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Medium-Low-Temperature NO2 Sensor Based on YSZ Solid Electrolyte and Mesoporous WO3 Sensing Electrode for Detection of Vehicle Emissions
Nano ( IF 1.2 ) Pub Date : 2021-06-25 , DOI: 10.1142/s1793292021500831
Cheng Zhang 1 , Chuning Jiang 1 , Xiaohong Zheng 1 , Xin Hong 1
Affiliation  

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 30–500ppm of NO2 at 300C and 500C. However, commercial WO3 only operate well at 500C. 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.

中文翻译:

基于YSZ固体电解质和介孔WO3传感电极的汽车尾气检测中低温NO2传感器

以氧化钇稳定氧化锆(YSZ)为电解液,介孔WO 3为传感电极,制备混合电位型NO 2传感器,用于检测汽车尾气中的NO 2。采用硬模板法合成了直径为7 nm的介孔WO 3 。该传感器在检测 30-500NO 2在300 和500 下的ppm 。然而,商业WO 3仅在500℃下运行良好。与商业WO 3相比,介孔WO 3的响应更高,测试温度更低。XPS结合NO 2 -TPD解释了介孔WO 3在中低温下的高活性,并通过电化学阻抗谱验证了混合电动势的机理。此外,该传感器在存在干扰气体(如 NO、CO、CO 2和 NH 3 )时表现出高 NO 2选择性. 最重要的是,该传感器具有出色的重复性和稳定性。
更新日期:2021-06-25
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