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.
引用
收藏
页码:4593 / 4599
页数:7
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