Effects of residual oxygen partial pressure on the degradation of polymer electrolyte membrane fuel cells under reverse current conditions

Title
Effects of residual oxygen partial pressure on the degradation of polymer electrolyte membrane fuel cells under reverse current conditions
Authors
엄광섭조유연조은애임태훈장종현김형준홍보기이종현
Keywords
fuel cell; degradation; durability; Polymer electrolyte membrane fuel cell; Reverse current condition; Oxygen partial pressure
Issue Date
2012-01
Publisher
Journal of power sources
Citation
VOL 198, NO 1, 42-50
Abstract
A PEMFC stack inevitably experiences reverse current conditions during startup and shutdown processes. Residual oxygen partial pressure in the stack affects the local potential in the cathode facing oxygen in the anode and plays a critical role in cathode degradation. In this study, effects of residual oxygen partial pressure on PEMFC degradation were studied under reverse current conditions. Increasing the residual oxygen partial pressure under repetitive reverse current conditions accelerates performance decay and facilitates cathode degradation. Cathode degradation is revealed by an increase in chargetransfer resistance and a decrease in electrochemical active surface area, which can be attributed to corrosion of the carbon support and dissolution/migration and agglomeration of the platinum catalyst.
URI
http://pubs.kist.re.kr/handle/201004/42210
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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