Title: La0.6Sr0.4CoO3-δ (LSC) thin film electrodes with very fast oxygen reduction kinetics prepared by a solgel route
Language: English
Authors: Januschewsky, Judith 
Stoeger-Pollach, Michael 
Kubel, Frank 
Friedbacher, Gernot
Fleig, Juergen
Category: Research Article
Issue Date: 2012
Journal: Zeitschrift für Physikalische Chemie
ISSN: 2196-7156
La0.6Sr0.4CoO3-δ (LSC) thin film electrodes of about 80 nm thickness were prepared via a sol-gel route on yttria-stabilized zirconia (YSZ) and gadolinium doped ceria (GDC) solid electrolytes. Impedance measurements on microelectrodes fabricated from these films revealed very low polarization resistances for electrochemical oxygen exchange at intermediate temperatures (500–600 ºC). Prerequisite for the very fast oxygen reduction kinetics was a limitation of the preparation (annealing) temperature to 600 ºC. Already after ca. 15 minutes annealing of the sol-gel prepared layer at this temperature, electrodes were electrochemically highly active despite low crystallinity (almost XRD amorphous). LSC electrodes on GDC showed much higher polarization resistances. However, this originated from an additional interfacial resistance rather than from kinetically slow LSC surfaces.
Keywords: Solid State Electrochemistry; Oxygen Reduction; Lanthanum Cobaltite; Impedance; Microelectrode
DOI: 10.1524/zpch.2012.0278
Library ID: AC15176465
URN: urn:nbn:at:at-ubtuw:3-3893
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
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