Effect of crosslinking on the durability and electrochemical performance of sulfonated aromatic polymer membranes at elevated temperatures
- Authors
- Shin, Dong Won; Lee, So Young; Kang, Na Rae; Lee, Kang Hyuck; Cho, Doo Hee; Lee, Moon Joo; Lee, Young Moo; Do Suh, Kyung
- Issue Date
- Mar-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Fuel cell; Proton exchange membrane; Highly sulfonated polymer; Crosslinking; Polysulfide
- Citation
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.39, no.9, pp.4459 - 4467
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
- Volume
- 39
- Number
- 9
- Start Page
- 4459
- End Page
- 4467
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/133988
- DOI
- 10.1016/j.ijhydene.2014.01.006
- ISSN
- 0360-3199
- Abstract
- End-group crosslinked sulfonated poly(arylene sulfide nitrile) (XESPSN) membranes are prepared to investigate the effect of crosslinking on the properties of sulfonated aromatic polymer membranes at elevated temperatures (>100 degrees C). The morphological transformation during annealing and crosslinking is confirmed by atomic force microscopy. The XESPSN membranes show outstanding thermal and mechanical properties compared to pristine and non-crosslinked ESPSN and Nafion (R) up to 200 degrees C. In addition, the XESPSN membranes exhibit higher proton conductivities (0.011-0.023 S cm(-1)) than the as-prepared pristine ESPSN (0.004 S cm(-1)), particularly at elevated temperature (120 degrees C) and low relative humidity (35%) conditions due to its well-ordered hydrophilic morphology after cross-linking. Therefore, the XESPSN membranes demonstrate significantly improved maximum power densities (415-485 mW cm(-2)) compared to the ESPSN (281 mW cm(-2)) and Nafion (R) (314 mW cm (2)) membranes in single cell performance tests conducted at 120 degrees C and 35% relative humidity. Furthermore, the XESPSN membrane exhibits a much longer duration than the ESPSN membrane during fuel cell operation under a constant current load as a result of its improved mechanical and thermal stabilities.
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