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

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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.
Item Type:Article
Copyright:© 2006 Elsevier
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/59225
Official URL:http://dx.doi.org/10.1016/j.ssi.2006.06.018
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