Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 21: Topical Session Nanoporous Functional Materials - Poster

MM 21.1: Poster

Dienstag, 24. März 2009, 14:45–16:30, P4

Synthesis and Characterization of Nanocomposites for Application as Nanoporous Cathodes in Solid Oxide Fuel Cell — •Azad J. Darbandi1,2 and Horst Hahn2,31Center for Functional Nanostructures, Universität Karlsruhe (TH) — 2Gemeinschafts Labor Nanomaterialien, Technische Universität Darmstadt und Forschungszentrum Karlsruhe — 3Institut für Nanotechnologie, Forschungszentrum Karlsruhe

A recent trend of research on Solid Oxide Fuel Cells is the lowering of the operating temperature for example for Low Temperature Micro-SOFCs. The present work describes the synthesis and a single step coating process of thin film nanocrystalline functional cathode layers. Single phase nanocrystalline (LSCF) cathode powder with ultrafine microstructure and high specific surface area was synthesized via a unique spray pyrolysis process. The powders have been characterized by various methods such as high temperature in-situ X-ray diffraction, DSC-TGA, ICP, HRSEM, TEM, Nitrogen adsorption, Particle size distribution and Zeta-Potential. Yttria stabilized Zirconia substrates were coated with nanodispersion containing LSCF and Gadolinium doped Ceria particles. The electrochemical impedance spectroscopy was carried out on symmetrical samples in dependence of temperature and oxygen partial pressure. The Area Specific Resistance of 50 and 140 mΩ.cm^2 at 700°C and 650°C, respectively, are considerably lower than values reported in literature. High electrochemical activity at low thickness, cost effective coating process and low sintering temperatures are beneficial for low temperature Micro-SOFCs application.

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