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The method of impedancemetry is used to study electrochemical activity of platinum electrodes in contact with the solid electrolyte of YSZ (ZrO 2 +10 mol % Y 2 O 3 ). Electrodes are activated by small additives of pradeodymium oxide PrO x (0.1-0.3 mg/cm 2 ) by their impregnation by praseodymium nitrate solution with the further thermal treatment at 850°C and are studied in the cases when PrO x forms a film on the electrolyte and when no activator film is formed. The effect of the number of electrode activations on the electrochemical activity of platinum electrodes is studied.

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