DocumentCode :
854871
Title :
The influence of the electrode size on the electrical response of a potentiometric gas sensor to the action of oxygen
Author :
Guillet, Nicolas ; Lalauze, René ; Viricelle, Jean-Paul ; Pijolat, Christophe
Author_Institution :
Departement MICC, CNRS URA, St. Etienne, France
Volume :
2
Issue :
4
fYear :
2002
fDate :
8/1/2002 12:00:00 AM
Firstpage :
349
Lastpage :
353
Abstract :
As a part of our research on new gas sensors, an original potentiometric gas sensor was developed. This gas sensor is made of a solid electrolyte (beta alumina) associated with two different metallic electrodes (gold and platinum) located in the same gas mixture. Tests performed under oxygen pressure show that the potential difference read between the electrodes depends on the experimental conditions, oxygen pressure, and temperature, but also on the electrodes surface area ratio. Then, we studied the electrical responses of devices composed of electrodes of the same nature (gold or platinum) but of different size. These electrode size influences are analyzed in terms of different capacitive effects occurring at the electrode-solid electrolyte interface. If we consider that the adsorption of oxygen species is responsible for the electrostatic potential, the proposed model is able to account for the experimental results. It is then possible to explain and to better understand the importance of the electrodes on the electrical response of such a device.
Keywords :
adsorption; electrochemical electrodes; electrochemical sensors; gas sensors; O; adsorption of oxygen species; beta alumina; capacitive effects; electrical responses; electrochemical sensor; electrode size influences; electrode-solid electrolyte interface; electrodes surface area ratio; electrostatic potential; metallic electrodes; oxygen pressure; potential difference; potentiometric gas sensor; solid electrolyte; Electrodes; Electrostatics; Gas detectors; Gold; Performance evaluation; Platinum; Solids; Temperature dependence; Temperature sensors; Testing;
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2002.803746
Filename :
1044390
Link To Document :
بازگشت