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Influence of protective layers on SOFC operation

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Abstract

Corrosion kinetics of ferritic alloys/steels (Crofer22APU, ITMLC, ZMG232L) were studied at high temperature. An extent of corrosion was evaluated by measuring the oxide scale thickness and the weight gain as a function of heating time. It is shown that even porous layer applied to interconnect can significantly reduce the rate of the steel oxidation. Contribution of the “oxide component” into the total degradation of the SOFC stack performance is estimated. Different protection materials and combinations were tested to analyze their influence on the processes of high temperature oxidation and long-term degradation of Fe-Cr steels. It has been shown that “more soft” materials on the basis of spinels (Mn(Co1 − x Fe x )2O4, Cu1 − x Ni x Mn2O4) are most suitable materials for the use as protective layers in comparison to perovskites. The efficiency of different protective materials was also tested in the real SOFC stacks designed in cooperation with company Staxera GmbH. It has been shown that applied spinel materials can effectively increase the long-term stability of the SOFC stacks.

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Authors and Affiliations

  1. Fraunhofer Institute for Ceramic Technologies and Systems, Dresden, Germany

    V. Sauchuk, S. Megel, E. Girdauskaite, N. Trofimenko, M. Kusnezoff & A. Michaelis

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  1. V. Sauchuk
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  2. S. Megel
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  3. E. Girdauskaite
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  4. N. Trofimenko
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  5. M. Kusnezoff
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  6. A. Michaelis
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Corresponding author

Correspondence to V. Sauchuk.

Additional information

Published in Russian in Elektrokhimiya, 2011, Vol. 47, No. 5, pp. 558–567.

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Sauchuk, V., Megel, S., Girdauskaite, E. et al. Influence of protective layers on SOFC operation. Russ J Electrochem 47, 522–530 (2011). https://doi.org/10.1134/S1023193511050107

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  • DOI: https://doi.org/10.1134/S1023193511050107

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