Electrode polarization and electrical properties of the La0.6Sr0.4Co0.8Fe0.2O3-(delta),/O2ytria stabilizes zirconia interface: effect of gas phase composition and temperature

P. Tsiakaras, G. Marnellos, C. Athanasiou, M. Stoukides, Johan E. ten Elshof, Henricus J.M. Bouwmeester, H. Verweij

Research output: Contribution to journalArticleAcademicpeer-review

16 Citations (Scopus)
43 Downloads (Pure)

Abstract

The steady-state current-overpotential characteristics of the O2,La0.6Sr0.4Co0.8Fe0.2O3 − δ/YSZ interface have been studied as a function of oxygen partial pressure and temperature. Ideal Nernst behaviour is observed in the temperature range between 400–900 °C and oxygen pressure range between 0.5–100 kPa. The results of I − η measurements indicate that in the potential range 0.05–0.25 V, the apparent anodic and cathodic charge transfer coefficients are close to unity: a = c = 1. The logarithm of the equilibrium exchange current density (I0) shows a positive dependence on the logarithm of the oxygen partial pressure with a slope m = 0.25 ± 0.05. These observations are in agreement with a proposed reaction model in which the diffusion of singly ionized oxygen adatoms (Oads−) on the oxide surface is assumed to be the rate determining step of the electrode reaction.
Original languageUndefined
Pages (from-to)1451-1456
Number of pages6
JournalSolid state ionics
Volume86-88
Issue number86-88
DOIs
Publication statusPublished - 1996

Keywords

  • IR-12184
  • METIS-106536

Cite this