Electrochemical nox sensors for emission control of automotive exhaust gas

Maria Luisa Grilli, Narin Kaabbuathong, Atanu Dutta, Elisabetta Di Bartolomeo, Enrico Traversa*

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

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 (WO 3) 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.

Original languageEnglish (US)
DOIs
StatePublished - Dec 1 2001
EventAutomotive and Transportation Technology Congress and Exhibition - Barcelona, Spain
Duration: Oct 1 2001Oct 3 2001

Other

OtherAutomotive and Transportation Technology Congress and Exhibition
CountrySpain
CityBarcelona
Period10/1/0110/3/01

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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