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Materials Development for Solid Oxide Fuel Cells Using Qualitative Models

Published online by Cambridge University Press:  17 March 2011

Klaus Schmid ,
Volker Krebs ,
Albert Krügel ,
Ellen Ivers-Tiée  and
Sven Schäfer
Klaus Schmid
Affiliation:
Institut für Regelungs- und Steuerungssysteme, Universität Karlsruhe (TH), Kaiserstraβe 12, D-76131 Karlsruhe, Germany
Volker Krebs
Affiliation:
Institut für Regelungs- und Steuerungssysteme, Universität Karlsruhe (TH), Kaiserstraβe 12, D-76131 Karlsruhe, Germany
Albert Krügel
Affiliation:
Institut für Werksto e der Elektrotechnik, Universität Karlsruhe (TH), Kaiserstraβe 12, D-76131 Karlsruhe, Germany
Ellen Ivers-Tiée
Affiliation:
Institut für Werksto e der Elektrotechnik, Universität Karlsruhe (TH), Kaiserstraβe 12, D-76131 Karlsruhe, Germany
Sven Schäfer
Affiliation:
Institut für Werksto e der Elektrotechnik, Universität Karlsruhe (TH), Kaiserstraβe 12, D-76131 Karlsruhe, Germany
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Abstract

Solid Oxide Fuel Cells (SOFC) are high temperature energy converters. When an SOFC is operated for the rst time, a substantial increase in cell performance is observed which is caused by microstructural changes at the cathode/electrolyte interface. To optimize the resulting formation of the interface, a dynamic model is required that represents the relations between materials compositions, operating conditions, electric current, and microstructure.

Building a model based on chemical reaction equations fails because of the high complexity of the interface reactions. Therefore, this contribution presents an interdisciplinary approach to modeling in materials development by applying computational intelligence techniques. Qualitative models are used to formalize the expert knowledge about the irreversible materials changes at the cathode/electrolyte interface. Fuzzy if-then rules represent the dynamic behavior of the microstructural formation. The resulting model enables the application of simulations instead of time-consuming experiments and thus allows the systematic optimization of the startup process.

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References

[1] Ivers-Tiée, E., Weber, André, and Herbstritt, Dirk. Materials and technologies for SOFC-components. Journal of the European Ceramic Society, 21:18051811, 1811.Google Scholar
[2] Weber, A., Müller, A., Herbstritt, D., and Ivers-Tiée, E.. Characterization of SOFC single cells. In Proceedings of SOFC VII, pages 952–962. The Electrochem. Soc., 2001.Google Scholar
[3] Schmid, K., Krebs, V., Schichlein, H., Weber, A., Krügel, A., and Ivers-Tiée, E.. Optimization of the startup process of solid oxide fuel cells (SOFC). In Proceedings of Materials Week 2001 (on CD-ROM), Munich, October 2001.Google Scholar
[4] Weber, A., Männer, R., Waser, R., and Ivers-Tiée, E.. Interaction between microstructure and electrical properties of screen printed cathodes in SOFC single cells. Denki Kagaku, J. of the Electrochemical Society of Japan, 64(6):582–589, 1996.Google Scholar
[5] Labrincha, J. A., Frade, J. R., and Marques, F. M. B.. La2Zr2O7 formed at ceramicelectrode/YSZ contacts. Journal of Materials Science, 28:28093815, 3815.Google Scholar
[6] Lee, H. Y. and Oh, S. M.. Origin of cathodic degradation and new phase formation at the La0:9Sr0:1MnO3 – YSZ interface. Solid State Ionics, 90:133140, 140.Google Scholar
[7] Mitterdorfer, A. and Gauckler, L. J.. La2Zr2O7 formation and oxygen reduction kinetics of the La0:85Sr0:15MnyO3–YSZ system. Solid State Ionics, 111:185218, 218.Google Scholar
[8] Driankov, D., Hellendoorn, H., and Reinfrank, M.. An Introduction to Fuzzy Control. Springer-Verlag, Berlin, 1993.Google Scholar
[9] Schäfers, E.. Dynamische Fuzzy-Systeme zur qualitativen Proze modellierung. Fort-schritt-Berichte VDI Reihe 8 Nr. 745. VDI Verlag, Düsseldorf, 1999. Dissertation.Google Scholar
[10] Schmid, K. and Krebs, V.. Qualitative modeling and controller design using dynamic fuzzy systems. In Proceedings of EUFIT'99 (on CD-ROM), Aachen, 1999. Verlag Mainz.Google Scholar