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Journal of Solid State Electrochemistry

, Volume 20, Issue 6, pp 1633–1643 | Cite as

Electrochemical response of several cathode configurations prepared with Ba0.5Sr0.5Co0.8Fe0.2O3-δ and Ce0.9Gd0.1O1.95 for IT-SOFC

  • Cristian Setevich
  • Fernando Prado
  • Alberto Caneiro
Original Paper

Abstract

The electrochemical response of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) electrodes prepared by an acetic acid-based gel route has been investigated by impedance spectroscopy (IS) as a function of temperature (400 ≤ T ≤ 900 °C) and oxygen partial pressure (1 × 10−3 ≤ pO2 ≤ 1 atm). Several electrode configurations were studied using Ce0.9Gd0.1O1.95 (GDC) as the electrolyte. These consisted of one BSCF layer (cell A), a BSCF layer with an intermediate porous GDC layer (cell B), and graded electrodes using a composite BSCF+GDC, with variations in the surface area of GDC (cells C and D). The optimum heat treatment for the electrode assemblages was determined to be around 850–900 °C. Analysis of the impedance spectra shows that at T ≥ 600 °C a low frequency (LF) contribution, associated to the gas phase diffusion is systematically the rate-limiting step. All the electrodes show an intermediate frequency (IF) arc related to mixed processes. For cells A and B, the IF response is related to the oxide ion transfer at the electrode/electrolyte surface and the charge transfer at the electrode surface, while for cells C and D the mixed process involves the charge transfer and the molecular oxygen dissociation at the electrode surface.

Keywords

BSCF Impedance spectroscopy Cathode SOFC 

Notes

Acknowledgments

The authors thank L. Toscani for specific area measurements and A. Prado for English revision of the manuscript. This work was supported by Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Agencia Nacional de Promoción Científica y Técnica (ANPCyT), Argentina, through PIP 112 2013 0100151 CO, PICT 2010-0322, and PICT 2013-1032, respectively.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Cristian Setevich
    • 1
    • 2
  • Fernando Prado
    • 1
  • Alberto Caneiro
    • 2
  1. 1.Departamento de FísicaUniversidad Nacional del Sur and Instituto de Física del Sur, CONICETBahía BlancaArgentina
  2. 2.Centro Atómico Bariloche, Comisión Nacional de Energía AtómicaS. C. de BarilocheArgentina

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