Effects of storage conditions on performance degradation of PEMFCs after shutdown

Title
Effects of storage conditions on performance degradation of PEMFCs after shutdown
Authors
조은애조유연김재홍김정현임태훈오인환장종현김형준
Keywords
PEMFC; Durability; Storage conditions; On/off cycling
Issue Date
2009-10
Publisher
216th ECS Meeting
Abstract
Different storage conditions prior to startup process were examined to explore possible methods of mitigating the cell performance decay and durability loss under the repetitive on/off cycling operation. The cell performance and durability were substantially influenced by the storage conditions, which included exposure of the membrane electrode assembly (MEA) to either air/air or H2/N2 environment prior to starting up a cell. By using dummy load which enable remove residual reactant gases in the flow channel, the cell stored in H2/N2 showed better performance and durability after 1200 cycles. However, in the case of a cell stored in air/air condition, significant performance decay was observed after 1200 cycles due to degradation of cathode catalyst layer by reverse current. Various electrochemical analyses, including measurement of polarization curves, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), linear sweep voltammetry (LSV), and physicochemical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electron probe micro analyzer (EPMA) were employed to achieve better understanding of the degradation phenomena.
URI
http://pubs.kist.re.kr/handle/201004/36099
Appears in Collections:
KIST Publication > Conference Paper
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