期刊
JOURNAL OF POWER SOURCES
卷 194, 期 2, 页码 662-667出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.06.045
关键词
Multiblock copolymers; Fuel cell performance; Electrochemical atomic force microscopy; Conductive area ratio; Polymer electrolyte membrane
资金
- Ministry of Economy, Trade and Industry of Japan
- Nissan Motor Co
- US Department of Energy [DE-FG-36-06G016038]
The correlation between membrane surface morphology and fuel cell performance was investigated using a series of hydrophilic-hydrophobic multiblock copolymers based on poly(arylene ether sulfone) with different block lengths. The proton conductive regions on the membrane surface were successfully observed by using electrochemical atomic force microscopy (e-AFM). The results revealed a strong dependence of the hydrophilic/hydrophobic microphase-separated structure on the block length. The conductive area ratio (CAR) estimated from the proton conduction image decreased as the block length increased, and it was found to be closely connected with cell resistance that determines fuel cell performance. The well-defined phase-separated structure of multiblock copolymers can improve proton conductivity without any undesirable increments in water uptake or swelling, but in some instances, it affects the interfacial connection with the catalyst layer, resulting in lower fuel cell performance. The results of this study suggest the necessity for further improvement of the membrane morphology by optimizing both the casting conditions and the molecular design of the block sequences. (C) 2009 Elsevier B.V. All rights reserved.
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