| Project/Area Number |
02555163
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | Osaka University |
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Principal Investigator |
ADACHI Gin-ya Osaka University, Applied Chemistry, Professor, 工学部, 教授 (60029080)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMURA Yoshio Japan Synthetic Rubber Co. Ltd. Director of Electronics Research Institute, エレクトロニクス研究所, 所長
SAKAGUCHI Hiroki Osaka University, Applied Chemistry, Research Associate, 工学部, 助手 (00202086)
MACHIDA Ken-ichi Osaka University, Applied Chemistry, Associate Professor, 工学部, 助教授 (00157223)
村松 喜雄 日本合成ゴム(株), エレクトロニクス研究所, 所長
今中 信人 大阪大学, 工学部, 助手 (30192503)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥13,300,000 (Direct Cost: ¥13,300,000)
Fiscal Year 1991: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥11,200,000 (Direct Cost: ¥11,200,000)
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| Keywords | Lithium / Ionic Conductor / Solid Electrolyte / Carbon Dioxide Gas / Sensor / 炭酸ガスセンサ / リチウムイオン伝導体 / 地球温暖化 / 温質効果 |
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| Research Abstract |
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.
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