The Sensing Mechanism Study of Potentiometric NO2 Sensor Based on Varying WO3 Electrode Thickness

7th Annual International Conference on Materials Science and Engineering

Yang, Bin^1 ; Huang, Chuqi^1 ; Yu, Hanyu^1 ; Xu, Jinlong^1 ; Wang, Jingxin^1 ; Xia, Feng^1 ; Wang, Chao^1 ; Xiao, Jianzhong^1

State Key Laboratory of Materials Processing and Die and Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan

430074, China^1

关键词: Adsorption site;    Catalytic decomposition;    Electrode thickness;    Linear relationships;    Sensing electrode;    Sensing mechanism;    Sensing performance;    Voltage response;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012010/pdf
DOI  :  10.1088/1757-899X/562/1/012010

来源: IOP

【 摘 要 】

In order to understand the NO2 sensing mechanism, YSZ-based (Y2O3-doped ZrO2 electrolyte) potentiometric sensors with varying WO3 sensing electrode thickness were investigated. The NO2 sensing performances were evaluated at 500 °C, 550 °C and 600 °C. All sensors showed linear relationships between voltage response and NO2 concentration. The sensor with moderate WO3-SE thickness (34.9 μm) exhibited higher sensitivity than any other sensors with thinner or thicker WO3-SE. This behavior was attributed to different gas adsorption sites and a different degree of catalytic decomposition of NO2 to NO occurring at the WO3 (Pt)/YSZ interface.