Solid electrolyte gas sensors based on cyclic voltammetry with one active electrode

Solid state gas sensors are cost effective, small, rugged and reliable. Typically electrochemical solid state sensors operate in either potentiometric or amperometric mode. However, a lack of selectivity is sometimes a shortcoming of such sensors. It seems that improvements of selectivity can be obt...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011-10, Vol.18 (21), p.212007-4
Main Authors: Jasinski, G, Jasinski, P
Format: Article
Language:English
Subjects:
Acceleration
Chemical reactions
Chemical sensors
Electric potential
Electrical measurement
Electrodes
Gas sensors
Nitrogen dioxide
Ramps
Regeneration
Selectivity
Sensors
Solid electrolytes
Solid state
Voltage
Voltammetry
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Summary:Solid state gas sensors are cost effective, small, rugged and reliable. Typically electrochemical solid state sensors operate in either potentiometric or amperometric mode. However, a lack of selectivity is sometimes a shortcoming of such sensors. It seems that improvements of selectivity can be obtained in case of the electrocatalytic sensors, which operate in cyclic voltammetry mode. Their working principle is based on acquisition of an electric current, while voltage ramp is applied to the sensor. The current-voltage response depends in a unique way on the type and concentration of ambient gas. Most electrocatalytic sensors have symmetrical structure. They are in a form of pellets with two electrodes placed on their opposite sides. Electrochemical reactions occur simultaneously on both electrodes. In this paper results for sensors with only one active electrode exposed to ambient gas are presented. The other electrode was isolated from ambient gas with dielectric sealing. This sensor construction allows application of advanced measuring procedures, which permit sensor regeneration acceleration. Experiments were conducted on Nasicon sensors. Properties of two sensors, one with one active electrode and second with symmetrical structure, used for the detection of mixtures of NO2 and synthetic air are compared.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/21/212007