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Synthesis and evaluation of nano-size lanthanum strontium manganite-yttria-stablized zirconia composite powders as cathodes for solid oxide fuel cells
被引:13
作者:
Park, Jungdeok
Zou, Jing
Chung, Jongshik
[1
,2
]
机构:
[1] Pohang Univ Sci & Technol, POSTECH, Dept Chem Engn, Pohang 790784, South Korea
[2] Pohang Univ Sci & Technol, Sch Environm Sci & Engn, Pohang 790784, South Korea
关键词:
Solid oxide fuel cell (SOFC);
Lanthanum strontium manganite;
Yttria-stablized zirconia;
Composite cathode;
LSM;
NANOPARTICLES;
PERFORMANCE;
PARAMETERS;
D O I:
10.1016/j.jpowsour.2010.02.069
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
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.
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页码:4593 / 4599
页数:7
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