Chapter 23. Properties of (Mn,Co)3O4 Spinel Protection Layers for SOFC Interconnects

  1. Narottam P. Bansal,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Zhenguo Yang,
  2. Xiao-Hong Li,
  3. Gary D. Maupin,
  4. Prabhakar Singh,
  5. Steve P. Simner,
  6. Jeffry W. Stevenson,
  7. Guan-Guang Xia and
  8. Xiaodong Zhou

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291337.ch23

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

Yang, Z., Li, X.-H., Maupin, G. D., Singh, P., Simner, S. P., Stevenson, J. W., Xia, G.-G. and Zhou, X. (2006) Properties of (Mn,Co)3O4 Spinel Protection Layers for SOFC Interconnects, 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.ch23

Author Information

  1. Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA 99352

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:

  • evaporation;
  • electrochemical;
  • dilatometer;
  • x-ray;
  • stoichiometry

Summary

Ferritic stainless steels are promising candidates for interconnect applications in low- and mid-temperature solid oxide fuel cells (SOFCs). A couple of issues however remain for this particular application, including chromium poisoning due to chromia evaporation, and long-term surface and electrical stability of the scale grown on these steels. Application of a manganese colbaltite spinel protection layer on the steels appears to be an effective approach to solve the issues. For an optimized performance, properties of Mn1+xCo2-xO4 (−0.5≤×≤1.5) spinels relevant to the protective coating application were investigated. It was found that the spinels with x around 0.5 demonstrated a good CTE match to ceramic cell components, high electrical conductivity, and thermal stability up to 1,250°C. The material suitability was confirmed by a long-term test on a Mn1.5Co1.5O4 protection layer that was thermally grown on Crofer22 APU, indicating the spinel protection layer not only significantly decreased the contact resistance between a LSF cathode and a stainless steel interconnect, but also inhibited the sub-scale growth on the stainless steel.