Effects of Cathode Inlet Relative Humidity on PEMFC Durability during Startup-Shutdown Cycling: II. Diagnostic Study

Title
Effects of Cathode Inlet Relative Humidity on PEMFC Durability during Startup-Shutdown Cycling: II. Diagnostic Study
Authors
김재홍조유연조은애장종현김형준임태훈오인환고재준Son Ik Jae
Keywords
PEMFC; Durability; MEA; RH
Issue Date
2010-05
Publisher
Journal of the Electrochemical Society
Citation
VOL 157, NO 5, B633-B642
Abstract
This paper uses a variety of physicochemical methods to elucidate the mechanism by which cathode inlet relative humidity (RH) degrades a proton exchange membrane fuel cell (PEMFC) during startup–shutdown cycling. The results revealed that the pronounced Pt coarsening (agglomeration)/oxidation/dissolution (detachment)) and migration were observed along with corrosion of the carbon support at the majority of cathode catalyst layers when PEMFCs were exposed to a higher cathode inlet RH during 1500 startup–shutdown cycles. These changes contributed to the significant loss of Pt mass available for electrochemical reactions and an active Pt surface area at the cathode, thus decaying the performance of the fuel cell. In addition, the rate of these multiple processes was RH-dependent. However, the degradation at the anode and membrane was not as severe as those observed at the cathode and did not show any dependence on the cathode inlet RH. Based on these results, a modified mechanism for the degradation of the cathode catalyst layer during startup–shutdown cycling of PEMFCs is proposed to explain the effects of RH on fuel cell performance and durability.
URI
http://pubs.kist.re.kr/handle/201004/38115
ISSN
0013-4651
Appears in Collections:
KIST Publication > Article
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