High-Temperature Stable NOx Sensor for Exhaust Gas Monitoring in Automobiles
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Ceramic solid-state electrolytic sensors using electrochemical methods are the most suitable for manufacturing NOx sensors that canoperate reliably over a long period of time in high temperature and corrosive environment of exhaust gases. Unlike other oxides, nitrogencompounds are covalently bonded, and there is no separate conductor for nitrogen ions; therefore, it is not possible to produce sensorsbased on simple electromotive force measurements. Hence, electrochemical Type III electromotive force measurement, amperometrictype, electrical resistance type using oxide semiconductors, and mixed potential-type sensors can be used to measure NOx. However,Type III electromotive force measurement method is limited in that the melting point of the auxiliary electrode for NOx detection islower than the exhaust gas temperature at which the sensor must be driven. The amperometric sensor is not feasible because the electricalsignal obtained from the sensor is too weak to discriminate it from other signals, and the oxide electrode is subject to degradation. Therefore, this research aims to develop a solid electrolyte and sensing electrode material that can obtain a high detection signal for NOxgas even at temperatures above 800o C using a highly sensitive mixed potential method that solves these problems, and develop an algorithmand automotive NOx sensor that can stably detect NO and NO2 gas concentrations simultaneously.
Abstract
Ceramic solid-state electrolytic sensors using electrochemical methods are the most suitable for manufacturing NOx sensors that canoperate reliably over a long period of time in high temperature and corrosive environment of exhaust gases. Unlike other oxides, nitrogencompounds are covalently bonded, and there is no separate conductor for nitrogen ions; therefore, it is not possible to produce sensorsbased on simple electromotive force measurements. Hence, electrochemical Type III electromotive force measurement, amperometrictype, electrical resistance type using oxide semiconductors, and mixed potential-type sensors can be used to measure NOx. However,Type III electromotive force measurement method is limited in that the melting point of the auxiliary electrode for NOx detection islower than the exhaust gas temperature at which the sensor must be driven. The amperometric sensor is not feasible because the electricalsignal obtained from the sensor is too weak to discriminate it from other signals, and the oxide electrode is subject to degradation. Therefore, this research aims to develop a solid electrolyte and sensing electrode material that can obtain a high detection signal for NOxgas even at temperatures above 800o C using a highly sensitive mixed potential method that solves these problems, and develop an algorithmand automotive NOx sensor that can stably detect NO and NO2 gas concentrations simultaneously.
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