Electrode Properties of Sr‐Doped LaMnO3 on Yttria‐Stabilized Zirconia: II. Electrode Kinetics

A series of six cathodes (SLM) on yttria‐stabilized zirconia with different morphology of the electrode/electrolyte interface were characterized by ac impedance and dc polarization measurements. It is found that the electrode kinetics at elevated temperature (945°C) are governed by two serial processes. An activation process can be identified to occur at high cathodic overpotential, whereas a transport process competes with charge‐transfer at comparatively low overpotential. Attention is drawn to the profound change in the electrocatalytic properties of upon current passage and its influence in elucidation of the interfacial kinetics.