Skip to main content Accessibility help
×
Home

Materials Development for Solid Oxide Fuel Cells Using Qualitative Models

  • Klaus Schmid (a1), Volker Krebs (a1), Albert Krügel (a2), Ellen Ivers-Tiée (a2) and Sven Schäfer (a2)...

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.

Copyright

References

Hide All
[1] Ivers-Tiée, E., Weber, André, and Herbstritt, Dirk. Materials and technologies for SOFC-components. Journal of the European Ceramic Society, 21:18051811, 1811.
[2] Weber, A., Müller, A., Herbstritt, D., and Ivers-Tiée, E.. Characterization of SOFC single cells. In Proceedings of SOFC VII, pages 952962. The Electrochem. Soc., 2001.
[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.
[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):582589, 1996.
[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.
[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.
[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.
[8] Driankov, D., Hellendoorn, H., and Reinfrank, M.. An Introduction to Fuzzy Control. Springer-Verlag, Berlin, 1993.
[9] Schäfers, E.. Dynamische Fuzzy-Systeme zur qualitativen Proze modellierung. Fort-schritt-Berichte VDI Reihe 8 Nr. 745. VDI Verlag, Düsseldorf, 1999. Dissertation.
[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.

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed