Abstract No.:
2707

 Scheduled at:
Wednesday, September 28, 2011, Saal B2.2 9:00 AM
Fuel Cells 2


 Title:
Deposition of composite LSCF-SDC and SSC-SDC cathodes by axial-injection plasma spraying

 Authors:
Jeffrey Harris* / University of Toronto, Canada
Olivera Kesler/ University of Toronto, Canada

 Abstract:
The performance of solid oxide fuel cell cathodes can be improved by increasing the number of electrochemical reaction sites. This is often done by using composite materials that consist of an ionic conductor and a mixed ionic and electronic conductor. LSCF-SDC (La0.6Sr0.4Co0.2Fe0.8O3-´ - Ce0.8Sm0.2O1.9) and SSC-SDC (Sm0.5Sr0.5CoO3-´ - Ce0.8Sm0.2O1.9) composite cathodes were manufactured by axial-injection atmospheric plasma spraying (APS). The plasma power was varied by changing the proportion of nitrogen in the plasma gas. The microstructures of cathodes produced with different plasma powers and standoff distances were characterized by scanning electron microscopy and gas permeation measurements. Particle velocity and surface temperature were measured in-flight to enhance understanding of the relationship between microstructure and spray parameters. The deposition efficiencies of these cathodes were calculated based on the mass of the sprayed cathode. Symmetrical cells were manufactured and electrochemically tested, with each cell containing two cathodes separated by a suspension plasma sprayed (SPS) yttria stabilized zirconia (YSZ) electrolyte.

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