Impedance-based total-NOx sensor using stabilized zirconia and ZnCr2O4 sensing electrode operating at high temperature |
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| Institution: | 1. UNESCO-Africa Chair in Nanoscience and Nanotechnology, College of Graduate Studies, University of South Africa, Theo Van Wyk Building 9-119, P. O Box 392, UNISA, 0003, South Africa;2. Nanosciences African Network, Material Research Department, iThemba Laboratory for Accelerator Based Science, P. O Box 722, Somerset West, 7129, South Africa;3. Life Science Building, Biotechnolgy Department, University of the Western Cape, Private Bag x17, Bellville 7535, South Africa;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. National Engineering Research Center for Coal-Based Synthesis, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;1. Faculty of Materials Engineering, Malek Ashtar University of Technology, Shahin Shahr, Isfahan, Iran;2. Young Researchers and Elite Club, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran;1. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea;2. Department of Chemical and Materials Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia |
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| Abstract: | We report here a new-type zirconia-based sensor that can detect total NOx content at high temperatures such as 700 °C. A closed-one-end yttria-stabilized zirconia (YSZ) tube was used as a base sensor material. An oxide sensing electrode (SE) and a Pt counter electrode (CE) were formed on the outer and inner surfaces of the YSZ tube, respectively. The complex impedance of the device using a ZnCr2O4-sensing electrode was measured with an impedance analyzer in the frequency and the temperature ranges 0.1 Hz–100 kHz and 600–700 °C, respectively. A large semicircular arc was observed in complex impedance plots (Cole–Cole plots) in the lower frequency range examined and it seemed to correspond to the electrolyte/electrode interface. The impedance value at 1 Hz of the present device was found to vary almost linearly with the concentration of NO (or NO2) from 50 to 400 ppm in the sample gas at 600–700 °C. Furthermore, it is noted that the sensitivity of NO is almost equal to that of NO2. This means that the present device can detect the total NOx at higher temperatures. |
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