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- Title
Medium-Low-Temperature NO<sub>2</sub> Sensor Based on YSZ Solid Electrolyte and Mesoporous WO<sub>3</sub> Sensing Electrode for Detection of Vehicle Emissions.
- Authors
Zhang, Cheng; Jiang, Chuning; Zheng, Xiaohong; Hong, Xin
- Abstract
A mixed potential-type NO2 sensor was fabricated using yttria-stabilized zirconia (YSZ) as the electrolyte and mesoporous WO3 as the sensing electrode for the detection of NO2 in vehicle exhausts. The mesoporous WO3 with a diameter of 7 nm was synthesized using the hard template method. The sensor showed excellent performance in the detection of 30–500 ppm of NO2 at 300∘C and 500∘C. However, commercial WO3 only operate well at 500∘C. The response of the mesoporous WO3 was higher and the test temperature was lower compared to that of commercial WO3. XPS combined with NO2-TPD was used to explain the high activity of mesoporous WO3 at medium-low temperature, and the mechanism of mixed electromotive force was verified by electrochemical impedance spectroscopy. Furthermore, the sensor exhibited high NO2 selectivity in the presence of interfering gases, such as NO, CO, CO2 and NH3. Most importantly, the sensor had excellent repeatability and stability. YSZ was used as the solid electrolyte and mesoporous WO3 as the sensitive electrode. It is found in the test that the best working temperature of the mesoporous WO3-based sensor is 300∘C and 500∘C, respectively. The different optimal temperatures provide conditions for the sensor to test hazardous gases in different environments.
- Subjects
SOLID electrolytes; ELECTROMOTIVE force; DETECTORS; ELECTRODES; LOW temperatures
- Publication
NANO, 2021, Vol 16, Issue 7, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292021500831