Chapter 47. Nanocomposite Electrodes for Solid Oxide Fuel Cells

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. M. M. Seabaugh,
  2. S. L. Swartz,
  3. R. B. Cooley and
  4. K. Hasinska

Published Online: 27 MAR 2008

DOI: 10.1002/9780470294802.ch47

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

Seabaugh, M. M., Swartz, S. L., Cooley, R. B. and Hasinska, K. (2003) Nanocomposite Electrodes for Solid Oxide Fuel Cells, 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.ch47

Author Information

  1. C. T. Holt, J. L. Jayjohn, and W. J. Dawson, NexTech Materials, Ltd. Worthington, OH 43085

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:

  • solid oxide fuel cells;
  • thermal expansion;
  • planar sofc architecture;
  • elastic modulus;
  • glass ceramics

Summary

Improved cathode materials are critical to the reduction of the operating temperature for solid oxide fuel cells (SOFCs). State-of-the-art cathodes in SOFCs require operating temperatures above 800°C to provide low interfacial resistance, and annealing temperatures of more than 1000°C to achieve sufficient adherence to the electrolyte layer. Additions of electrolyte material to the cathode have been shown to improve cathode behavior by the increasing the three-phase-boundary area where electrochemical reactions occur. In fact, the resistance of composite cathode materials is often much lower than expected from the increase in reaction area alone. A number of mechanisms have been proposed for this decrease, but none have been conclusively demonstrated. In conjunction with work on anode-supported SOFCs, NexTech Materials has developed screen-printing and annealing methods for depositing cathode coatings, and is evaluating the relationship between composition, surface area, and processing on the electrochemical performance of composite cathode materials. A nano-composite processing approach has been developed, which offers lower annealing temperatures and lower interfacial resistances compared to similar cathode materials prepared using conventional ceramic methods.