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Testing Planar Gas Sensors Based on Yttria-stabilized Zirconia with Oxide Electrodes in the Exhaust Gases of a Spark Ignition Engine

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Abstract:

Planar sensors based on tape-cast yttria-stabilized zirconia (YSZ) layers were tested for on-line detection of pollutants (NOx, HCs and CO) in an Internal Combustion Engine (ICE) exhaust gases. Sensors with two parallel Pt finger electrodes, one coated with an oxide (La0.8 Sr0.2 FeO3 or In2O3) thick film as sensing electrode, were fabricated. Sensors were located close to a commercial oxygen sensor, downstreamthe three-way catalytic converter of a FIAT fire 1242 c.c. spark ignition engine coupled to a dynamometer. Electromotive force (EMF) response of gas and oxygen sensors, both located downstreamthe catalytic converter, were recorded simultaneously. The EMF measurements were correlated with the exhaust gas concentrations measured by spectroscopic analytical equipment at the engine exhaust end.

Keywords: AUTOMOTIVE APPLICATIONS; EMF MEASUREMENTS; GAS SENSORS; YSZ

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/sl.2005.005

Publication date: January 1, 2005

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