Physical and Electrochemical Characteristics of Pulsed Laser Deposited La0.6Sr0.4CoO3-δ-Ce0.9Gd0.1O2-δ Nanocomposites as a Function of the Mixing Ratio

Title
Physical and Electrochemical Characteristics of Pulsed Laser Deposited La0.6Sr0.4CoO3-δ-Ce0.9Gd0.1O2-δ Nanocomposites as a Function of the Mixing Ratio
Authors
박정훈홍완식윤경중이종호이해원손지원
Keywords
Nanocomposite; SOFC Cathode; PLD; MIxing Ratio
Issue Date
2014-01
Publisher
Journal of the Electrochemical Society
Citation
VOL 161, NO 1, F16-F22
Abstract
Binary nanocomposite thin films of lanthanum strontium cobaltite and gadolinia-doped ceria (La0.6Sr0.4CoO3−δ-Ce0.9Gd0.1O2−δ, LSC-GDC) were prepared using pulsed laser deposition (PLD) for application as cathodes of low-temperature operating solid oxide fuel cell (LT-SOFC). The thin films were fabricated under identical deposition conditions, but the LSC:GDC mixing ratio was varied. The PLD-processed LSC-GDC nanocomposites exhibit different physical and electrochemical properties than do conventional powder-processed composite SOFC cathodes. The LSC:GDC mixing ratio not only alters the composition of the LSC-GDC nanocomposite thin films but also affects their crystallographic orientation and microstructure. The major component of the composite appears to govern the physical properties of the LSC-GDC nanocomposite thin films. The electrochemical properties measured with AC impedance spectroscopy during the half-cell tests reveal that the electrochemical performance of the LSC-GDC nanocomposite cathode is enhanced as the LSC content in the composite increases, which is in contrast to the behavior of powderprocessed composite cathodes. The present study provides important insight into the design and application of thin-film-processed nanocomposite electrodes.
URI
http://pubs.kist.re.kr/handle/201004/47058
ISSN
00134651
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