Medium-Low-Temperature NO₂ Sensor Based on YSZ Solid Electrolyte and Mesoporous WO₃ Sensing Electrode for Detection of Vehicle Emissions

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[Formula: see text]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.

Effects of Calcination Temperature Induced High-sensitivity N,N-dimethylformamide Gas-Sensing Performances Over LaFeO3Nanoparticles

“…[1][2][3][4][5] The World Health Organization has declared that the accumulation of chemical pollutants in the environment is one of the most important causes of biological disease and death. [6][7][8][9][10] As one of the most common chemical pollutants, volatile organic compounds (VOCs) has attracted the attention of researchers. In order to monitor air quality effectively and reduce the negative impact of VOCs on human life, a device that can detect VOCs quickly in the air is very important.…”