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ETUDE ET REALISATION D'UN CAPTEUR POTENTIOMETRIQUE A DIOXYDE DE CARBONE EN CONFIGURATION OUVERTE

Abstract : Sensors based on NASICON functions out of differential between an electrode sensitive to O2 and another sensitive to CO2 and O2. The response does not depend any more of the oxygen partial pressure.
Each element of the sensor (reference electrode, solid electrolyte and sensing electrode) was separately studied with physical and electrical characterizations to select best materials.
Screen-printing method was retained among several electrode deposit to test the influence on the response of the sensors.
For the sensing electrode (Na2CO3/BaCO3), the compositions having a barium carbonate rate of 25% or 0% ended in satisfactory results on sensitivity.
The influence of the reference electrode composition was studied for differents values of the Na2Ti3O7/Na2Ti6O13 ratio. Only the composition 55%-45% in mass gave place to a sensor with thermodynamic behavior, with experimental slopes and standard potentials close to the theoretical values until partial pressures of about 100 Pa.
The oxygen has an influence on the response only for the low temperatures. An interference of the water vapor was observed on the standard potential value whatever the temperature, without modification of the sensitivity. The nitric oxyde did not change the response of the sensor.
A model of response time limited by the gas diffusion in electrode material was proposed.
The planar technology led to thermodynamic sensors only for partial pressure above 10-3 bar.
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Submitted on : Thursday, January 26, 2006 - 10:55:16 AM
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Sébastien Baliteau. ETUDE ET REALISATION D'UN CAPTEUR POTENTIOMETRIQUE A DIOXYDE DE CARBONE EN CONFIGURATION OUVERTE. Autre. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011466⟩

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