2025 SMSI Bannerklein

P1.6.5 NASICON-based CO2 sensor operative at room temperature with Li2CO3-based auxiliary as a sensing electrode

Event
14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
Chapter
P1.6 Electrochemical-based Sensors
Author(s)
K. Obata, S. Matsushima - Department of Materials Science and Chemical Engineering, Kitakyushu National College of Technology (KCT) (Japan)
Pages
1054 - 1056
DOI
10.5162/IMCS2012/P1.6.5
ISBN
978-3-9813484-2-2
Price
free

Abstract

A Potentiometric NASICON (Na3Zr2Si2PO12)-based CO2 sensor operative at room temperature was fabricated by combining with a metal oxide (ITO: indium tin oxide) and Li2CO3-In2O3 (4:1 in molar ratio) auxiliary as a sensing electrode, and its CO2 sensing properties were examined under 30% RH (relative humidity) in the temperature range of 30 to 100 °C. When the Li2CO3-In2O3-attached sensor was operated in the range of 250 to 2500 ppm CO2 at 30 °C, the EMF (electromotive force) change of the sensor was 30.4 mV. The EMF values were correlated linearly with the logarithm of CO2 concentration. In addition, to evaluate the interfluence of coexisting NO2, the Li2CO3-In2O3-attached sensor was measured under 30 %RH in the range of 2 to 7 ppmNO2 between 30 and 100 °C. As the result, it was found that the sensor attached with Li2CO3-In2O3 auxiliary showed the high selectivity to CO2 as compared with the sensor attached with Li2CO3-BaCO3(1:2 in molar ratio) auxiliary phase.

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