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原文传递 Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust

题名：	Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust
作者：	Glass, R S;Pham, A Q;Martin, L P;
关键词：	99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; CARBON MONOXIDE; ELECTRODES; HYDROCARBONS; MONITORING; NITROGEN; OXIDES; POLLUTANTS; REGULATIONS; SENSITIVITY; SUBSTRATES; TESTING; VELOCITY
摘要：	New emissions regulations will increase the need for compact, inexpensive sensors for monitoring and control of automotive exhaust gas pollutants. Species of interest include hydrocarbons, carbon monoxide, and oxides of nitrogen (NO{sub x}). The current work is directed towards the development of fast, high sensitivity electrochemical NO{sub x} sensors for automotive diesel applications. We have investigated potentiometric NO sensors with good sensitivity and fast response when operated in 10%O{sub 2}. The sensors consist of yttria-stabilized zirconia substrates attached with NiCr{sub 2}O{sub 4} sensing electrodes and Pt reference electrodes. A composite NiCr{sub 2}O{sub 4}:Rh sensing electrode is shown to give significantly faster response than NiCr{sub 2}O{sub 4} alone. The exact role of the Rh in enhancing the response speed is not clear at present. However, the Rh appears to accumulate at the contacts between the NiCr{sub 2}O{sub 4} particles and may enhance the inter-particle electronic conduction. Ongoing testing of these sensors is being performed to elucidate the sensing mechanisms and to quantify cross sensitivity to, for example, NO{sub 2}.
报告类型：	科技报告