Quantitative Comparison of Mixed Conducting SOFC Cathode Materials by Means of 
Thin Film Model Electrodes

Baumann, F. S.; Fleig, J.; Cristiani, G.; Stuhlhofer, B.; Habermeier, H.-U.; Maier, J.

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Quantitative Comparison of Mixed Conducting SOFC Cathode Materials by Means of Thin Film Model Electrodes

Baumann, F. S., Fleig, J., Cristiani, G., Stuhlhofer, B., Habermeier, H.-U., & Maier, J. (2007). Quantitative Comparison of Mixed Conducting SOFC Cathode Materials by Means of Thin Film Model Electrodes. Journal of The Electrochemical Society, 154(9), B931-B941.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-B7CD-D Version Permalink: https://hdl.handle.net/21.11116/0000-000E-B7CE-C

Genre: Journal Article

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Creators:
Baumann, F. S.¹, Author
Fleig, J.¹, Author
Cristiani, G.², Author
Stuhlhofer, B.², Author
Habermeier, H.-U.^{1, 2, 3}, Author
Maier, J.¹, Author

Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483
2Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370497
3Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370480

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Abstract: Geometrically well-defined model electrodes have been employed to unambiguously elucidate the individual resistive and capacitive processes of various solid oxide fuel cell cathodes by means of impedance spectroscopy. The measurements were performed on dense, thin film-type microelectrodes of La1-xSrxCo1-yFeyO3-delta and related perovskite-type materials prepared by pulsed laser deposition and photolithography. It was found that the substitution of the A-site cation La in La1-xSrxCo1-yFeyO3-delta by Sm and especially by Ba leads to a strong enhancement of the surface exchange kinetics, whereas a variation of the Co/Fe ratio between 0 and 1 has only little effect on this quantity at temperatures around 750 S C. Furthermore, it has been studied how the electrochemical activation effect, i.e., the strong reduction of the surface exchange resistance after application of a large dc bias, depends on composition. (C) 2007 The Electrochemical Society.

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Language(s): eng - English

Dates: Date issued: 2007

Publication Status: Issued

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Rev. Type: Peer

Identifiers: eDoc: 338717
ISI: 000248984600016

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Title: Journal of The Electrochemical Society

Source Genre: Journal

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Pages: - Volume / Issue: 154 (9) Sequence Number: - Start / End Page: B931 - B941 Identifier: ISSN: 0013-4651