用交流阻抗技术研究了二电极、三电极Ｐｔ／钇稳定氧化锆（简称ＹＳＺ）高温固体电化学体系．开路电位下，Ｐｔ／ＹＳＺ体系只有一个阻抗半圆，对应于电极体系的电化学活化控制过程，极化电阻随温度变化的表观活化能为１７１．５ｋＪ／ｍｏｌ．Ｐｔ／ＹＳＺ界面的双电层电容约为３００μＦ／ｃｍ２．阳极极化下，交流阻抗极化电阻显著减小；阴极极化下，极化电阻反而增大，并出现浓差控制现象． The high-temperature solid-state electrochemical system of two-electrode, three-electrode Pt / yttrium stabilized zirconia (YSZ) was studied by using AC impedance technique. The open circuit potential, Pt / YSZ system has only one impedance semicircle, corresponding to the electrochemical activation of the electrode system control process, the apparent activation energy of the polarization resistance with temperature changes of 171.5kJ / mol. The electric double layer capacitance of Pt / YSZ interface is about 300μF / cm2. Under anodic polarization, the polarization resistance of AC impedance decreases significantly. Under cathodic polarization, the polarization resistance increases, and the concentration control phenomenon appears.