Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 151, Issue 5, Pages H133-H139Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1695387
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The non- Nernstian behavior of zirconia- based electrochemical NOx and CO sensors with various semiconducting oxides as sensing electrodes was extensively studied in the temperature range 450-700degreesC. 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. (C) 2004 The Electrochemical Society.
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