金属／YSZ多晶陶瓷电极交流阻抗特性

AC Impedance Characteristics of Metal/YSZ Polycrystalline Ceramic Electrodes

本文测量了以Ｙ２Ｏ３稳定的ＺｒＯ２（ＹＳＺ）电池：Ａｉｒ，Ｍ（ｐｔ、Ａｕ、Ｐｄ－Ａｇ）｜ＹＳＺ）｜Ｍ（ｐｔ、Ａｕ、Ｐｄ－Ａｇ），Ａｉｒ在２５０～５００°Ｃ、１２Ｈｚ～１００ＫＨｚ之间的交流阻抗．从作出阻抗谱分析，计算了ＹＳＺ多品陶瓷的晶内、晶界电阻及其对温度的依从性．晶界阻抗半圆的特征频率和温度的关系同样服从于Ａｒｒｈｅｎｉｕｓ公式．比较了Ｐｔ、Ａｕ和Ｐｄ－Ａｇ电极在ＹＳＺ氧化物电解质上的极化特性，并对氧通过各个电极扩散的电极过程中氧浓度－扩散率的积ＣＯ作了计算．

The a.c. impedance spectroscopy was measured for the yttria stabilized zirconia (YSZ) chide solid electrolyte cell: PO.(air), Metal(Pt, Pd-Ag, Au) YSZ|Metal (Pt, Pd-Ag, An), Po2(air) in the temperature range 250～500°C and frequency range 0.012～10kHz. The resistance, capacitance of bulk and grain boundary for (Y2O3)0.07(ZrO2)0.93 polycrystalline ceramic were analysed and the dependance of resistance on temperature was calculated in terms of complex impedance plots. The relationship of the charaCteristic frequency ic at the maximum of the semi-circle in grain bounary and temperature can be expressed by Arrhenius formula. The polarised characteristics of the electrodes of Pt, An and Pd-Ag on yttria stabilized zircoula interfaCe were compared. The evaluation of the concentration- (diffusivity)1/2 product, (CoDo),for the oxygen in each metal electrode process were made.