Preparation and electrochemical characterisation of supporting SOFC–Ni–YZT anodes


Holtappels, P. and Verbraeken, M. and Vogt, U. and Blank, D.H.A. and Boukamp, B.A. (2006) Preparation and electrochemical characterisation of supporting SOFC–Ni–YZT anodes. Solid State Ionics, 177 . pp. 2029-2032. ISSN 0167-2738

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Abstract:Symmetrical cells consisting of Ni–Y0.20Ti0.18Zr0.62O1.90 (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.
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Copyright:© 2006 Elsevier
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