Potentiometric NO2 Sensors Based on Thin Stabilized Zirconia Electrolytes and Asymmetric (La0.8Sr0.2)0.95MnO3 Electrodes

Sensors

Jie Zou²  Yangong Zheng²  Junliang Li¹  Zhongliang Zhan¹  Jiawen Jian² 

[1] CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), Shanghai 200050, China; E-Mail:;Gas Sensors & Sensing Technology Laboratory, College of Information Science and Engineering, Ningbo University, Ningbo 315211, China; E-Mails:

关键词: NO₂;    sensors;    lanthanum strontium manganite;    yttria-stabilized zirconia;    gas-phase reaction;   

DOI  :  10.3390/s150717558

来源: mdpi

【 摘 要 】

Here we report on a new architecture for potentiometric NO₂ sensors that features thin 8YSZ electrolytes sandwiched between two porous (La_0.8Sr_0.2)_0.95MnO₃ (LSM95) layers—one thick and the other thin—fabricated by the tape casting and co-firing techniques. Measurements of their sensing characteristics show that reducing the porosity of the supporting LSM95 reference electrodes can increase the response voltages. In the meanwhile, thin LSM95 layers perform better than Pt as the sensing electrode since the former can provide higher response voltages and better linear relationship between the sensitivities and the NO₂ concentrations over 40–1000 ppm. The best linear coefficient can be as high as 0.99 with a sensitivity value of 52 mV/decade as obtained at 500 °C. Analysis of the sensing mechanism suggests that the gas phase reactions within the porous LSM95 layers are critically important in determining the response voltages.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.