高温烧制时间对Pt/YSZ电极性能的影响  

Effects of sintering time on characteristics of Pt/YSZ electrode

作　　者：王光伟[1,2] 李和平[1] 徐丽萍[1] 张磊[1,2] 张艳清[1,2] 窦静[1,2] 

机构地区：[1]中国科学院地球化学研究所地球深部物质与流体作用实验室,贵州贵阳550002 [2]中国科学院研究生院,北京100039

出　　处：《中南大学学报（自然科学版）》2010年第6期2115-2121,共7页Journal of Central South University:Science and Technology

基　　金：国家高技术研究发展计划("863"计划)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：借助交流阻抗测试技术以及循环伏安、计时电流和扫描电镜方法,研究用Pt浆法制备Pt/YSZ电极过程中高温（850℃）烧制时间对其性能的影响。研究结果表明：在Pt/YSZ电极制作时,随着高温烧制时间的增加,电极界面阻抗和氧传感器响应时间均先减小后增大,当烧制时间为10 h时,电极阻抗最小,响应最快,活性最强;Pt/YSZ电极反应激活能受高温烧制时间的影响较小,为200~220 kJ/mol,其速率控制步骤可能为气相O2在PtOx/YSZ界面伴随电荷转移的解离过程。By means of complex AC impedance,cyclic voltammetry,chronoamperometry and SEM observation,the effects of the Pt/YSZ electrode sintering time at 850 ℃ during the preparing process with the platinum paste method on the characteristics of the electrode were studied.The results show that when the sintering time of the Pt/YSZ electrodes increase,both the interfacial resistances of the electrodes and the response time of the oxygen sensors decrease at first and then increase,the electrode sintered for 10 h has the least resistance,quickest response and best electrode activity;the activation energies of the electrode reactions on the Pt/YSZ electrodes are 200-220 kJ/mol,hardly affected by the sintering time,and the rate determining step（RDS） of the O2/O2- electrode reaction is supposed to be the dissociation of O2 involving a charge-transfer on Pt oxide/YSZ interface.

关 键 词：Pt/YSZ电极 烧制时间 阻抗谱 循环伏安 计时电流法 

分 类 号：TQ174[化学工程—陶瓷工业]