Performance Degradation of Lanthanum Strontium Cobaltite after Surface Modification

In the present study, the surface of La0.6Sr0.4CoO3 (LSC) was modified via atomic layer deposition (ALD) using CoOx as the modification material. The effect of the ALD CoOx treatment on the LSC-based anode-supported solid oxide fuel cell was analyzed and the ALD CoOx-treated cell was found to exhibi...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2015-01, Vol.162 (6), p.F622-F626
Main Authors: Choi, Hyung Jong, Bae, Kiho, Jang, Dong Young, Kim, Jun Woo, Shim, Joon Hyung
Format: Article
Language:English
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Summary:In the present study, the surface of La0.6Sr0.4CoO3 (LSC) was modified via atomic layer deposition (ALD) using CoOx as the modification material. The effect of the ALD CoOx treatment on the LSC-based anode-supported solid oxide fuel cell was analyzed and the ALD CoOx-treated cell was found to exhibit lower power density than that of the bare cell. Based on the electrochemical impedance spectroscopy measurements, it was concluded that this degradation stems mainly from the increased polarization loss, which results from the deterioration of the oxygen surface exchange property. Similarly, examining the bode plot revealed that the impedance at frequencies lower than 1 kHz increased mainly after the CoOx treatment; this increased impedance is believed to be associated with the limitation of O2 adsorption and dissociation.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.0971506jes