Journal
SOLID STATE IONICS
Volume 177, Issue 19-25, Pages 2029-2032Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2006.06.018
Keywords
SOFC; mixed conducting anodes; symmetrical cells; hydrogen/water reaction
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Symmetrical cells consisting of Ni-Y0.20Ti0.18SZr0.62O1.90 (Ni-YZT) cermet electrodes on a Ni-YSZ support have been investigated with respect to the hydrogen/water partial pressures. Impedance spectra at open circuit potential were obtained as function of temperature and analysed in terms of a fractal finite length Gerischer Impedance. For fine and coarse microstructures of the Ni-YZT electrodes, a consistent set of model parameters could be obtained. The results indicate that surface diffusion rather than bulk diffusion plays a role in the hydrogen/water reaction but also that a fine-grained fraction in the mixed conducting YZT phase is advantageous for the overall electrode performance and the surface exchange reaction. (c) 2006 Elsevier B.V. All rights reserved.
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