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

Bernard A. Boukamp, M. Verbraeken, David H.A. Blank, P. Holtappels

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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
Original languageUndefined
Pages (from-to)2539-2541
Number of pages4
JournalSolid state ionics
Volume177
DOIs
Publication statusPublished - 2006

Keywords

  • METIS-235028
  • IR-59212

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