Effects of residual oxygen partial pressure on the degradation of polymer electrolyte membrane fuel cells under reverse current conditions
- Effects of residual oxygen partial pressure on the degradation of polymer electrolyte membrane fuel cells under reverse current conditions
- 엄광섭; 조유연; 조은애; 임태훈; 장종현; 김형준; 홍보기; 이종현
- fuel cell; degradation; durability; Polymer electrolyte membrane fuel cell; Reverse current condition; Oxygen partial pressure
- Issue Date
- Journal of power sources
- VOL 198, NO 1, 42-50
- 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.
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