Ce incorporated pyrochlore Pr2Zr2O7 solid electrolytes for enhanced mild-temperature NO2 sensing. Issue 15 (15th October 2017)

• Record Type: Journal Article
• Authors: Zhong, Fulan; Shi, Lanqian; Zhao, Jiwu; Cai, Guohui; Zheng, Yong; Xiao, Yihong; Long, Jinlin
• Is Part Of: Ceramics international. Volume 43:Issue 15(2017)
• Page Start: 11799
• Page End: 11806
• Publication Date: 2017-10-15
• Subjects: NO2 sensor -- Pyrochlore-phase Pr2Zr2O7 -- Solid electrolyte -- Ce doping; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.06.019
• Languages: English
• ISSNs: 0272-8842

Abstract

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 A2 B2 O7 solid electrolyte, Pr2 Zr2−x Cex O7+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 Pr2 Zr1.9 Ce0.1 O7+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.