Effect of ionomer content and relative humidity on polymer electrolyte membrane fuel cell (PEMFC) performance of membrane-electrode assemblies (MEAs) prepared by decal transfer method

Title
Effect of ionomer content and relative humidity on polymer electrolyte membrane fuel cell (PEMFC) performance of membrane-electrode assemblies (MEAs) prepared by decal transfer method
Authors
전순열이지선Gema M. Rios김형준이상엽조은애임태훈장종현
Keywords
Decal transfer method; Nafion ionomer; Relative humidity; Ionic resistance; Polymer electrolyte membrane fuel cells (PEMFCs); Membrane-electrodeassembly(MEA)
Issue Date
2010-09
Publisher
International journal of hydrogen energy
Citation
VOL 35, NO 18, 9678-9686
Abstract
Membrane-electrode assemblies (MEAs) were fabricated by the decal transfer method with various Nafion ionomer contents (10-40 wt%) and their single cell performance and electrochemical characteristics were examined in atmospheric air at relative humidities of 25-95%. At high humidity (95%), the MEA performance was the highest with a cathode ionomer content of 30 and 20 wt% at 0.6 and 0.4 V, respectively. The optimum ionomer content of the decal MEAs increased with decreasing humidity, because of the change in the oxygen transport rate (water flooding) and number of active sites (ionic resistance). The concentration overpotential gradually increased with relative humidity up to about 0.4 V at 0.8 A/㎠, which was not considered in previous studies using pressurized air and oxygen. The combined effect of the electrochemical active surface area and ionic resistance of the cathodes on the activation overpotential was also investigated, focusing on intermediate and low humidity levels, using a newly developed impedance analysis method.
URI
http://pubs.kist.re.kr/handle/201004/37896
ISSN
0360-3199
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KIST Publication > Article
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