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Titolo:
Stability of NASICON-based CO2 sensor under humid conditions at low temperature
Autore:
Kida, T; Shimanoe, K; Miura, N; Yamazoe, N;
Indirizzi:
Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Dept Mol & Mat Sci, Kasuga, Fukuoka 8168580, Japan Kyushu Univ Kasuga Fukuoka Japan 8168580 , Kasuga, Fukuoka 8168580, Japan Kyushu Univ, Adv Sci & Technol Ctr Cooperat Res, Kasuga, Fukuoka 8168580, Japan Kyushu Univ Kasuga Fukuoka Japan 8168580 , Kasuga, Fukuoka 8168580, Japan
Titolo Testata:
SENSORS AND ACTUATORS B-CHEMICAL
fascicolo: 3, volume: 75, anno: 2001,
pagine: 179 - 187
SICI:
0925-4005(20010515)75:3<179:SONCSU>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLID-ELECTROLYTE; IONIC CONDUCTOR; SELECTIVE ELECTRODE; GAS SENSOR;
Keywords:
NASICON; CO2 sensor; electrode potential; interfacial structure; stability;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Yamazoe, N Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Dept Mol & Mat Sci, Kasuga, Fukuoka 8168580, Japan Kyushu Univ Kasuga Fukuoka Japan 8168580 ukuoka 8168580, Japan
Citazione:
T. Kida et al., "Stability of NASICON-based CO2 sensor under humid conditions at low temperature", SENS ACTU-B, 75(3), 2001, pp. 179-187

Abstract

The NASICON-based CO2 sensor using Li2CO3-BaCO3 auxiliary phase was testedfor stability under exposure to the humid air containing 3.6 kPa H2O and 1000 ppm CO2 at 50 degreesC. For this purpose. the sensor devices were attached with a reference electrode IRE) which was always kept from contacting the humid air, in addition to the sensing electrode (SE) and counter electrode (CE). With this structure, the SE and CE potentials to CO2 containing atmospheres at 450 degreesC were measured relative to RE before and after thehumid air treatment for 3 days. It was found that the humid air treatment caused the CE potential to shift largely from the original value, while theSE potential remained intact. The shift of CE potential decreased gradually with increasing time of operation at 450 degreesC. disappearing almost completely in several days. The SEM observation revealed that a number of tiny deposits showed up on the surface of NASICON after the 3-day treatment and the deposits grew into discrete crystalline particles after the I l-day treatment. It was found in separate experiments that, when the NASICON disk was soaked in hot water, a significant amount of Na3PO4 was eluted from thedisk, and that the resulting disk could have the CE potential more stabilized to the humid air treatment. Based on these results, it is concluded that the elution of Na3PO4 from the bulk of the NASICON disks to the surface is responsible for the degradation of CO2 sensing properties in this type sensor after being kept in a humid atmosphere at low temperature. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 29/09/20 alle ore 23:47:58