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RESEARCH PAPERS

The Electrochemical Performance of Anode-Supported SOFCs with LSM-Type Cathodes Produced by Alternative Processing Routes

[+] Author and Article Information
J. Mertens, C. Tropartz, W. Herzhof, H. P. Buchkremer

Institute for Materials and Processes in Energy Systems, Forschungszentrum Jülich, 52425 Jülich, Germany

V. A. Haanappel1

Institute for Materials and Processes in Energy Systems, Forschungszentrum Jülich, 52425 Jülich, Germanyv.haanappel@fz-juelich.de

1

Corresponding author.

J. Fuel Cell Sci. Technol 3(2), 125-130 (Dec 01, 2005) (6 pages) doi:10.1115/1.2173667 History: Received July 04, 2005; Revised December 01, 2005

The electrochemical performance of La0.65Sr0.3MnO3-type (LSM) anode-supported single cells, produced by alternative production processes, has been investigated at intermediate temperatures. In particular, three different variations of the production route were investigated in more detail: (1) the use of nonground LSM powder for the cathode current collector layer, (2) the use of noncalcined and nonground YSZ powder for the cathode functional layer, and (3) the use of tape casting versus warm pressing as the production process for anode substrates. Results from electrochemical measurements performed between 700 and 900°C with H2 (3vol%H2O) as fuel gas and air as the oxidant showed that performance increased with increasing grain size of the outer cathode current collector layer: the highest performance was achieved with nonground LSM powder. Furthermore, performance was not adversely influenced by the use of noncalcined and nonground YSZ for the cathode functional layer. Also the use of anode substrates with a thickness of about 0.7mm and produced by tape casting, instead of those with a thickness of about 1.5mm and applied by warm pressing, did not detrimentally affect the electrochemical performance of this type of SOFC.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM micrographs of the fracture surface of single cells with an LSM/YSZ CFL (mass ratio: 60∕40 (CFL-A6)) and an LSM CCCL. The CCCL was prepared by using different pastes with: (a) d90=2.47μm (CCCL-C); and (b) d90=26.0 (nonground) μm (CCCL-B).

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Figure 2

Current-voltage curves for a 16cm2 single cell at 750°C with different grain sizes for the CCCL (fuel gas: H2(3vol%)=1000ml∕min, oxidant: air=1000ml∕min)

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Figure 3

SEM micrographs of the fracture surface of single cells with a porous LSM CCCL (d90=2.47μm) at the top, followed by an LSM/YSZ CFL with (a) calcined YSZ, and (b) noncalcined and nonground YSZ. At the bottom of the micrographs the electrolyte (YSZ) is shown.

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Figure 4

Current-voltage curves for a 16cm2 single cell with an anode substrate produced by tape casting (pre-sintered at 1255°C) at various test temperatures (fuel gas: H2(3vol%)=1000ml∕min, oxidant: air=1000ml∕min)

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