The electrocatalytic performance of the impregnated La0.6Sr0.4Co0.2Fe0.8O3-delta-Y2O3 stabilized ZrO2 (YSZ) cathodes has been investigated by electrochemical impedance spectroscopy (EIS) using a "three-electrode" configuration for intermediate temperature solid oxide fuel cells. The significant inductive loop observed in the fourth quadrant was related to two factors, one is the amount of LSCF loading, the other is the testing temperatures. The inductive loop in the impedance spectra disappeared under dc bias or low oxygen partial pressure. Based on this, the inductive loop in the impedance spectra is closely related to the excess oxygen adsorbed on the surface of electrode can be concluded.