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Journal of Materials Science

, Volume 42, Issue 24, pp 10152–10159 | Cite as

Mixed conducting oxides YxZr1−xyTiyO2−x/2 (YZT) and corresponding Ni/YZT cermets as anode materials in an SOFC

  • X. Mantzouris
  • N. Zouvelou
  • V. A. C. Haanappel
  • F. TietzEmail author
  • P. Nikolopoulos
Article

Abstract

The physical properties of mixed-conducting oxides in the ternary system Y2O3–ZrO2–TiO2 with the general formula YxZr1−xyTiyO2−x/2 (YZT, where 0.133 < x < 0.25 and 0 < y < 0.15) are presented and evaluated in terms of an application as anode materials in solid oxide fuel cells (SOFCs). The total electrical conductivity of the ceramics with cubic fluorite structure in air mainly depends on the Ti content and decreases at 900 °C by about one order of magnitude from y = 0 to y = 0.15. Comparing the conductivity of contributions at 900 °C in Ar/4% H2 the highest contributions of electronic conductivity were obtained for y = 0.15. For the Ni/YZT cermets, the enhanced adherence at the metal/ceramic interface, compared to Ni/8YSZ (8 mol% yttria stabilised zirconia), results in a better long-term stability in terms of electrical conductivity and microstructure after 1,000 h of annealing at 1,000 °C in reducing atmosphere. The electrochemical performance, tested in fuel cells with Ni/8YSZ, Ni/Y0.20Zr0.75Ti0.05O1.9 and Ni/Y0.20Zr0.70Ti0.10O1.9 anodes, decreased for Ni/Y0.20Zr0.70Ti0.10O1.9 under steam reforming conditions, most likely due to the reduced ionic conductivity of this specific YZT ceramic.

Keywords

Ceramic Phase Percolation Limit Total Electrical Conductivity Anode Substrate Y2O3 Content 

Notes

Acknowledgements

Financial support is gratefully acknowledged from the Greek-German (GRC 01/099) bilateral co-operation project and from the E.U. Integrated Project REALSOFC (No. SES6-CT-2003–50261). The authors thank the colleagues at IEF—S. Heinz, V. Bader, G. Blaß, W. Herzhof, C. Tropartz—for technical assistance and M. Michulitz (FZJ-ZCH) for chemical analysis with ICP-OES.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • X. Mantzouris
    • 1
  • N. Zouvelou
    • 1
  • V. A. C. Haanappel
    • 2
  • F. Tietz
    • 2
    Email author
  • P. Nikolopoulos
    • 1
  1. 1.Department of Chemical EngineeringUniversity of PatrasPatrasGreece
  2. 2.Forschungszentrum Jülich GmbHInstitut für Energieforschung (IEF)JulichGermany

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