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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

本项目的目的是开发新型的固态气体传感器，在常温下使用固体电解质，即，<H_2>以及使用质子导体的CO传感器和使用La的氧传感器<F_3>。研究结果如下：1.质子导体传感器：传感器元件基本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。在本项目中开发的传感器被发现在<H_2>室温下对空气中的少量和CO敏感，并且根据所使用的输出信号可以分为以下三类。(1)电位式传感器：电位式传感器作为传感信号的电动势与<H_2>空气中CO的浓度成正比，适用于宽浓度范围的气体检测。(2)电流型传感器;短路电流传感器 ...更多信息在恒定湿度下，电流型传感器的信号与样气浓度成正比。电流型传感器在气体浓度的精确测量方面优于电位型传感器。(3)四探针式传感器在短路条件下，传感铂电极与样品气体接触，在质子导体中产生一个电位差，插入质子导体中的Ag探针可以检测到该电位差。电位差是浓度的线性函数<H_2>，与环境空气中的湿度无关.氟化镧氧传感器：传感器组成的电化学电池（锡，锡<F_2>！啦<F_3>！Pt<O_2>），并且发现电池的电动势即使在室温下也与氧分压的三分之一成比例地变化。(1)单晶传感器虽然新制造的元件显示出非常慢的响应，但在150摄氏度下暴露于水蒸气，然后重复对氧气的响应，将90%的响应时间减少到25摄氏度下的约2分钟。该传感器对水中的溶解氧也有灵敏的响应。(2)溅射La<F_3>膜（5 μ <micro>m厚）可使90%响应时间缩短到约100 ms。水蒸气处理后30秒。少