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China-Japan Workshop on Solid Oxide Fuel Cells

La0.6Sr0.4Co0.2Fe0.8O3Ag Composite Cathode for Intermediate-Temperature Solid Oxide Fuel Cells

[+] Author and Article Information
Y. Sakitou, A. Hirano, N. Imanishi

Department of Chemistry for Materials, Faculty of Engineering, Mie University, 1577 Kurimamachiyacho, Tsu, Mie 514-8507, Japan

Y. Takeda1

Department of Chemistry for Materials, Faculty of Engineering, Mie University, 1577 Kurimamachiyacho, Tsu, Mie 514-8507, Japan

Y. Liu, M. Mori

Materials Science Research Laboratory, Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(3), 031207 (May 27, 2008) (4 pages) doi:10.1115/1.2930764 History: Received July 31, 2007; Revised February 07, 2008; Published May 27, 2008

The composite electrode of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and Ag was examined as an air electrode for intermediate-temperature solid oxide fuel cells. Two types of LSCF/Ag composite electrodes were prepared. One was made by firing the printed sheet of LSCF-GDC (10mol%Gd2O3 doped CeO2)-Ag powder mixture on the GDC/8mol%Y2O3 doped zirconia (YSZ) electrolyte, and the other was prepared by firing the LSCF electrode on GDC/YSZ infiltrating a AgNO3 solution in the pores of the electrode. In both cases, the cathode polarization overpotentials were reduced by the addition of Ag into LSFC. The power density of anode support cells with the LSCF electrode was increased from 0.28Wcm2to0.34Wcm2 at 600°C by infiltrating a AgNO3 solution into the electrode.

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References

Figures

Grahic Jump Location
Figure 1

I-V characteristics of oxygen reduction on the LSCF-GDC-Ag (Ag0.8Pd0.2 and Ag2O) electrode at 700°C

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Figure 2

Scanning electron microscopy (SEM) images of LSCF-GDC-Ag

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Figure 3

Time dependence of I-V characteristics for the LSCF-GDC electrode infiltrating a AgNO3 solution at 700°C

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Figure 4

Discharge performance of the Ni-YSZ/YSZ/ LSCF-Ag cell at 700°C, 600°C, and 500°C; (a) LSCF, (b) LSCF infiltrating a AgNO3 solution, and (c) LSCF infiltrating a AgNO3 solution with citric acid

Grahic Jump Location
Figure 5

EPMA image of the close section of the LSCF electrode infiltrating a AgNO3 solution with citric acid

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