Na3Zr2Si2PO12-based CO2 gas sensor with heat-treated mixture of Li2CO3 and Nd2O3 as an auxiliary electrode

被引：24

作者：

Aono, Hiromichi ^{[1
]}

Itagaki, Yoshiteru ^{[1
]}

Sadaoka, Yoshihiko ^{[1
]}

机构：

[1] Ehime Univ, Grad Sch Sci & Engn, Dept Mat Sci & Biotechnol, Matsuyama, Ehime 7908577, Japan

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2007年 / 126卷 / 02期

关键词：

rare earth oxide; dioxymonocarbonate; lithium carbonate; CO2 gas sensor;

D O I：

10.1016/j.snb.2007.03.032

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Carbon dioxide sensing performance of gas sensors using a NASICON (Na3Zr2Si2PO12) solid electrolyte and a Li2CO3-based auxiliary phase was examined. Gradual changes (drifts) in the EMF level with time were observed for the sensor using only Li2CO3 as an auxiliary electrode. A new auxiliary electrode material based on Li2CO3 and Nd2O3 was developed to improve the sensing stability. The mixture of Li2CO3 and Nd2O2+2x(CO3)(1-x)Li-2x was stable to humidity. The Nd2O2+2x(CO3)(1-x)Li-2x phase between an auxiliary electrode and NASICON acted as a stable diffusion boundary layer. For the mixture of Na2CO3 and Nd2O3, a si in i I ar treatment induced formation of only Nd2O2CO3. A higher reactivity of the Li+ ions with Nd2O2CO3 and a lower reactivity of the Na' ions effectively stabilized the diffusion boundary layer. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：406 / 414

页数：9

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