Assembling single cells to create a stack: The case of a 100 W microtubular anode-supported solid oxide fuel cell stack

  • Nigel M. Sammes
  • Roberto Bove
  • Yanhai Du
Fuel Cell Technology

Abstract

Microtubular solid oxide fuel cell systems have many desirable characteristics compared with their planar counterparts; however, there are many obstacles and difficulties that must be met to achieve a successful and economically viable manufacturing process and stack design. Anode-supported tubes provide an excellent platform for individual cells. They allow for a thin electrolyte layer, which helps to minimize polarization losses, to be applied to the outside of the tube, thus avoiding the difficulty of coating the inside of an electrolyte or cathode-supported tubes, or the stack design problem of having a fuel chamber if the anode is on the outside of the tube. This article describes the fabrication of a traditional (Ni-YSZ) anode tube via extrusion of a plastic mass through a die of the required dimensions. The anode tubes were dried before firing, and tests were performed on the tubes to determine the effects of prefiring temperature on porosity. The porous tubes had a vacuum applied to the inside while being submerged in aqueous electrolyte slurry. Various parameters were examined, including vacuum pressure, submergence time, and drying conditions, and were studied using microscopy. Cathode coatings (based on both doped lanthanum manganite and doped lanthanum cobaltite) were applied using a brush-painting technique, and were optimized as a function of paint consistency, drying conditions, and firing temperatures. The finished tubes were then stacked in an array to provide the specific current/voltage requirements, using a brazing technique. This article will describe the output characteristics of a single cell and a small stack (of 100 W designed power output).

Keywords

anode support brazing extrusion solid oxide fuel cell (SOFC) stack 

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References

  1. 1.
    J.P. Strakey, M. Williams, W.A. Surdoval, and S.C. Singhal, U.S. DOE Solid Oxide Fuel Cell Program, Proceedings of Sixth European Solid Oxide Fuel Cell Forum, European Fuel Cell Forum, Lucerne, Switzerland, 2002, Vol. 1, p 48–59Google Scholar
  2. 2.
    G.A. Tompsett, C. Finnerty, K. Kendall, T. Alston, and N.M. Sammes, Novel Applications for Micro-SOFCs, J. Power Sources, 2000, 86, p 376–382CrossRefGoogle Scholar
  3. 3.
    S.C. Singhal, Advances in Solid Oxide Fuel Cell Technology, Solid State Ionics, 2000, 135, p 305–313CrossRefGoogle Scholar
  4. 4.
    M. Dokiya, SOFC System Technology, Solid State Ionics, 2002, 152–153, p 383–392CrossRefGoogle Scholar
  5. 5.
    H. Tu and U. Stimming, Advances, Aging Mechanisms and Lifetime in Solid-Oxide Fuel Cells, J. Power Sources, 2004, 127, p 284–293CrossRefGoogle Scholar
  6. 6.
    E G & G Technical services, Inc., Fuel Cell Handbook, 6th ed., U.S. Department of Energy, 2002Google Scholar
  7. 7.
    J. Larminie and A. Dicks, Fuel Cell Systems Explained. London, UK: J. Wiley and Sons, LTD, 2000Google Scholar
  8. 8.
    S. Vora, “Small-Scale Low Cost SOFC Power System,” Paper presented at the SECA Annual Workshop and Core Technology (Boston, MA), Department of Energy and NETL, May 2004Google Scholar
  9. 9.
    G. Agnew and A. Spangler, 2004, “Reducing Fuel Cell System Costs without Lowering Operating Temperature,” Paper presented at the 2nd International Conference on Fuel Cells Science Engineering and Technology (Rochester, NY), ASME, June 2004Google Scholar
  10. 10.
    P. Banace, N.P. Brandon, B. Girvan, P. Holbeche, S. O’ Dea, and B.C.H. Steele, J. Power Sources, 2004, 131, p 86–90CrossRefGoogle Scholar
  11. 11.
    J. Love and R. Ratnaraj, Operation of CFCL’s All-Ceramic Stack Technology, Proceedings of Sixth European Solid Oxide Fuel Cell Forum, European Fuel Cell Forum, 2004, Vol. 1, p 355–362Google Scholar
  12. 12.
    K. Ogasawara, Y. Baba, K. Fujita, H. Kameda, H. Yakabe, Y. Matsuzaki, and T. Sakurai, Development of Anode Supported Planar SOFC with Metallic Interconnectors Operated at Reduced Temperature, Proceedings of Sixth European Solid Oxide Fuel Cell Forum, European Fuel Cell Forum, 2004, Vol. 1, 2004, p 394–400Google Scholar
  13. 13.
    B. Zhu, Functional Ceria-Salt-Composite Materials for Advanced ITSOFC Applications, J. Power Sources, 2003, 114, p 1–9CrossRefGoogle Scholar
  14. 14.
    Y. Du and N.M. Sammes, J. Power Sources, 2004, 136, p 66–71CrossRefGoogle Scholar
  15. 15.
    Y. Du, “Fabrication and Characterization of Micro-Tubular Solid Oxide Fuel Cells,” Ph.D. dissertation, University of Waikato, 2004Google Scholar
  16. 16.
    Y. Du and N.M. Sammes, Fabrication and Properties of Anode Supported Tubular Solid Oxide Fuel Cells, J. Eur. Ceram. Soc., 2001, 21(6), p 727–735CrossRefGoogle Scholar
  17. 17.
    Y. Du, N.M. Sammes, and G.A. Tompsett, Fabrication of Tubular Electrolytes for Solid Oxide Fuel Cells Using Strontium and Magnesium Doped LaGaO3 Materials, J. Eur. Ceram. Soc., 2001, 20(7), p 959–965CrossRefGoogle Scholar
  18. 18.
    Y. Du, N.M. Sammes, G.A. Tompsett, D. Zhang, J. Swan, and M. Bowden, Extruded Tubular Strontium and Magnesium-Doped Lanthanum Gallate, Gadolinium-Doped Ceria, and Yttria Stabilized Zirconia Electrolytes, J. Electrochem. Soc., 2003, 150, p 74-A78CrossRefGoogle Scholar
  19. 19.
    R. Bove, N.M. Sammes, and P. Lunghi, “Design of a Tubular SOFC Stack Aided by Numerical Simulations,” Paper presented at Fuel Cell Seminar 2004 (San Antonio, TX), Fuel Cell Seminar Organizing Committee, Nov 2004Google Scholar
  20. 20.
    N.Q. Minh and T. Takahashi, Science and Technology of Ceramic Fuel Cells, Amsterdam: Elsevier, 1995Google Scholar
  21. 21.
    A.V. Durov, B.D. Kostjuk, A.V. Shevchenkoand, and Y.V. Naidich, Joining of Zirconia to Metal with Cu-Ga-Ti and Cu-Sn-Pb-Ti Fillers, Mater. Sci. Eng., 2000, A290, p 186–189Google Scholar
  22. 22.
    W.B. Hanson, K.I. Ironside, and S.A. Fernie, Active Metal Brazing of Zirconia, Acta Mater, 2000, 48, p 4673–4676CrossRefGoogle Scholar
  23. 23.
    D.R. Lide, CRC Handbook of Chemistry and Physics, 77th ed., Boca Raton, FL: CRC Press, 1996Google Scholar
  24. 24.
    A. Basak, R. England, and N.M. Sammes, Determination of the Mechanical integrity of Ceramic-to-Metal Braze Joints in SOFC Interconnect Applications, Proceedings of Sixth European Solid Oxide Fuel Cell Forum, European Fuel Cell Forum, Lucerne, Switzerland, 2004, Vol. 2, p 950–959Google Scholar
  25. 25.
    R. Bove and N.M. Sammes, Optimal SOFC Size Design for Minimal Cost of Electricity Achievement, Fuel Cells Science and Technologies, ASME, 2005, Vol. 2, p 9–14Google Scholar

Copyright information

© ASM International 2006

Authors and Affiliations

  • Nigel M. Sammes
    • 1
  • Roberto Bove
    • 1
  • Yanhai Du
    • 2
  1. 1.Mechanical Engineering DepartmentUniversity of ConnecticutStorrs
  2. 2.Connecticut Global Fuel Cell CenterUniversity of ConnecticutStorrs

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