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Journal of Solid State Electrochemistry

, Volume 9, Issue 10, pp 674–683 | Cite as

Electrochemical characteristics of Ce0.8Gd0.2O1.9|La0.6Sr0.4CoO3-δ + Ce0.8Gd0.2O1.9 half-cell

  • Enn Lust
  • Gunnar Nurk
  • Silvar Kallip
  • Indrek Kivi
  • Priit Möller
Original Paper

Abstract

The analysis of the medium temperature half-cell Ce0.8Gd0.2O1.9|70 wt% La0.6Sr0.4CoO3-δ (LSCO) + 30 wt % Ce0.8Gd0.2O1.9 (CGO) has been made by electrochemical impedance, cyclic voltammetry and chronoamperometry. The shape of complex impedance plots depends on temperature and cathodic polarisation of the electrode. Nyquist (Z′′, Z′-) plots were fitted by equivalent circuit taking into account the electrolyte properties (at very high frequencies), charge transfer process at grain boundaries (at high frequencies), and medium and low frequency O2 reduction process at the cathode surface and inside the porous cathode material. Two different time constants have been obtained for the cathode process, i.e. for electroreduction of oxygen. It was found that the addition of CGO into the cathode material (LSCO) only somewhat decreases the surface catalytic activity but the noticeably higher low-frequency resistance (i.e. mainly diffusion-like mass transfer resistance RD) values at lower temperatures have been calculated. It was found that the mainly bulk diffusion-limited process at T≤773 K deviates toward the kinetically mixed process (diffusion + charge transfer) with increasing temperature.

Keywords

Solid oxide fuel cell Ce0.8Gd0.2O1.9 Mixed cathode La0.6Sr0.4CoO3-δ + Ce0.8Gd0.2O1.9 

Notes

Acknowledgements

This project is supported by AS Elcogen under the grants LFKFE01081 and LFKFE03006.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Enn Lust
    • 1
  • Gunnar Nurk
    • 1
  • Silvar Kallip
    • 1
  • Indrek Kivi
    • 1
  • Priit Möller
    • 1
  1. 1.Institute of Physical ChemistryUniversity of TartuTartuEstonia

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