Application of x-ray tomography to optimization of new NOx/NH3 mixed potential sensors for vehicle on-board emissions control

Conference · Thu Jan 01 04:00:00 EST 2009

DOI:https://doi.org/10.1149/1.3118562· OSTI ID:956555

Nelson, Mark A ^[1]; Brosha, Eric L ^[1]; Mukundan, Rangachary ^[1]; Garzon, Fernando H ^[1]

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1. Los Alamos National Laboratory

Mixed potential sensors for the detection of hydrocarbons, NO{sub x}, and NH{sub 3} have been previously developed at Los Alamos National Laboratory (LANL). The LANL sensors have a unique design incorporating dense ceramic-pelletlmetal-wire electrodes and porous electrolytes. The performance of current-biased sensors using an yttria-stabilized zirconia (YSZ) electrolyte and platinum and La{sub 0.8}Sr{sub 0.2}CrO{sub 3} electrodes is reported. X-ray tomography has been applied to non-destructively examine internal structures of these sensors. NO{sub x} and hydrocarbon response of the sensors under various bias conditions is reported, and very little NO{sub x} response hysteresis was observed. The application of a 0.6 {mu}A bias to these sensors shifts the response from a hydrocarbon response to a NO{sub x} response equal for both NO and NO{sub 2} species at approximately 500 {sup o}C in air.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 956555
• Report Number(s): LA-UR-09-01159; LA-UR-09-1159
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
AMMONIA
CHROMIUM OXIDES
CONTROL
DESIGN
DETECTION
ELECTRODES
ELECTROLYTES
HYDROCARBONS
HYSTERESIS
LANL
LANTHANUM OXIDES
MEETINGS
NITROGEN OXIDES
OPTIMIZATION
PERFORMANCE
PLATINUM
SENSORS
STRONTIUM OXIDES
TOMOGRAPHY
VEHICLES
YTTRIUM OXIDES
ZIRCONIUM OXIDES