperidinium-based conducting head groups with extra molecular interaction sites as new anion exchange membranes
- Mayadevi, T. S.; Min, Kyungwhan; Choi, Ook; Chae, Ji Eon; Kim, Hyoung-Juhn; Choi, Chan Hee; Kang, Hoseong; Park, Chi Hoon; Kim, Tae-Hyun
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- Anion exchange membranes; Conducting head groups; Hydrogen bonding; Enhanced alkaline stability; Conducting highway
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.47, no.36, pp.16222 - 16234
- Journal Title
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
- Start Page
- End Page
- Poly(2,6-dimethyl-1,4-phenylene oxide)s [PPOs] with 4-hydroxy-piperidinium and tropi-nium conducting head groups are developed, and corresponding membranes are investi-gated as new anion exchange membranes (AEMs). Their properties are compared with piperidinium-functionalized PPO membranes. The additional OH group in the piper-idinium unit further enhances the chemo-physical stability of the corresponding mem-brane (OH-Pip-PPO) due to physical crosslinking through hydrogen bonding. The bulky structure of tropinium provides additional free volume in the corresponding membrane (Trop-PPO). Hydrogen bonding between the polymers and water causes well-developed morphology and high dimensional stability. These membranes also contain ion conducting highways, facilitating efficient ion transport, in agreement with molecular dynamics simulations. The 4-hydroxy-piperidinium-functionalized PPO showed the highest dimensional and alkaline stability, with slightly lower conductivity and cell performance than piperidinium-functionalized-PPO (Pip-PPO) and Trop-PPO. Trop-PPO further increases free volume and water uptake, resulting in the highest normalized conductivity among the three PPO-based membranes and fuel cell performance similar to Pip-PPO.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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- 융합기술공과대학 > Department of Energy Engineering > Journal Articles
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