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Development of SO_x gas sensor utilizing the improved beta-alumina solid electrolyte

改进型β-氧化铝固体电解质SO_x气体传感器的研制

基本信息

批准号：
02505005
负责人：
KOZUKA Zensaku
金额：
$ 26.24万
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 (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

The reaction between beta-alumina and rare-earth oxides (Nd_2O_3,CeO_2,Pr_6O_<11>) have been investigated. By using the thin film of rare-earth oxide and Na^+- beta-alumina pellet as samples, the following experimental results could be found. At 1073ﾟK,Pr_6O_<11> reacted with beta-alumina and the existence of some new compounds were confirmed. In the case of CeO_2 the extra pattern except the characteristic ones of CeO_2 and beta-alumina were not found and it was concluded that CeO_2 was not reacted with beta-alumina Nd_2O_3 reacted with beta-alumina and C-type compound was found and follows transformed to A-type one.The reaction between beta-alumina pellet and air-SO_x gas mixture have been investigated based on the variation of electritic conductivity of cell with time at 1023 K. The electritic conductivity changed suddenly with the gas flowing into the cell and follows kept nearly constant value it was confirmed that the surface of Na^+-beta-alumina pellet was covered by stable Na_2SO_4 phase within one hour.From above experimental results, it could be concluded that the best solid electrolyte is the Na^+-beta-alumina covered with CeO_2. The SO_x gas sensor employing Na^+-beta-alumina covered with CeO_2 solid electrolyte was constructed and the responsivility of this sensor at 873 and 1023ﾟK have been investigated. The equilibrium e.m.f. wasfound to change reliably with the change in P_<so2>. In particularly. the characterization of response to a change in P_<so2> at lower temperature was promoted by means of utilizing the Na^+-bate-alumina diskcovered by CeO_2. Many useful experimental results have been obtainedfor development the practical SO_x sensor.

研究了β-氧化铝与稀土氧化物(Nd_2O_3、CeO_2、Pr_6O_(11))的反应。以稀土氧化物薄膜和Na~(++)-β-Al_2O_3球团为样品，得到了如下实验结果。在1073ﾟK，Pr6O&lt；11&gt；与β-Al_2O_3反应，证实了新化合物的存在。在CeO_2的情况下，除了CeO_2和β-Al_2O_3的特征外，没有发现额外的模式，这表明CeO_2不与β-Al_2O_3反应，与β-Al_2O_3反应，发现了C型化合物并转变为A型化合物。根据1023K时电池电导率随时间的变化，研究了β-Al_2O_3颗粒与空气-SO_x混合气体的反应，证实了电导率随着气体进入电池而突然变化，并几乎保持不变在1小时内，Na~+-β-Al_2O_3球团表面被稳定的Na_2SO_4相覆盖。结果表明，CeO_2包覆的Na~+-β-Al_2O_3是最好的固体电解质。用CeO_2包覆的Na~+-β-Al_2O_3制作了SOx气体传感器，并研究了传感器在873K和1023ﾟK下的响应性。均衡电动势。随着P_&lt；SO2&gt；的变化而变化比较可靠。尤其是。利用CeO_2包覆的Na~(++)-Bate-Al_2O_3盘，促进了低温下对P_t；SO_2&gt；变化的响应特性的表征。为研制实用的SO_x传感器提供了许多有用的实验结果。