, Volume 6, Issue 1–2, pp 86–91 | Cite as

Microstructure of Ni/YSZ cermets according to particle size of precursor powders and their anodic performances in SOFC

  • Jong H. Jang
  • Ji H. Ryu
  • Seung M. Oh


Four different Ni/YSZ cermets were prepared by combining two sets of NiO and YSZ powders of different size. The microstructural change evolved during the course of electrode adhesion and cell operation was monitored using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The anodic activity was compared by analyzing the ∝ impedance spectra of four Ni/YSZ cermet (H2) / YSZ half cells at 1000 °C. Among the cermets, the one that prepared from the smaller NiO and larger YSZ powder showed the best anodic performances on aspects of the initial activity and long-term stability. This favorable performance is partly responsible to the presence of larger YSZ particles which provide a supporting matrix to suppress the microstructural change against Ni sintering and concomitant volume shrinkage, and partly to an easy formation of Ni channel for electronic conduction. Anodic performances of the other cermets were also discussed based on their microstructure.


Shrinkage Energy Dispersive Spectroscopy Microstructural Change Precursor Powder Volume Shrinkage 
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6. References

  1. [1]
    H. Itoh, T. Yamamoto, M. Mori, T. Horita, N. Sakai, H. Yokokawa, M. Dokiya, J. Electrochem. Soc.144, 641 (1997).Google Scholar
  2. [2]
    T. Fukui, S. Ohara, K. Mukai, Electrochemical and Solid-State Letters1, 120 (1998).Google Scholar
  3. [3]
    W. Huebner, H.U. Anderson, D.M. Reed, S.R. Sehlin, X. Deng, in: Proceedings of the 4th International Symposium on SOFC (M. Dokiya, O. Yamamoto, H. Tagawa, S.C. Singhal, Eds.) The Electrochemical Society, Pennington, NJ, 1995, p. 696.Google Scholar
  4. [4]
    T. Kawada, N. Sakai, H. Yokokawa, M. Dokiya, M. Mori, T. Iwata, J. Electrochem. Soc.137, 3042 (1990).Google Scholar
  5. [5]
    A. Ioselevich, A.A. Kornyshev, W. Lehnert, J. Electrochem. Soc.144, 3010 (1997).Google Scholar
  6. [6]
    B.A. Boukamp, Equivalent Circuit, a software program for ac-impedance data analysis, version 3.99, Univ. of Twente, The Netherlands (1992).Google Scholar
  7. [7]
    J.R. Macdonald, Solid State Ionics13, 147 (1984).Google Scholar
  8. [8]
    M. Kleitz, L. Dessemond, M.C. Steil, Solid State Ionics75, 107 (1995).CrossRefGoogle Scholar
  9. [9]
    S.P.S. Badwal, Solid State Ionics76, 67 (1995).CrossRefGoogle Scholar
  10. [10]
    S.H. Chu, M.A. Seitz, J. Solid State Chem.23, 297 (1978).CrossRefGoogle Scholar
  11. [11]
    J.R. Macdonald, W.B. Johnson, in: Impedance Spectroscopy Emphasizing Solid Materials and Systems (J.R. Macdonald, Ed.), John Wiley and Sons, New York, 1987, pp. 12–26.Google Scholar
  12. [12]
    J.F. McCahn, S.P.S. Badwal, J. Electrochem. Soc.129, 551 (1982).Google Scholar
  13. [13]
    H.Y. Lee, W.S. Cho, S.M. Oh, H.-D. Wiemhöfer, W. Göpel, J. Electrochem. Soc.142, 2659 (1995).Google Scholar

Copyright information

© IfI - Institute for Ionics 2000

Authors and Affiliations

  • Jong H. Jang
    • 1
  • Ji H. Ryu
    • 1
  • Seung M. Oh
    • 1
  1. 1.School of Chemical Engineering and Institute of Chemical Process College of EngineeringSeoul National UniversitySeoulKorea

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