Sensing mechanism of potentiometric gas sensors based on stabilized zirconia with oxide electrodes - Is it always mixed potential?

Elisabetta Di Bartolomeo*, Maria Luisa Grilli, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

The non-Nernstian behavior of zirconia-based electrochemical NCx and CO sensors with various semiconducting oxides as sensing electrodes was extensively studied in the temperature range 450-700°C. Both pellets and tape-cast layers of yttria-stabilized zirconia were used for the fabrication of the sensors. It was found that the gas-sensing mechanism of the sensors cannot be explained always by the mixed potential theory. When semiconducting oxides are used as sensing electrodes, the semiconductor sensing mechanism and the adsorption-desorption behavior of the different oxides dominate the sensor response if both metal and oxide are exposed to the same environment.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume151
Issue number5
DOIs
StatePublished - Jun 22 2004

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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