SE.3 - Highly selective and stable mixed-potential type gas sensor based on stabilized zirconia and Cd2V2O7 sensing electrode for NH3 detection
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- Solid Electrolyte Sensors
- Author(s)
- F. Liu, J. Wang, G. Lu - State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun (China)
- Pages
- 399 - 399
- DOI
- 10.5162/IMCS2018/SE.3
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Among engine aftertreatment systems, selective catalytic reduction (SCR) that uses urea as reducing agent has been recognized as the most promising technology to eliminate the NOx emissions from diesel vehicles. In this system, a urea solution is injected into an exhaust line to react with the NOx from combustion exhaust. To accurately control the amount of urea injected and to avoid NH3 slips that aggravate air pollution problems, a powerful NH3 gas sensor for on-board diagnosis (OBD) as closed-loop feedback control system must be employed. In this study, we investigate a new Cd2V2O7 composite oxide material as SE for YSZ-based mixed-potential-type sensor, which can be used to detect NH3 at elevated temperatures. The response for the sensor attached with Cd2V2O7–SE to 100 ppm of NH3 was approximately –67mV. The response time of the fabricated sensor to 100ppm NH3 was 5s, which exhibited the fast response rate. Moreover, ΔV almost varied linearly with the logarithm of NH3 concentration in the range of 10–200 ppm, which the sensitivity was –66 mV/decade. In addition, the detailed sensing characteristics and sensing mechanism of this sensor were identified and discussed.