La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes infiltrated with samarium-doped cerium oxide for solid oxide fuel cells

被引：182

作者：

Nie, Lifang ^{[1
,2
]}

Liu, Mingfei ^{[1
]}

Zhang, Yujun ^{[2
]}

Liu, Meilin ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[2] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 15期

关键词：

LSCF; Cathode; SDC; Infiltration method; SOFC; COMPOSITE CATHODE; STABILITY; SOFC;

D O I：

10.1016/j.jpowsour.2010.02.049

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：

Porous La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathodes are coated with a thin film of Sm0.2Ce0.8O1.95-delta (SDC) using a one-step infiltration process. Examination of the microstructures reveals that small SDC particles are formed on the surface of LSCF grains with a relatively narrow size distribution. Impedance analysis indicates that the SDC infiltration has dramatically reduced the polarization of LSCF cathode, reaching interfacial resistances of 0.074 and 0.44 Omega cm(2) at 750 degrees C and 650 degrees C, respectively, which are about half of those for LSCF cathode without infiltration of SDC. The activation energies of the SDC infiltrated LSCF cathodes are in the range of 1.42-1.55 eV, slightly lower than those for a blank LSCF cathode. The SDC infiltrated LSCF cathodes have also shown improved stability under typical SOFC operating conditions, suggesting that SDC infiltration improves not only power output but also performance stability and operational life. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：4704 / 4708

页数：5

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