Electrode polarization and electrical properties of the La0.6Sr0.4Co0.8Fe0.2O3 − δ, O2/yttria stabilized zirconia interface: Effect of gas phase composition and temperature

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Tsiakaras, P. and Marnellos, G. and Athanasiou, C. and Stoukides, M. and Elshof ten, J.E. and Bouwmeester, H.J.M. and Verweij, H. (1996) Electrode polarization and electrical properties of the La0.6Sr0.4Co0.8Fe0.2O3 − δ, O2/yttria stabilized zirconia interface: Effect of gas phase composition and temperature. Solid State Ionics, 86-88 (2). pp. 1451-1456. ISSN 0167-2738

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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.
Item Type:Article
Copyright:© 1996 Elsevier Science
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/12184
Official URL:http://dx.doi.org/10.1016/0167-2738(96)00328-1
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