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Research Papers

Various Lanthanum Ferrite-Based Cathode Materials With Ni and Cu Substitution for Anode-Supported Solid Oxide Fuel Cells

[+] Author and Article Information
V. A. C. Haanappel1

Institute of Energy Research, Forschungszentrum Jülich, Jülich D-52425, Germanyv.haanappel@fz-juelich.de

B. Bär, C. Tropartz, J. Mertens, F. Tietz

Institute of Energy Research, Forschungszentrum Jülich, Jülich D-52425, Germany

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(6), 061017 (Aug 26, 2010) (4 pages) doi:10.1115/1.4001355 History: Received January 05, 2010; Revised February 01, 2010; Published August 26, 2010; Online August 26, 2010

The electrochemical performance of solid oxide fuel cells with cathodes made of La0.58Sr0.4Fe0.8Ni0.2O3δ, La0.58Sr0.4Fe0.8Cu0.2O3δ, La0.58Sr0.4Fe0.6Cu0.2Co0.2O3δ, La0.58Sr0.4Fe0.7Cu0.1Co0.2O3δ, and La2Ni0.6Cu0.4O4 has been investigated. As reference, electrochemical data from cells with La0.58Sr0.4Co0.2Fe0.8O3δ cathodes were taken into account. The cathode layers were sintered at various temperatures. After testing, cross-sectional analyses were made in order to investigate microstructural changes in the various layers. Electrochemical tests have shown that only cells with a non-sintered Cu-containing cathode or with a similar cathode treated with relatively low sintering temperatures can be considered for SOFC applications. However, it was clear that the tested cells with cathodes including Cu and/or Ni showed electrochemical performance which was always lower than that of reference cells with La0.58Sr0.4Co0.2Fe0.8O3δ cathode. No electrochemical measurements were possible with cathodes sintered at or above 1000°C. Cross-sectional analyses revealed that in all these cases the presence of Cu exhibited severe chemical interaction with the electrolyte. In addition, several undesired phases were formed in the cathode as well as in the diffusion barrier layer. The extent of these phases and the interaction with the electrolyte layer increased with increasing sintering temperature.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sintering-shrinkage behavior as a function of the temperature for La0.58Sr0.4Fe0.6Cu0.2Co0.2O3−δ, La0.58Sr0.4Fe0.7Cu0.1Co0.2O3−δ, La0.58Sr0.4Co0.2Fe0.8O3−δ, and pretreated La0.58Sr0.4Fe0.6Cu0.2Co0.2O3−δ at 800°C

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Figure 2

Average current density values between 650°C and 800°C of the tested cells in comparison with the values obtained from cells with LSCF cathode (gray area). The light colored region shows values between 95% probability and maximum or minimum measured performance. The dark colored region is related to values within 95% probability.

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Figure 3

SOFC with La0.58Sr0.4Fe0.8Cu0.2O3−δ cathode (sintering temperature: 1050°C) after performance test

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Figure 4

SEM micrographs of the cross sections of SOFCs with cathode type La0.58Sr0.4Fe0.6Cu0.2Co0.2O3−δ with various sintering temperatures of the cathode: (a) 900°C; (b) 950°C; (c) 1000°C; and (d) 1050°C

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