Non-Nernstian planar sensors based on YSZ with a Nb2O5 electrode

Laure Chevallier; Elisabetta Di Bartolomeo; Maria Luisa Grilli; Marina Mainas; Briggs White; Eric D. Wachsman; Enrico Traversa

doi:10.1016/j.snb.2007.09.037

Non-Nernstian planar sensors based on YSZ with a Nb₂O₅ electrode

Laure Chevallier^*, Elisabetta Di Bartolomeo, Maria Luisa Grilli, Marina Mainas, Briggs White, Eric D. Wachsman, Enrico Traversa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

The discussion about the sensing mechanism of non-Nernstian electrochemical gas sensors with a semiconducting sensing electrode is still open. This work reports a study of the influence of the metallic electrode under the semiconducting metal oxide, Nb₂O₅, on the sensor response. Planar sensors based on tape-cast YSZ layers were fabricated. Two Pt or Au finger electrodes were deposited on one side of the layers. One of the electrodes was covered with a Nb₂O₅ thick film. The response to CO was studied performing electromotive force (EMF) measurements in the 450-650 °C temperature range. In order to better understand the sensing mechanism, the electrical measurements were correlated to catalytic measurements performed on both electrodes. With no catalytic electrodes, the adsorption-Fermi level related mechanism seems to prevail, while in the case of sensors with Nb₂O₅|Pt|YSZ electrode, the mixed potential theory is more adapted to explain the results.

Original language	English (US)
Pages (from-to)	591-598
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	129
Issue number	2
DOIs	https://doi.org/10.1016/j.snb.2007.09.037
State	Published - Feb 22 2008
Externally published	Yes

Keywords

Metallic electrode
NbO sensing electrode
TPR analysis
YSZ-based gas sensors

ASJC Scopus subject areas

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

Access to Document

10.1016/j.snb.2007.09.037

Cite this

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title = "Non-Nernstian planar sensors based on YSZ with a Nb2O5 electrode",

abstract = "The discussion about the sensing mechanism of non-Nernstian electrochemical gas sensors with a semiconducting sensing electrode is still open. This work reports a study of the influence of the metallic electrode under the semiconducting metal oxide, Nb2O5, on the sensor response. Planar sensors based on tape-cast YSZ layers were fabricated. Two Pt or Au finger electrodes were deposited on one side of the layers. One of the electrodes was covered with a Nb2O5 thick film. The response to CO was studied performing electromotive force (EMF) measurements in the 450-650 °C temperature range. In order to better understand the sensing mechanism, the electrical measurements were correlated to catalytic measurements performed on both electrodes. With no catalytic electrodes, the adsorption-Fermi level related mechanism seems to prevail, while in the case of sensors with Nb2O5|Pt|YSZ electrode, the mixed potential theory is more adapted to explain the results.",

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AU - Chevallier, Laure

AU - Di Bartolomeo, Elisabetta

AU - Grilli, Maria Luisa

AU - Mainas, Marina

AU - White, Briggs

AU - Wachsman, Eric D.

AU - Traversa, Enrico

PY - 2008/2/22

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N2 - The discussion about the sensing mechanism of non-Nernstian electrochemical gas sensors with a semiconducting sensing electrode is still open. This work reports a study of the influence of the metallic electrode under the semiconducting metal oxide, Nb2O5, on the sensor response. Planar sensors based on tape-cast YSZ layers were fabricated. Two Pt or Au finger electrodes were deposited on one side of the layers. One of the electrodes was covered with a Nb2O5 thick film. The response to CO was studied performing electromotive force (EMF) measurements in the 450-650 °C temperature range. In order to better understand the sensing mechanism, the electrical measurements were correlated to catalytic measurements performed on both electrodes. With no catalytic electrodes, the adsorption-Fermi level related mechanism seems to prevail, while in the case of sensors with Nb2O5|Pt|YSZ electrode, the mixed potential theory is more adapted to explain the results.

AB - The discussion about the sensing mechanism of non-Nernstian electrochemical gas sensors with a semiconducting sensing electrode is still open. This work reports a study of the influence of the metallic electrode under the semiconducting metal oxide, Nb2O5, on the sensor response. Planar sensors based on tape-cast YSZ layers were fabricated. Two Pt or Au finger electrodes were deposited on one side of the layers. One of the electrodes was covered with a Nb2O5 thick film. The response to CO was studied performing electromotive force (EMF) measurements in the 450-650 °C temperature range. In order to better understand the sensing mechanism, the electrical measurements were correlated to catalytic measurements performed on both electrodes. With no catalytic electrodes, the adsorption-Fermi level related mechanism seems to prevail, while in the case of sensors with Nb2O5|Pt|YSZ electrode, the mixed potential theory is more adapted to explain the results.

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