Design of High-Performance Environmental Gas Sensors Using Solid Electrolytes and Multi-Component Auxiliary Electrodes

采用固体电解质和多组分辅助电极的高性能环境气体传感器的设计

基本信息

批准号：
03453090
负责人：
YAMAZOE Noboru
金额：
$ 4.67万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Sensing properties of solid electrolyte oxygenic gas sensor were greatly improved by using multi-component auxiliary electrode. 1. The use of a binary nitrate electrode of NaNO_3-Ba(NO_3)_2 for solid electrolyte NO_2 sensor made it possible to stand operation at higher temperature up to 500ﾟC,as well as to suppress the interference of water vapor. An NO_2 sensor using Ba(NO_3)_2 auxiliary electrode and Ba-beta/beta"-alumina was found to show quicker responses and to stand higher temperature operation. A NASICON-based solid electrolyte device fitted with an NaNO_2 auxiliary electrode showed excellent sensing characteristics to NO and NO_2 in air,i.e., the electromotive force (EMF) followed the Nernt's equation for 1 - 800 ppm NO and 0.1 - 200 ppm NO_2 at temperatures of 150-240ﾟC. The response of these sensors were found to be totally independent of coexisting oxygen. 2. A NASICON-based CO_2 sensor was greatly improved in response and water vapor-resistance by using binary carbonate ele … More ctrodes of Na_2CO_3-BCO_3(B=Ca,Sr,Ba). These sensors could respond very well to CO_2 in air over a wide temperature range of 270-600ﾟC. The CO_2 sensor was further improved in stability by using Li-based binary carbonate electrodes of Li_2CO_3-BCO_3(B=Ca,Sr,Ba). The sensor responses, EMF, to varying partial pressure of CO_2 were in accordance with a 2-electron reaction of CO_2, while the response to a fixed P_<CO2> was found to be almost independent of partial pressure of O_2 at temperatures above 450ﾟC, while at 305ﾟC and below, it dependent on P_<O2> in a manner similar to a 2- electron reaction of O_2. Thus, two-types of sensing electrode reactions including peroxycarbonate or peroxide were indicated to occur depending on working temperature. 3. Electrochemical cells using MgO-stabilized zirconia tube coated with metal sulphates were found to exhibit fairly good sensing properties to 20-200 ppm SO_2 in air at 650-800ﾟC. SO_x sensor using Li_2SO_4-CaSO_4-SiO_2 auxiliary electrode showed quicker response, 90% response and 90% recovery time to 20 ppm SO_2 at 650ﾟC were 10_s and 7 min, respectively. This sensor exhibits excellent selectivity and good stability in long-term operation. Less

通过使用多组分辅助电极可极大地提高固体电解质氧气传感器的传感性能。 1。使用固体电解质NO_2传感器的nano_3-BA（NO_3）_2的二元硝酸盐电极的使用使得在高达500 c的较高温度下进行操作，并抑制水蒸气的干扰。使用BA（NO_3）_2辅助电极和BA-BETA/beta的NO_2传感器“ -Amumina A基于NASICON的固体电解质设备，该固体电解质设备拟合了Nano_2辅助电极显示出极好的敏感性特征，对空气中的NO和NO_2均具有no_2，即no_2，即no。 NO_2在150-240的温度下，这些传感器的响应完全独立于共存的氧气。2通过使用Li_2Co_3-BCO_3（B = CA，SR，BA）的LI基于LI_2CO_3-BCO_3的二元碳酸盐电极进一步改善了CO_2传感器的宽温度范围。 O_2在450℃以上的o_2的部分压，而在305°C及以下时，它以类似于O_2的2电子反应的方式取决于P_ <o2>。这是根据工作温度而发生的两种传感器电子反应，包括过氧碳酸盐或过氧化物。 3。使用涂有金属硫酸盐的Mgo稳定的氧化锆管的电化学细胞被发现在650-800 ﾟC的空气中存在相当好的敏感性特性，可为20-200 ppm so_2。 SO_X传感器使用LI_2SO_4-CASO_4-SIO_2辅助电极显示更快，响应更快，90％的响应和90％的恢复时间为650 c的20 ppm SO_2分别为10_s和7分钟。该传感器在长期操作中具有出色的选择性和良好的稳定性。较少的