Electrode polarization and electrical properties of the La 0.6Sr 0.4Co 0.8Fe 0.2O 3 − δ, O 2/yttria stabilized zirconia interface: Effect of gas phase composition and temperature

Abstract

The steady-state current-overpotential characteristics of the O 2,La 0.6Sr 0.4Co 0.8Fe 0.2O 3 − 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: α a = α c = 1. The logarithm of the equilibrium exchange current density ( I 0) 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 (O ads −) on the oxide surface is assumed to be the rate determining step of the electrode reaction.