Effect of crosslinking on the durability and electrochemical performance of sulfonated aromatic polymer membranes at elevated temperatures
- Title
- Effect of crosslinking on the durability and electrochemical performance of sulfonated aromatic polymer membranes at elevated temperatures
- Author
- 서경도
- Keywords
- Fuel cell; Proton exchange membrane; Highly sulfonated polymer; Crosslinking; Polysulfide
- Issue Date
- 2014-03
- Publisher
- Elsevier Science B.V., Amsterdam.
- Citation
- International journal of hydrogen energy, Vol.39 No.9 [2014], pp. 4459-4467
- 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. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
- URI
- http://www.sciencedirect.com/science/article/pii/S036031991400055X?via%3Dihubhttp://hdl.handle.net/20.500.11754/49564
- ISSN
- 0360-3199
- DOI
- 10.1016/j.ijhydene.2014.01.006
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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