SOFC-anodes, proof for a finite-length type Gerischer impedance?


Boukamp, B.A. and Verbraeken, M. and Blank, D.H.A. and Holtappels, P. (2006) SOFC-anodes, proof for a finite-length type Gerischer impedance? Solid State Ionics, 177 . pp. 2539-2541. ISSN 0167-2738

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Abstract:The impedance of a symmetric cell with Ni/Ti-doped YSZ cermet anodes was measured as function of ambient (PH2, PH2O) and temperature.
The impedances showed identical shapes with a minor dispersive contribution in the high frequency region and a dominating dispersion down to
0.01 Hz. The characteristic shape of this dispersion was clearly in between a finite-length Warburg (FLW) and a Gerischer impedance. Analysis of
the dispersion in the Bode representation, after subtraction of the high frequency contribution, showed a clear relation with the Gerischer
impedance. Assuming a finite-length constraint led to quite reasonable modelling of the data. The parameter set of this finite-length Gerischer
showed a consistent dependence on PH2, PH2O. A qualitative interpretation of this modified Gerischer is presented
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Copyright:© 2006 Elsevier
Science and Technology (TNW)
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