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Microstructure of sol-gel derived nanoscaled La0.6Sr0.4CoO 3-delta cathodes for intermediate-temperature SOFCs

: Dieterle, Levin; Bockstaller, Pascal; Gerthsen, Dagmar; Hayd, Jan; Tiffée, Ellen Ivers; Guntow, Uwe; Kübel, Christian


Singhal, S.C. ; Electrochemical Society -ECS-:
Solid Oxide Fuel Cells 12, SOFC XII : Papers presented at the Twelfth International Symposium on Solid Oxide Fuel Cells (SOFC-XII), held in Montreal, Canada, May 1-6, 2011
Pennington, NJ: ECS, 2011 (ECS transactions 35.2011, Nr.1)
ISBN: 978-1-56677-862-6 (CD-ROM)
ISBN: 978-1-60768-212-7
ISBN: 978-1-60768-236-3 (Print)
ISSN: 1938-5862
International Symposium on Solid Oxide Fuel Cells (SOFC) <12, 2011, Montreal>
Electrochemical Society (Meeting) <219, 2011, Montreal>
Conference Paper
Fraunhofer ISC ()

Nanocrystalline La 1-xSr xCoO 3-delta (LSC) thin films with a nominal Sr-content of x = 0.4 were deposited on Ce 0.9Gd 0.1O 1.95 electrolyte substrates by low-temperature sol-gel processing. Microstructure, element distribution and electrochemical properties of the LSC thin films were studied after thermal treatment, which included calcination and extended annealing at 700°C or 800°C. Transmission electron microscopy combined with Debye electron diffraction and electron tomography was applied for the investigation of the grain-size distribution and porosity. The local chemical composition and element distribution was analyzed by energy-dispersive X-ray spectrometry on the nanoscale. Area specific polarization resistances as low as 0.023 ohm cm 2 at 600°C were measured applying electrochemical impedance spectroscopy. These low resistance values are facilitated by a substantial increase of the inner surface area of the porous thin-film cathode and amplified by an enhanced surface exchange, resulting from precipitation of Co3O4