Effects of storage conditions on performance degradation of PEMFCs after shutdown
- Effects of storage conditions on performance degradation of PEMFCs after shutdown
- 조은애; 조유연; 김재홍; 김정현; 임태훈; 오인환; 장종현; 김형준
- PEMFC; Durability; Storage conditions; On/off cycling
- Issue Date
- 216th ECS Meeting
- 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.
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