Potentiometric NOx sensor based on stabilized zirconia and NiCr2O4 sensing electrode operating at high temperatures |
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| Institution: | 1. Advanced Science and Technology Center for Cooperative Research, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan;2. R&D Division, Riken Corporation, Kumagaya-shi, Saitama 360-8522, Japan;3. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan;1. Fachgebiet Keramische Werkstoffe/ Chair of Advanced Ceramic Materials, Institut für Werkstoffwissenschaften und -technologien, Fakultät III, Technische Universität Berlin, Hardenbergstr. 40, 10623, Berlin, Germany;2. Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Valencia, Camino de Vera, Edificio 5F, 46022, Valencia, Spain;3. Fachgebiet Funktionsmaterialien, Institut für Chemie, Fakultät II, Technische Universität Berlin, Hardenbergstr. 40, 10623, Berlin, Germany;4. Bundesanstalt für Materialforschung und -prüfung (BAM), Division 6.5 – Polymers in Life Sciences and Nanotechnology, Unter den Eichen 87, 12205, Berlin, Germany;1. Department of Solid State Physics, Faculty of Basic Sciences, University of Mazandaran, 4741695447, Babolsar, Iran;2. Department of Electrical and Medical Engineering, Mazandaran University of Science and Technology, Babol, Iran;1. Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, 620137 Yekaterinburg, Russia;2. Ural Federal University, 620002 Yekaterinburg, Russia;3. Laboratory of Alternative Energy Conversion Systems, Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, 383 34 Volos, Greece;1. Faculty of Civil Engineering Technology, Universiti Malaysia Perlis, 02600, Arau, Perlis, Malaysia;2. Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis, 02600, Arau, Perlis, Malaysia;3. Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Skudai, Johor, Malaysia;1. College of Materials and Chemical Engineering, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China;2. Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University, China;1. Faculty of Civil Engineering Technology, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia;2. Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia;3. Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310 Skudai, Johor, Malaysia |
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| Abstract: | The two types of electrochemical sensors using stabilized zirconia and the oxide sensing electrode (SE) were developed for NOx detection at high temperatures. For the mixed-potential-type sensor, NiCr2O4 was found to give fairly excellent NOx sensing characteristics in air among several spinel-type oxides tested. This NOx sensor provided a linear correlation between EMF and the logarithm of NO or NO2 concentration in the range 25–436 ppm and in the temperature range 550–650°C. With fixed bias voltage being applied between the SE (oxide) and the counter (Pt) electrode (CE), the EMF between SE and the reference (Pt) electrode (RE) was measured as a sensing signal. The NiCr2O4-attached tubular device was found to provide selective response to NO over NO2 if SE was polarized at +175 mV versus RE. It was also found that this device gave selective response to NO2 over NO, if SE was polarized at ?250 mV versus CE. The new design of the planar device was proposed to avoid the cross-sensitivities to the others gases usually coexisting in car exhausts. |
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