Synthesis and evaluation of nano-size lanthanum strontium manganite-yttria-stablized zirconia composite powders as cathodes for solid oxide fuel cells
SCIE
SCOPUS
- Title
- Synthesis and evaluation of nano-size lanthanum strontium manganite-yttria-stablized zirconia composite powders as cathodes for solid oxide fuel cells
- Authors
- Park, J; Zou, J; Chung, J
- Date Issued
- 2010-08-01
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- Nano-sized (50 nm) lanthanum strontium manganite (La0.8Sr0.2MnO3, LSM) particles are deposited on yttria-stablized zirconia (8YSZ) by synthesizing LSM particles in situ in an YSZ-dispersed solution. As the LSM content is decreased from 80 to 25 wt.%, 50 wt.% powder shows the best microstructure and phase connectivity. This composite, when used as a cathode in a button cell, also has the highest power density of 791 mW cm(-2) at 800 degrees C and the lowest values of the cathode polarization resistance and high-frequency arc (0.315 and 0.120 Omega cm(2), respectively). Initially, the low-frequency arc shows a rapid decrease as the LSM content is reduced from 80 to 60 wt.%. After this, an abrupt drop at 50 wt.% LSM content is followed by a slow decrease in the low-frequency arc with further decrease in the LSM content. The results suggest that the high-frequency arc is related to charge transfer and the low-frequency arc to the site density of the triple-phase boundary (TPB). A new parameter, the charge-transfer efficiency of the TPB site, is defined and used to explain further the observed effect of LSM content on YSZ. (C) 2010 Elsevier B.V. All rights reserved.
- Keywords
- Solid oxide fuel cell (SOFC); Lanthanum strontium manganite; Yttria-stablized zirconia; Composite cathode; LSM; PERFORMANCE; NANOPARTICLES; ELECTRODES; PARAMETERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25376
- DOI
- 10.1016/J.JPOWSOUR.2010.02.069
- ISSN
- 0378-7753
- Article Type
- Article
- Citation
- JOURNAL OF POWER SOURCES, vol. 195, no. 15, page. 4593 - 4599, 2010-08-01
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