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.
Tsiakaras, P., Marnellos, G., Athanasiou, C., Stoukides, M., ten Elshof, J. E., Bouwmeester, H. J. M., & Verweij, H. (1996). Electrode polarization and electrical properties of the La0.6Sr0.4Co0.8Fe0.2O3-(delta),/O2ytria stabilizes zirconia interface: effect of gas phase composition and temperature. Solid state ionics, 86-88(86-88), 1451-1456. https://doi.org/10.1016/0167-2738(96)00328-1