The polarization resistance of a model platinum gauze electrode in contact with a single-crystal electrolyte of doped zirconium dioxide is studied by impedance spectroscopy. Geometric characteristics of metal/electrolyte contact (contact area, triple-phase boundary length) are easily determined. The electrode pretreatment affects results of measurements in identical conditions. Cathodic and anodic polarizations increases its activity. The partial polarization resistance of a low-frequency relaxation process (R2) alters jumpwise, which suggests that there exist an initial state and a state after a current treatment. During a prolonged storage, R2 alters with time and tends to regain the initial state. The polarization resistance of the initial electrode depends on the electrolyte orientation. No such dependence is observed for the current-treated electrode.