Pt/YSZ氧传感器的电极电阻和响应特性

无机材料学报

Pt/YSZ氧传感器的电极电阻和响应特性

孙成文; 李奇; 陈深; 杨芝洲

中国科学院上海硅酸盐研究所; 上海200050

收稿日期:1997-07-17 修回日期:1997-09-16 出版日期:1998-08-10 网络出版日期:1998-08-10

Electrode Resistance of Pt/YSZ Oxygen Sensor and Response Behaviour

SUN Cheng-Wen; LI Qi; CHEN Shen; YANG Zhi-Zhou

Shanghai Institute of Cerumics; Chinese Academy of Sciences Shanghai 200050 China

Received:1997-07-17 Revised:1997-09-16 Published:1998-08-10 Online:1998-08-10

摘要/Abstract

摘要： 应用两电极直流极化法测定了氧传感器在380～800℃中的Pt，空气／YSZ电极电阻，从交流低频阻抗测量外推法测得YSZ的体电阻，可以将YSZ的直流极化从电极的过电位中区分出来．Pt，空气｜（ZrO2）_0．93（Y₂O₃）_0．07｜空气，Pt，电池的直流极化1gI-η作图得出，电极电荷传递系数为2．YSZ体电阻、Pt，空气／YSZ电极电阻和电极交换电流对温度的Arrhenius图，在600℃和570℃附近存在着类似的活化能变化．测量表明；700℃时，氧传感器的测量响应时间≤2．5s．

关键词: Pt／YSZ电极电阻, 氧化锆氧传感器, 氧化钇稳定氧化锆, 氧离子固体电解质

Abstract: The Pt, air/YSZ electrode resistance was determined for oxygen sensor with dc polarization of two electrode in the temperature range of 380～800℃.
The (ZrO₂)_0.93(Y₂O₃)_0.07 bulk resistances were obtained from the extrapolation method by ac low frequency impedance measurement, and the electrolyte
dc polarization resistance can be separated from electrode overpotentials. Results show the η-I curves obey the Butler-Volmer equation, with charge transfer
coefficients of two for the Pt, air |YSZ| air, Pt cell. The temperature dependence of the YSZ bulk resistance and the Pt, air/YSZ electrode resistance is
similar and a change in the activation energy of resistance occurs near 600℃ and 570℃ respectively. The exchange current I₀ of electrode as a
funclion of temperature was also measured. At temperature above 700℃, response time of the oxygen sensor is less than 2.5s.

Key words: Pt/YSZ electrode resistance, ZrO₂ oxygen sensor, yttria stabilized zirconia, oxide solid electrolyte

中图分类号:

TN304

孙成文,李奇,陈深,杨芝洲. Pt/YSZ氧传感器的电极电阻和响应特性[J]. 无机材料学报.

SUN Cheng-Wen,LI Qi,CHEN Shen,YANG Zhi-Zhou. Electrode Resistance of Pt/YSZ Oxygen Sensor and Response Behaviour[J]. Journal of Inorganic Materials.