A Study on Cathode Degradation of PEMFCs under On/off Cycling Operation

Title
A Study on Cathode Degradation of PEMFCs under On/off Cycling Operation
Authors
김재홍조은애장종현김형준임태훈오인환
Keywords
PEMFC; Durability
Issue Date
2010-04
Publisher
Meeting of the Electrochemical Society
Abstract
To elucidate the mechanism, EPMA, WDS, BSEM, on-line CO2 analysis, XPS, TOF-SIMS, ICP, XRD, FETEM, SAED, EDX and FTIR were carried out before and after the durability test. The results revealed that pronounced Pt coarsening (agglomeration)/ oxidation/dissolution (detachment) and migration occurred along with corrosion of the carbon support at the majority of cathode catalyst layers. These changes contributed to the significant loss of Pt mass available for electrochemical reactions and 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 cathode inlet RH. Based on these results, a modified mechanism for the degradation of the cathode catalyst layer during the startup-shutdown cycling of PEMFCs is proposed to explore the effects of RH on fuel cell performance and durability
URI
http://pubs.kist.re.kr/handle/201004/37551
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KIST Publication > Conference Paper
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