Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437465 | Ceramics International | 2017 | 8 Pages |
Abstract
NO2 sensor has attracted extensive attention due to its important application in environment monitor. Conventional NO2 sensors based on the yttria-stabilized zirconia (YSZ) electrolyte possess fast response, high sensitivity and good stability, whereas its ionic conductivity decreases significantly at low- and intermediate-temperature, limiting the practical application in motor vehicles. In this work, a pyrochlore-phase A2B2O7 solid electrolyte, Pr2Zr2âxCexO7+δ (PZC), was applied for the first time to construct the amperometric-type NO2 sensor. Ce incorporated significantly improved the sensing performance of the PZC NO2 sensor with NiO as the sensing electrode. The effect of Ce-doped concentration and operating temperature on the sensitivity, selectivity, stability, response and recovery characteristics were investigated in detail. The results showed that the optimal sensor based on the Pr2Zr1.9Ce0.1O7+δ substrate gave high sensitivity, excellent selectivity and quick response-recovery behavior to NO2 gas. The gas-sensing mechanism was also discussed. The PZC sensors are well established effective for sensing NO2 at mild-temperature working window of 500-700 °C, and thus exhibit the promising application in motor vehicles.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Fulan Zhong, Lanqian Shi, Jiwu Zhao, Guohui Cai, Yong Zheng, Yihong Xiao, Jinlin Long,