The effects of Nafion ionomer content in PEMFC MEAs prepared by a catalyst-coated membrane (CCM) spraying method

Title
The effects of Nafion ionomer content in PEMFC MEAs prepared by a catalyst-coated membrane (CCM) spraying method
Authors
김근호이관영김형준조은애이상엽임태훈윤성필황인철장종현
Keywords
catalyst-coated membrane (CCM); spraying method; Nafion ionomer; polymer electrolyte membrane fuel cells (PEMFC); membrane-electrode assembly (MEA); ionic resistance
Issue Date
2010-03
Publisher
International journal of hydrogen energy
Citation
VOL 35, NO 5, 2119-2126
Abstract
We analyzed the effects of ionomer content on the proton exchange membrane fuel cell (PEMFC) performance of membrane electrode assemblies (MEAs) fabricated by a catalyst-coated membrane (CCM) spraying method in partially humidified atmospheric air and hydrogen. When high loading Pt/C catalysts (45.5 wt.%) were used, we observed that catalytic activity was not directly proportional to electrochemical active surface area (EAS). This suggests that ionic conductivity through ionomers in catalyst layers is also an important factor affecting MEA performance. In addition, the effects of mass transport were experimentally evaluated by manipulating the air stoichiometry ratio at the cathodes. MEA performance was more sensitive to flow rates under conditions of higher ionomer content. Due to the combined effect of EAS, ionic conductivity, and mass transfer characteristics (all of which varied according to the ionomer content), an MEA with 30 wt.% ionomer content at the cathode (25 wt.% at the anode) was shown to yield the best performance.
URI
http://pubs.kist.re.kr/handle/201004/40942
ISSN
0360-3199
Appears in Collections:
KIST Publication > Article
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