ZrO_2氧传感器电极保护层的模拟  

Modeling of the Electrode Protecting Coating on ZrO_2 Oxygen Sensor

作　　者：夏风[1] 肖建中[1] 罗志安[1] 冯江涛[1] 

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074

出　　处：《传感技术学报》2004年第2期303-305,共3页Chinese Journal of Sensors and Actuators

摘　　要：汽车尾气净化用ZrO2 气体氧传感器的外电极表面常有陶瓷多孔层 ,用含有一个扩散孔的致密陶瓷构件 (扩散障 )模拟该陶瓷多孔层。测量了带扩散障的ZrO2 气体氧传感器的伏安曲线 ,并对该伏安曲线进行解析和数学模拟。发现氧气在扩散孔中扩散受阻时引起了电极极化 ,其极化程度与直流电流大小、温度、扩散孔几何尺寸、氧气的浓度等有关。给出了相应的数学表达式 ,其模拟伏安曲线与实际测量结果能较好的吻合。A porous ceramic coating the electrode of zirconia oxygen sensor is commonly used to clean exhaust gas from cars. The coating is modeled as a kind of gas diffusion barrier with a small hole in a dense ceramic block. The V/I characteristics of the sensor with the diffusion barrier is measured, resolved and simulated. Slow diffusion of oxygen gas in the small hole results in electrode polarization. A mathematic model is proposed. The modeling V/I characteristics fit the realistic V/I characteristics very well.

关 键 词：氧传感器 ZrO2气体扩散 电极 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]