Electrochemical nox sensors for emission control of automotive exhaust gas

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

doi:10.4271/2001-01-3281

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

Physical Sciences and Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

Electrochemical NO_x 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 language	English (US)
DOIs	https://doi.org/10.4271/2001-01-3281
State	Published - Dec 1 2001
Event	Automotive and Transportation Technology Congress and Exhibition - Barcelona, Spain Duration: Oct 1 2001 → Oct 3 2001

Other

Other	Automotive and Transportation Technology Congress and Exhibition
Country/Territory	Spain
City	Barcelona
Period	10/1/01 → 10/3/01

ASJC Scopus subject areas

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

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title = "Electrochemical nox sensors for emission control of automotive exhaust gas",

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.",

author = "Grilli, {Maria Luisa} and Narin Kaabbuathong and Atanu Dutta and {Di Bartolomeo}, Elisabetta and Enrico Traversa",

year = "2001",

month = dec,

day = "1",

doi = "10.4271/2001-01-3281",

language = "English (US)",

note = "Automotive and Transportation Technology Congress and Exhibition ; Conference date: 01-10-2001 Through 03-10-2001",

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T1 - Electrochemical nox sensors for emission control of automotive exhaust gas

AU - Grilli, Maria Luisa

AU - Kaabbuathong, Narin

AU - Dutta, Atanu

AU - Di Bartolomeo, Elisabetta

AU - Traversa, Enrico

PY - 2001/12/1

Y1 - 2001/12/1

N2 - 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.

AB - 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.

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U2 - 10.4271/2001-01-3281

DO - 10.4271/2001-01-3281

M3 - Paper

T2 - Automotive and Transportation Technology Congress and Exhibition

Y2 - 1 October 2001 through 3 October 2001

ER -

Electrochemical nox sensors for emission control of automotive exhaust gas

Abstract

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