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The Development of New Type of Carbon Dioxide Gas Sensor Based on Lithium Conductor

基于锂导体的新型二氧化碳气体传感器的研制

基本信息

批准号：
02555163
负责人：
ADACHI Gin-ya
金额：
$ 8.51万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

The object of this research is to develop a portable carbon dioxide gas sensor by using a solid electrolyte based on lithium ionic conductor. The electromotive force (EMF) measurements were carried out with several CO_2 gas concentrations. The sensor was set up by using LiTi_2 (PO_4)_3+0.2Li_3PO_4 sintered material as the solid electrolyte, Li_2CO_3 as the detecting electrode, and CaCO_3 as the reference electrode. The measured EMF was in good agreement with the calculated EMF for the gas content from 80 ppm to 1 %. The response time was within several minutes.In a practical application, this type of sensor is expected to be installed in exhaust gas atmosphere. The influence of several gases coexistence with carbon dioxide was investigated. No influence was observed with NO_2 gas copresence from 100 ppm to 450 ppm. This is beca. Mse that lithium nitrate decomposes at the operating temperature of 650ﾟC. The EMF value becomes lower than the calculated EMF even at the SO_2 gas content of 20 ppm. This is ascribed to the formation of lithium sulfate on the electrolyte surface.One another gas should be investigated is water vapor. The sensor can detect the C0_2 concentration from 1000 ppm to 1 % at the water vapor concentration of 0-220g/m^3. The EMF output decreses in the CO_2 gas content lower than 1000 ppm. This phenomenon occurs by the chemical reaction between water vapor and lithium carbonate. In order to lower the operating temperature from 650ﾟC, several electrodes were selected as candidates. The sensor can detect the CO_2 gas concentration from 100 ppm. to 1 % at 350ﾟC in the case that Li_2CO_3-K_2CO_3-Na_2CO_3 eutectic mature was applied as the electrode.

本研究的目的是利用锂离子导体为固体电解质，研制一种便携式二氧化碳气体传感器。对几种CO_2气体浓度进行了电动势（EMF）测量。该传感器以LiTi_2（PO_4）_3+0.2Li_3PO_4烧结材料为固体电解质，Li_2CO_3为检测电极，CaCO_3为参比电极。测量的电动势是在良好的协议与计算电动势的气体含量从80 ppm到1%。在实际应用中，这种传感器有望安装在废气环境中。研究了几种气体与二氧化碳共存时的影响。NO_2气体浓度在100 ~ 450 ppm范围内，无影响。我是贝卡。硝酸锂在650摄氏度的工作温度下分解。即使在SO_2含量为20 ppm时，电动势值也低于计算值。这归因于在电解质表面上形成硫酸锂。另一种应该研究的气体是水蒸气。该传感器可在0- 220 g/m^3的水蒸气浓度范围内检测1000 ppm ~ 1%的CO_2浓度。当CO_2气体含量低于1000 ppm时，电动势输出下降。这种现象是由水蒸气和碳酸锂之间的化学反应引起的。为了将工作温度从650 ° C降低，选择了几个电极作为候选。该传感器可检测100 ppm以上的CO_2气体浓度。以Li_2CO_3-K_2CO_3-Na_2CO_3共晶为电极材料，在350 ℃时，电极的电阻率可达1%。