Relationship between aging time and EMF change of potentiometric CO2 device using Na1+xZr2SixP3-xO12 (0 < x < 3)

被引：12

作者：

Obata, Kenji ^{[1
]}

Matsushima, Shigenori ^{[1
]}

机构：

[1] Kitakyushu Natl Coll Technol, Dept Mat Sci & Chem Engn, Kokuraminami Ku, Kitakyushu, Fukuoka 8020985, Japan

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 139卷 / 02期

关键词：

CO(2) device; NASICON; Li(2)CO(3); EMF drift; Aging time; GAS SENSOR; SOLID-ELECTROLYTE; AUXILIARY ELECTRODE; NASICON; CONDUCTOR;

D O I：

10.1016/j.snb.2009.03.040

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Four kinds of NASICON (Na(1+x)Zr(2)Si(x)P(3-x)O(12), x =1, 1.5, 2 or 2.75)-based CO(2) devices were combined with a Li(2)CO(3)-BaCO(3) (1:2 in molar ratio) auxiliary phase to investigate their CO(2) sensing properties. The EMF values of NASICON devices were correlated linearly with the logarithm of CO(2) concentrations in the range of 250-2500 ppm at 450 degrees C. When exposed to 250 ppm CO(2) for 200 h under dry condition, the EMF of each NASICON device decreased with aging time. To research the cause of the EMF drift, a mixture that consists of NASICON and Li(2)CO(3) was heated at 750 degrees C in air. From X-ray diffraction measurement, it was confirmed that alkali-rich crystal phases such as Li(2)ZrO(3) and Na(5)Zr(PO(4))(3) were formed instead of Na(3)Zr(2)Si(2)PO(12) phase. This Suggests that the EMF drift relates with the formation of alkali-rich crystal phase at the interface between NASICON and auxiliary phase. (C) 2009 Published by Elsevier B.V.

引用

页码：435 / 439

页数：5

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Relationship between aging time and EMF change of potentiometric CO2 device using Na1+xZr2SixP3-xO12 (0 &lt; x &lt; 3)

Relationship between aging time and EMF change of potentiometric CO2 device using Na1+xZr2SixP3-xO12 (0 < x < 3)