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Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 14: Functional Materials - Hydrogen

MM 14.4: Talk

Monday, March 11, 2013, 16:30–16:45, H26

Synthesis and characterization of nanoparticulate La0.6Sr0.4CoO3−δ cathodes for thin film solid oxide fuel cells — •Cahit Benel1,2,3, Azad J. Darbandi1,2, Anna Evans4, René Tölke4, Michel Prestat4, and Horst Hahn1,21Institute for Nanotechnology, Karlsruhe Institute of Technology, Germany — 2Joint Research Laboratory Nanomaterials, Technische Universität Darmstadt and Karlsruhe Institute of Technology, Germany — 3Center for Functional Nanostructures, Karlsruhe Institute of Technology, Germany — 4Nonmetallic Inorganic Materials, ETH Zurich, Switzerland

Solid oxide fuel cell cathode materials with mixed ionic and electronic conductivity (MIEC) such as strontium doped lanthanum cobalt oxide (La0.6Sr0.4CoO3−δ) show enhanced oxygen reduction kinetics compared to the conventional cathode materials. In this work, nanocrystalline La0.6Sr0.4CoO3−δ (LSC) powder with ultrafine microstructure and high specific surface area (60 m2/g) was synthesized via salt-assisted spray pyrolysis method. Nanoparticulate cathode thin films of LSC and LSC-GDC (Gadolinium doped ceria) with thicknesses between 150 and 500 nm were prepared via single step spin coating of water-based nanodispersions on yttria stabilized zirconia (YSZ) substrates. LSC cathode thin films (250 nm) with 30 wt% GDC content exhibit the lowest area specific resistance (ASR) values of 0.32, 0.78 and 2.04 Ω.cm2 in ambient air at 650, 600 and 550 C, respectively. The future work will focus on detailed chemical and microstructural analysis of the nanoparticulate thin film cathodes to gain more understanding on the electrochemical processes.

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