Electrochemical NOx Sensors Based on Interfacing Nanosized LaFeO3 Perovskite-Type Oxide and Ionic Conductors

Marisa Luisa Grilli*, Elisabetta Di Bartolomeo, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

Electrochemical NOx sensors based on coupling different ionic conductors with perovskite-type LaFeO3 as auxiliary phase were prepared. The ionic conductors used were yttria-stabilized zirconia that is an oxygen ion conductor and sodium superionic conductor whose charge carriers are sodium ions. Thick films of LaFeO3 powders were deposited using a screen printing oil on one side of the solid electrolyte pellets, using powders having different grain sizes. 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. Quite stable emf values and fast response times were obtained. The NO2 response was much larger when powders with nanosized grains were used for the preparation of the electrodes. From polarization curves, all sensors showed a nonlinear behavior. The role played by the electrolyte/electrode interface was determined by electrochemical impedance spectroscopy measurements; exposure to NO2 did not affect the bulk but only the electrolyte/electrode interface.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume148
Issue number9
DOIs
StatePublished - Sep 1 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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