Microstructure Refinement of Pulsed Laser Deposited La0.6Sr0.4CoO3-δ Thin-film Cathodes for Solid Oxide Fuel Cell

Title
Microstructure Refinement of Pulsed Laser Deposited La0.6Sr0.4CoO3-δ Thin-film Cathodes for Solid Oxide Fuel Cell
Authors
황재연이헌윤경중이해원이종호송휴섭손지원
Keywords
solid oxide fuel cell; pulsed laser deposition; cathode; surface modification
Issue Date
2013-11
Publisher
Metals and Materials International
Citation
VOL 19, NO 6, 1347-1349
Abstract
In this study, the microstructural modification of pulsed laser deposited La0.6Sr0.4CoO3-δ (LSC64) thin-film cathodes for solid oxide fuel cells (SOFCs) to improve the lateral conduction and to reduce the surface composition degradation is investigated. A high-temperature deposited 100 nm-thick denser LSC64 layer is added over 2.4 μm-thick porous cathode to cover and bridge the cathode domains. According to the cell performance analyses using current-voltage-power measurements, the performance of the cell modified with an additional denser layer is increased compared with the cell without the denser layer in all operating temperature range. The degree of improvement of peak power density is bigger than 10% at 650- 550 °C and is about 6% at 500 °C. This performance enhancement can be attributed to the electrochemical property improvement, especially oxygen surface exchange property, rather than to the conduction improvement, based on the electrochemical impedance analysis. Improved crystallinity and composition integrity of the denser LSC64 layer is considered to enhance the surface exchange property of the cathode.
URI
http://pubs.kist.re.kr/handle/201004/46312
ISSN
15989623
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KIST Publication > Article
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