Influence of crosslinking in phosphoric acid-doped poly(phenylene oxide) membranes on their proton exchange membrane properties
- Authors
- Min, Cheong-Min; Jang, Joseph; Kang, Beom-Goo; Lee, Jae-Suk
- Issue Date
- 25-Mar-2022
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Phosphoric acid; Quaternary ammonium; Ion-pair interaction; Crosslinking; High-temperature proton exchange membranes
- Citation
- JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v.107, pp.436 - 443
- Journal Title
- JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
- Volume
- 107
- Start Page
- 436
- End Page
- 443
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/42000
- DOI
- 10.1016/j.jiec.2021.12.014
- ISSN
- 1226-086X
- Abstract
- Phosphoric acid (PA)-doped membranes are promising electrolytes for high-temperature proton exchange membrane fuel cells (HT-PEMFCs). However, long-term durability issues have been an obstacle to their commercialization. Herein, we report a series of poly(phenylene oxide) (PPO)-based crosslinked membranes containing quaternary ammonium (QA) groups and exhibiting enhanced physicochemical stability and PA retention via ion-pair interactions between QA and PA. The degree of crosslinking in PPO by diamine crosslinker was controlled at 20, 30, and 40. The membranes were also crosslinked (degree = 20) using diamine crosslinkers with variable alkyl chain length (ethyl, butyl, and hexyl). All membranes exhibited sufficient thermal stability (5% weight loss temperatures (TD5%) = -230 degrees C) and oxidative stability (-85% in the Fenton test). The PA uptake of the resulting membranes was controlled between 110 and 154% depending on their crosslinked structures. The membrane with the lowest degree of crosslinking (20) and shortest crosslinker exhibited the highest PA uptake and highest anhydrous proton conductivity (0.043 S/cm at 150 degrees C) in doped state. The proton conductivity was found to be significantly influenced by the PA uptake and crosslinked membrane structures. The highest PA retention of 89% was exhibited by the PA-doped membrane with the highest degree of crosslinking (40). (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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