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 La_0.6Sr_0.4CoO_3−δ cathodes for thin film solid oxide fuel cells — •Cahit Benel^1,2,3, Azad J. Darbandi^1,2, Anna Evans⁴, René Tölke⁴, Michel Prestat⁴, and Horst Hahn^1,2 — ¹Institute 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 (La_0.6Sr_0.4CoO_3−δ) show enhanced oxygen reduction kinetics compared to the conventional cathode materials. In this work, nanocrystalline La_0.6Sr_0.4CoO_3−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.