Planar non-nernstian electrochemical sensors: Field test in the exhaust of a spark ignition engine

Maria Luisa Grilli, Elisabetta Di Bartolomeo*, Alessandra Lunardi, Laure Chevallier, Stefano Cordiner, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Field measurements of NOx, HCs and CO concentrations on an engine test bench were performed on YSZ-based planar sensors. Sensors with two parallel Pt finger electrodes, one coated with WO3 thick film as sensing electrode, were fabricated. The planar sensor was positioned close to a commercial λ sensor, downstream the three-way catalytic converter of a FIAT fire 1242 cc spark ignition engine coupled to a dynamometer. The performance of the gas sensors was measured at the stoichiometric air/fuel ratio (A/F ∼ 14.3) and in lean (A/F ∼ 15) and rich (A/F ∼ 13) conditions under different engine regimes (rpm and torque). The response of gas sensors was compared to the response of the commercial λ probe and related to the exhaust gas concentrations measured by spectroscopic analytical equipment at the engine exhaust end. Preliminary measurements showed promising results in terms of selectivity, sensitivity, stability, reproducibility, and response time.

Original languageEnglish (US)
Pages (from-to)319-325
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number1-2 SPEC. ISS.
StatePublished - Jul 22 2005
Externally publishedYes


  • Automotive applications
  • Electrical properties
  • Electrochemical sensors
  • ZrO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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