Thermal Spraying and Performance of Graded Composite Cathodes as SOFC-Component
K. Barthel, S. Rambert
abstract
Porous compositionally graded composite cathodes containing (La0.8 Sr0.2)0.98MnO3 (LSM) and
ZrO2-12% Y2O3 (YSZ) were prepared by vacuum plasma spraying (VPS) and flame spraying (FS)
on prefabricated planar cells with 60 mm diameter. Besides microstructural observations their
electrochemical behavior has been investigated by impedance spectroscopy. The results of graded
cathodes compared with non-gradient- and bi-layered ones concerning the cathodic polarization
resistance between 750 and 950°C are discussed.
keywords:Solid Oxide Fuel Cells (SOFC); Flame spraying; Microstructure; Impedance spectroscopy; Polarization resistance; compositionally graded cathodes; vacuumplasma spraying
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