Chapter 6. Degradation Mechanism of Metal Supported Atmospheric Plasma Sprayed Solid Oxide Fuel Cells

  1. Narottam P. Bansal,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. D. Hathiramani,
  2. R. Vaßen,
  3. J. Mertens,
  4. D. Sebold,
  5. V. A. C. Haanappel and
  6. D. Stöver

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291337.ch6

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4

How to Cite

Hathiramani, D., Vaßen, R., Mertens, J., Sebold, D., Haanappel, V. A. C. and Stöver, D. (2008) Degradation Mechanism of Metal Supported Atmospheric Plasma Sprayed Solid Oxide Fuel Cells, in Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 4 (eds N. P. Bansal, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291337.ch6

Author Information

  1. Forschungszentrum Jülich GmbH Institute for materials and processes in energy systems 52425 Jülich, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080542

Online ISBN: 9780470291337

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Keywords:

  • electrolyte;
  • chromium;
  • metallic;
  • microstructure;
  • monochromator

Summary

Sufficient thermal shock resistance, good thermal conductivity, as well as its solderability makes metallic supports highly attractive for SOFCs used in auxiliary power units (APUs). It is known that metallic supported SOFCs based on ferritic steels show high degradation rates during operation. Life times of such SOFCs are in the range of 200 h instead of up to 5000 h required for typical mobile applications. To solve this problem it is important to identify the mechanism responsible for the degradation.

SOFCs were produced by subsequently atmospheric plasma spraying of the anode (NiO/YSZ) and the electrolyte layer (YSZ) on top of porous metallic substrates. The cathode (LSFC) was applied by screen printing. Two different types of alloys were used as metallic substrates, Crofer22APU first (ThyssenKrupp) and the ODS alloy ITM-14 (Plansee). Electrochemical tests were performed for 200 h at 800°C under a constant current load.

Possible degradation mechanisms were listed and systematic experiments were designed to study the individual contribution of each degradation process. From both the characterization of the single cell tests as well as the individual experiments for each degradation mechanism, it can be concluded that chromium diffusion from the metallic support to the anode layer seems to be responsible for the high degradation rates. Other mechanism like degradation of the metallic substrates due to oxidation or the formation of La2Z2rO7 or SrZrO3 along the electrolyte-cathode interface does only play a minor role to the total degradation of the SOFC during the first 200 h.