Dynamometer testing of planar mixed-potential sensors

Cortney R. Kreller, Praveen K. Sekhar, Vitaly Y. Prikhodko, Josh A. Pihl, Scott Curran, James E. Parks, Rangachary Mukundan, Fernando H. Garzon, Eric L. Brosha

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations

Abstract

Mixed-potential sensors for vehicle on-board emissions monitoring applications have been fabricated in an automotive planar sensor configuration using high temperature ceramic co-fire methods. The sensing element consists of dense Pt and LaSrCrO electrodes and a porous 3 mol% YSZ electrolyte. This sensor construct exhibits preferential selectivity to NOx (NO+NO2) when operated at a positive current bias. The performance of the planar sensors under engine-out conditions was recently evaluated at the Oak Ridge National Laboratory National Transportation Research Center on a GM 1.9L CIDI diesel engine. The sensor response qualitatively tracked transients in NOx measured via FTIR under transient engine operation. Additionally, quantitative correlation between sensor voltage response and total NOx concentration was obtained under steady-state engine speed and load while varying exhaust gas recirculation (EGR) levels.

Original languageEnglish
Pages (from-to)55-63
Number of pages9
JournalECS Transactions
Volume61
Issue number19
DOIs
StatePublished - 2014
EventSymposium on Sensors, Actuators, and Microsystems General Session (Chemical and Biological Sensors) - 225th ECS Meeting - Orlando, United States
Duration: May 11 2014May 15 2014

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