Chapter 42. Status of the Sofco Planar Solid Oxide Fuel Cell

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. L. A. Xue,
  2. T. L. Cable and
  3. E. A. Barringer

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch42

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3

How to Cite

Xue, L. A., Cable, T. L. and Barringer, E. A. (2003) Status of the Sofco Planar Solid Oxide Fuel Cell, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: A: Ceramic Engineering and Science Proceedings, Volume 24, Issue 3 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294802.ch42

Author Information

  1. SOFCo-EFS, McDermott International, Inc. 1562 Beeson Street Alliance, Ohio 44601

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375839

Online ISBN: 9780470294802

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Keywords:

  • multi-layer ceramic;
  • electrodes;
  • thermal expansion;
  • yttna-stabilized zirconia;
  • electrical measurements

Summary

SOFCo is currently developing a multi-layer, co-fired pSOFC stack that will provide superior performance and reliability at reduced costs relative to competing SOFC designs. Our approach combines state of the art SOFC materials with the manufacturing technology and infrastructure established for multi-layer ceramic (MLC) packages for the microelectronics industry. The rationale for using MLC packaging technology is that high-quality, low-cost manufacturing has been demonstrated at high volumes. With the proper selection of SOFC materials, implementation of MLC fabrication methods offers unique designs for stacks (cells and interconnects) that are not possible through traditional fabrication methods. The advantages of the multi-layer, co-fired pSOFC approach are: the number of process steps is reduced to enable lower manufacturing costs; superior interfacial contact between the electrochemically active components to achieve improved performance; and the process cost structure is not only well established but is proven commercially viable. To fully derive the benefits of the co-fired concept, significant changes to the process techniques are required. Combinations of tape casting and screen-printing are being used to manufacture a fully functional fuel cell and interconnect with a minimum number of process steps. The greatest challenge in this development is to co-fire the electrolyte and the electrodes. SOFCo has successfully demonstrated the feasibility of co-firing SOFC single cells, not withstanding constraints posed by sintering temperatures and materials interactions. Another challenge is the stacking/interconnect issue in our all-ceramic SOFC utilizing ceramic interconnects with conducting vias. Resistance stack experiments have been devised to evaluate the stack interconnecting issues. This approach allows us to separately study the interconnecting issues without interference from electrochemical effects from the cells. Testing results show the importance of in-plane conductivity in the stacks. This paper provides an overview of the SOFCo multi-layer, co-fired stack approach and a summary of the development status.