Development of Solid Electrolyte Sensors Operative at Ordinary Temperature

常温下工作的固体电解质传感器的开发

基本信息

批准号：
60850151
负责人：
YAMAZOE Noboru
金额：
$ 5.7万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850151/
关键词：
Gas sensor Solid Electrolyte Antimonic Acid Lanthanum Fluoride Hydrogen Carbon Monoxide 酸素

项目摘要

This project has aimed at developing new solid state gas sensors operative at ordinary temperature using solid electrolyte, i.e., <H_2> and CO sensor using proton conductors and oxygen sensor using La <F_3> . The results obtained are as follows.1. Proton conductor sensor: Sensor elements were essentially based on the electrochemical cell (Pt black !proton conductor!Pt black) in which antimonic acid was mainly used as proton conductor. The sensors developed in this project were found to be sensitive to small amounts of <H_2> and CO in air at room temperature and could be classified in the following three categories according to the out-put signals used.(1) Potentiometric sensor; An electromotive force ultilized as sensor signal of the potentiometric sensor was proportional to a logarithum of <H_2> and CO concentration in air and thus this type of sensor was fit for detecting sample gases in a wide-ranging concentration.(2) Amperometric sensor; A short circuit current ultilized as sensor … More signal of the amperometric sensor was in direct proportion to the sample gas concentration under the constant humidity. The amperometric sensor had an advantage over potentiometric one in precise measurement of gas concentration.(3) Four-probe type sensor; Under the short circuit condition, the potential difference which could be detected by Ag probes inserted in the proton conductor was produced in the proton conductor by the contact of the sensing Pt electrode with the sample gas. The potential difference was a linear function of <H_2> concentration independent of humidity in an ambient atmosphere.2. Lanthanum fluoride oxygen sensor; The sensor composed the electrochemical cell (Sn,Sn <F_2> !La <F_3> !Pt, <O_2> )and an electromotive force of the cell was found to change in proportion to a logarithum of oxygen partial pressure even at room temperature.(1) Single crystal sensor; While the newly fabricated elements showed very slow response, exposure to water vapor at 150 ゜C followed by the repetition of response to oxygen reduced the 90% response time to about 2 min at 25 ゜C. This sensor could also respond sensitively to dissolved oxygen in water.(2) Spputered film sensor; By using the sputtered La <F_3> film ( 5 <micro> m thick), the 90% respnse time could be decreased to ca. 30 sec after water vapor treatment. Less

该项目针对使用固体电解质在常温下工作的新型固态气体传感器，即使用质子导体的<H_2>和CO传感器以及使用La<F_3>的氧气传感器，所取得的开发成果如下： 1．传感器：传感器元件本质上是基于电化学电池（铂黑！质子导体！铂黑），其中锑酸主要用作质子导体。室温下对空气中的少量<H_2>和CO敏感，根据所使用的输出信号可分为以下三类：(1)电位传感器；用作电位传感器的传感器信号的电动势成正比。空气中<H_2>和CO浓度的对数，适合检测大范围浓度的样气。(2)采用电流法传感器；由于在恒定湿度下，电流式传感器的信号与样气浓度成正比，在精确测量气体浓度方面，电流式传感器比电位式传感器具有优势。(3)四探头短路式传感器。插入后，通过感测 Pt 电极与样品气体的接触，在质子导体中产生可由质子导体中的 Ag 探针检测的电势差。电势差是与湿度无关的 <H_2> 浓度的线性函数。 2.氟化镧氧传感器；该传感器由电化学电池(Sn,Sn<F_2>!La<F_3>!Pt,<O_2>)组成，并且发现电池的电动势成比例变化。即使在室温下，氧分压的对数也是如此。(1) 单晶传感器；虽然新制造的元件表现出非常慢的响应，但暴露于 150 °C 的水蒸气中后，在 25 ゜C 下，对氧气的重复响应将 90% 的响应时间缩短至约 2 分钟。该传感器还可以对水中的溶解氧做出灵敏的响应。(2) 溅射薄膜传感器；通过使用溅射 La <F_3> 薄膜（ 5）。 <微米>米厚），水蒸气处理后90%响应时间可缩短至约30秒。