Degradation of polymer electrolyte membrane fuel cells repetitively exposed to reverse current condition under different temperature

Title
Degradation of polymer electrolyte membrane fuel cells repetitively exposed to reverse current condition under different temperature
Authors
조유연조은애김정현임태훈오인환김수길김형준장종현
Keywords
Polymer electrolyte membrane fuel cells; Operating temperature; Startup/shutdown cycle; Carbon corrosion; Durability
Issue Date
2011-12
Publisher
Journal of power sources
Citation
VOL 196, NO 23, 9906-9915
Abstract
Effects of operating temperature on performance degradation of polymer electrolyte membrane fuel cells (PEMFCs) were investigated under the repetitive startup/shutdown cycling operation that induced the so-called ‘reverse current condition’. With repeating the startup/shutdown cycle, polarization curves, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), linear sweep voltammetry (LSV) were measured to examine in situ electrochemical degradation of the MEAs. To investigate physicochemical degradation of the MEAs, scanning electron microscopy (SEM), electron probe micro analysis (EPMA), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) were employed before and after the startup/shutdown cycling operation. With increasing operating temperature from 40 to 65 and 80 ◦C under the repetitive reverse-current condition, the cell performance decayed faster since corrosion of the carbon support and dissolution/migration/agglomeration of Pt catalyst were accelerated resulting in increases in ohmic and charge transfer resistance and loss of EAS.
URI
http://pubs.kist.re.kr/handle/201004/40155
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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