Reactivity and Interdiffusion of Alternative SOFC Cathodes with Yttria Stabilized Zirconia, Gadolinia Doped Ceria and Doped Lanthanum Gallate Solid Electrolytes

  1. Dr. K. Grassie2,
  2. Prof. Dr. E. Teuckhoff3,
  3. Prof. Dr. G. Wegner4,
  4. Prof. Dr. J. Hausselt5 and
  5. Prof. Dr. H. Hanselka6
  1. G. Ch. Kostogloudis,
  2. G. Tsiniarakis,
  3. F. Riza and
  4. Ch. Ftikos

Published Online: 27 APR 2006

DOI: 10.1002/3527607420.ch30

Functional Materials, Volume 13

Functional Materials, Volume 13

How to Cite

Kostogloudis, G. Ch., Tsiniarakis, G., Riza, F. and Ftikos, Ch. (2000) Reactivity and Interdiffusion of Alternative SOFC Cathodes with Yttria Stabilized Zirconia, Gadolinia Doped Ceria and Doped Lanthanum Gallate Solid Electrolytes, in Functional Materials, Volume 13 (eds K. Grassie, E. Teuckhoff, G. Wegner, J. Hausselt and H. Hanselka), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607420.ch30

Editor Information

  1. 2

    Philips Forschungslaboratorium, Postfach 500145, 52085 Aachen, Germany

  2. 3

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

  3. 4

    Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany

  4. 5

    Forschungszentrum Karlsruhe, Postfach 3640, 76201 Karlsruhe, Germany

  5. 6

    Institut für Mechanik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39160 Magdeburg, Germany

Author Information

  1. National Technical University of Athens, Greece

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527302543

Online ISBN: 9783527607426

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Keywords:

  • functional materials;
  • SOFC cathodes with yttria stabilized zirconia;
  • gadolinia doped ceria and doped lanthanum gallate solid electrolytes;
  • reactivity;
  • interdiffusion

Summary

The chemical compatibility between the cathode composition Pr0.8Sr0.2Co0.2Fe0.8O3-δ and the electrolyte compositions yttria stabilized zirconia (YSZ), Ce0.8Gd0.2O1.9 (CGO) and La0.8Sr0.2Ga0.9Mg0.1O3-δ (LSGM) was investigated. Also, the influence of the substitution of Al for Fe on the reactivity of the cathode with YSZ was examined. All oxides were singlephase materials except for LSGM, which contained two additional phases, namely LaSrGa3O7 and LaSrGaO4. Two types of experiments were performed: (a) reactivity experiments by XRD in cathode/electrolyte powder mixtures and (b) diffusion experiments by SEM/EDX analysis in cathode/electrolyte double-layer pellets. Pr2Zr2O7, SrZrO3 and CoFe2O4 were formed by the interaction of the cathode materials with YSZ. Substitution by Al at the B-site of the perovskite cathode led to a decrease of its reactivity with YSZ. No reaction products were formed for powder mixtures of Pr0.8Sr0.2Co0.2Fe0.8O3-δ and CGO or LSGM electrolytes. High Co and Fe diffusion into LSGM was identified. Pr, La and Ga show a smaller tendency for diffusion. The diffusion of transition metal cations into LSGM electrolyte caused the destabilisation and disappearance of the second phases in the interdiffusion zone.