金属/YSZ电极对氧传感器性能的影响  

Effects of metal/YSZ electrodes on characteristics of oxygen sensors

作　　者：王光伟[1,2] 李和平[1] 徐丽萍[1] 张磊[1,2] 单双明[1] 汪日平[1,2] 

机构地区：[1]中国科学院地球化学研究所,贵州贵阳550002 [2]中国科学院研究生院,北京100039

出　　处：《传感器与微系统》2009年第2期26-29,共4页Transducer and Microsystem Technologies

基　　金：国家"863"计划资助项目(2006AA09Z205);国家自然科学基金资助项目(40573046);中国科学院重大科研装备研制项目(YZ200720)

摘　　要：借助交流阻抗谱测试技术和扫描电镜，对Pt，Au，Ag，Ag—Pt，Ag—Pd电极浆料所制金属／YSZ电极的界面电阻、激活能进行了研究，并计算了由其构成的氧传感器达到90％响应量所需时间。研究表明：400-600℃时，02在Ag／YSZ电极上反应速率最快，激活能最低，为91kJ·mol^-1；Pt／YSZ电极激活能最高，为183kJ·mol^-1，电极反应速率控制步骤为吸附氧原子在电极表面的扩散过程；Ag—Pt，Ag—Pd／YSZ电极激活能均较Ag／vsz电极高，Pd含量增大时，Ag—Pd／YSZ电极激活能亦增大；400-450℃时，Ag／YSZ氧传感器响应时间最短，450-600℃时，Ag-1％Pd／YSZ氧传感器响应最快。By means of SEM observation and complex AC impedance, the interfarial resistance and activation energy of M/YSZ electrodes （M =Pt,Au,Ag, Ag-Pt, Ag-Pd） are investigated,and the 90 % response time of oxygen sensors made up of these electrodes are calculated. The study indicates that at 400 - 600℃, the Ag,/YSZ electrode has the fastest 02 reaction rate and the lowest activation energy of 91 kJ . mol^-1 ; Pt/YSZ electrode has the highest activation energy of 183 kJ . mol^-1, rate determining step （ RDS ） of the electrode reaction is the diffusion of adsorbed oxygen atoms on the Pt surface towards the YSZ; each of the Ag-Pt/YSZ and Ag-Pd/YSZ electrodes has higher activation energy than the Ag/YSZ electrode, and the activation energy of Ag-Pd/YSZ electrode increases as the content of Pd increased ; Ag,/YSZ oxygen sensor has the shortest response time at 400 - 450 ℃ ,but during 450 -600 ℃ ,it is Ag-1% Pd/YSZ oxygen sensor that has the fastest response rate.

关 键 词：金属/YSZ电极 阻抗谱 界面电阻 激活能 响应时间 

分 类 号：TQ174[化学工程—陶瓷工业]