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Title: Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust

Abstract

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}.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15003123
Report Number(s):
UCRL-JC-151096
TRN: US200420%%362
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Materials Research Society Fall Meeting, Boston, MA (US), 12/02/2002--12/06/2002; Other Information: PBD: 25 Nov 2002
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; CARBON MONOXIDE; ELECTRODES; HYDROCARBONS; MONITORING; NITROGEN; OXIDES; POLLUTANTS; REGULATIONS; SENSITIVITY; SUBSTRATES; TESTING; VELOCITY

Citation Formats

Martin, L P, Pham, A Q, and Glass, R S. Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust. United States: N. p., 2002. Web.
Martin, L P, Pham, A Q, & Glass, R S. Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust. United States.
Martin, L P, Pham, A Q, and Glass, R S. 2002. "Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust". United States. https://www.osti.gov/servlets/purl/15003123.
@article{osti_15003123,
title = {Electrochemical NO{sub x} Sensors for Automotive Diesel Exhaust},
author = {Martin, L P and Pham, A Q and Glass, R S},
abstractNote = {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}.},
doi = {},
url = {https://www.osti.gov/biblio/15003123}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {11}
}

Conference:
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