Electrochemical performance of nanostructured La0.6Sr0.4CoO3-δ and Sm0.5Sr0.5CoO3-δ cathodes for IT-SOFCs

被引：48
作者：
Acuna, L. M. [2 ]
Pena-Martinez, J. [3 ]
Marrero-Lopez, D. [3 ]
Fuentes, R. O. [2 ]
Nunez, P. [3 ]
Lamas, D. G. [1 ,2 ]
机构：
[1] Univ Natl Comahue, Fac Ingn, Lab Caracterizac Mat, RA-8300 Neuquen, Argentina
[2] CITEFA CONICET, CINSO Ctr Invest Solidos, RA-1603 Villa Martelli, Buenos Aires, Argentina
[3] Univ La Laguna, Dept Quim Inorgan, E-38200 San Cristobal la Laguna, Tenerife, Spain
来源：
JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 22期
关键词：
Nanocrystalline materials; Intermediate-temperature solid-oxide fuel cells; Cathode; Mixed ionic-electronic conductor; Cobaltite; OXIDE FUEL-CELLS; STRUCTURED SM0.5SR0.5COO3-DELTA; LANTHANUM COBALTITE; IONIC-CONDUCTIVITY; TEMPERATURE SOFCS; ELECTRODES; MECHANISM;
D O I：
10.1016/j.jpowsour.2011.07.067
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：
The electrochemical performance of nanostructured cathodes for IT-SOFCs based on perovskite-type mixed ionic/electronic conductors (MIECs) is investigated. Different compounds (La0.6Sr0.4CoO3-delta and Sm0.5Sr0.5CoO3-delta) and synthesis methods (freeze-drying and citrate complexation) were evaluated. These materials exhibited excellent performance (area-specific resistance values in the range of 0.05-0.20 Omega cm(2) for an operating temperature of 700 degrees C), which improved with decreasing grain size. This performance can be attributed to the high specific surface area of these nanostructured cathodes, thus dramatically increasing the number of active sites for the oxygen reduction reaction. Under these conditions, the electrochemical properties are mainly controlled by oxide ion diffusion through the MIEC cathode, which becomes faster with decreasing grain size. (C) 2011 Published by Elsevier B.V.
引用
收藏
页码：9276 / 9283
页数：8
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