Development of a NOx gas sensor for exhaust
نویسندگان
چکیده
A high-sensitive sensor for NOx detection based on selective electrochemical reduction of NO2 is proposed. Electrochemical cell consisting of three metallic electrodes and YSZ electrolyte operates under electric polarization and allows selective NO2 detection in exhaust gases at 400-550°C. Electrical polarization applied between working and counter electrodes accelerates partial electrochemical reaction: oxygen reduction on cathode and oxygen-ion oxidation on anode. Variation of working electrode potential, where NO2 reduction is possible, is proportional to NO2 concentration. Cross-sensitivity of sensor to hydrocarbons, NO and CO was not observed. Combination with a catalytic filter allows NO measurement and distinction between NO and NO2, given that oxygen concentration is known and ammonia concentration remains negligible.
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