- 著者
-
松井 光彦
- 出版者
- 公益社団法人 日本金属学会
- 雑誌
- 日本金属学会誌 (ISSN:00214876)
- 巻号頁・発行日
- vol.64, no.5, pp.403-406, 2000
Recently sodium ionic conductors such as NASICON (Na<SUB>3</SUB>Zr<SUB>2</SUB>Si<SUB>2</SUB>PO<SUB>12</SUB>) have been used as the solid electrolyte for EMF(electromotive force) type CO<SUB>2</SUB> sensors. However, it has been hard to obtain a sufficiently high quality in this type of sensor, partly due to the low humidity-resistance of NASICON and partly because of its poor initial response of EMF to CO<SUB>2</SUB> pressure.<BR>For the purpose of improving the humidity-resistance and the initial response of EMF of the solid electrolyte CO<SUB>2</SUB> sensors, Li<SUB>2</SUB>TiSiO<SUB>5</SUB> is employed as the sensing material instead of NASICON. It is composed of the following electrochemical cell:<BR>(This article is not displayable. Please see full text pdf.) <BR>The electrochemical reaction is in good agreement with the Nernst equation, and reacted electron is calculated as 2.04. The sensor fabricated with Li<SUB>2</SUB>TiSiO<SUB>5</SUB> shows good linearity when it is exposed to an atmosphere of 90% relative humidity at 60°C. The initial 90% response of EMF is steadied within 4 min. These experimental results make it possible to use the sensor in the environments.