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
- 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
- 전순열; 이지선; Gema M. Rios; 김형준; 이상엽; 조은애; 임태훈; 장종현
- Decal transfer method; Nafion ionomer; Relative humidity; Ionic resistance; Polymer electrolyte membrane fuel cells (PEMFCs); Membrane-electrodeassembly(MEA)
- Issue Date
- International journal of hydrogen energy
- VOL 35, NO 18, 9678-9686
- 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.
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