WANG Guang-wei1, LI He-ping1, XU Li-ping1, et al. Effects of metal/YSZ electrodes on characteristics of oxygen sensors[J]. 2009, 28(2): 26-29. DOI: 10.13873/j.1000-97872009.02.035.
金属/YSZ电极对氧传感器性能的影响
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
6
00℃时
O2在Ag/YSZ电极上反应速率最快
激活能最低
为91 kJ.mol-1;Pt/YSZ电极激活能最高
为183 kJ.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/YSZ电极高
Pd含量增大时
Ag-Pd/YSZ电极激活能亦增大;400
4
50℃时
Ag/YSZ氧传感器响应时间最短
450
6
00℃时
Ag-1%Pd/YSZ氧传感器响应最快。
Abstract
By means of SEM observation and complex AC impedance
the interfacial 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 O2 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
Keywords
references
氧化锆氧传感器中的银电极研究 [J]. 杨欣,汪波,夏风. 传感技术学报 . 2004(01)
O 2 ,金属电极/YSZ界面的电化学研究 [J]. 李奇,孙成文,王评初,杨芝洲. 无机材料学报 . 1998(03)
Ag–Zr(Sc)O 2 cermet cathode for reduced temperature SOFCs [J] . K. Sasaki,K. Hosoda,T.N. Lan,K. Yasumoto,S. Wang,M. Dokiya. Solid State Ionics . 2004 (1)
Investigation of the state of the electrochemically generated adsorbed O species on Au films interfaced with Y 2 O 3 -doped-ZrO 2 [J] . D. Tsiplakides,S. G. Neophytides,C. G. Vayenas. Ionics . 2001 (3)
Thermodynamic Stability and Interfacial Impedance of Solid-Electrolyte Cells with Noble-Metal Electrodes [J] . Victor Stancovski,Seetharaman Sridhar,Uday B. Pal. Journal of Electroceramics . 1999 (3)
Thermal desorption study of Oxygen adsorption on Pt, Ag & Au films deposited on YSZ [J] . D. Tsiplakides,S. Neophytides,C. G. Vayenas. Ionics . 1997 (3)