Electrochemical NOx sensors for emission control of automotive exhaust gas were prepared coupling pellets of yttria-stabilized zirconia (YSZ), an oxygen ion conductor, with thick films of a semiconducting oxide (WO3) as an auxiliary phase. The obtained sensors were wholly exposed to the same atmosphere. Electromotive Force (EMF), polarization curves and amperometric measurements were performed in air and at different concentrations of NO2 in air, at selected temperatures. Stable EMF values and fast response times were obtained. The sensors showed non-linear polarization curves. The role played by the electrolyte/electrode interface was determined by electrochemical impedance spectroscopy (EIS) tests: exposure to NO2 did not affect the bulk but only the electrolyte/electrode interface. Further studies are needed, however, to better understand the sensing mechanisms of these devices, and to confirm the stability and selectivity in the presence of other exhaust gases, like hydrocarbons, CO or sulphur compounds.
Electrochemical NO(x) sensors for emission control of automotive exhaust gas
Elektrochemische NO(x)-Sensoren für die Regelung der Abgasemissionen von Kraftfahrzeugen
2001
5 Seiten, 5 Bilder, 24 Quellen
Conference paper
English
Electrochemical NOx Sensors for Emission Control of Automotive Exhaust Gas
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