摘要
利用碳酸锂-锂钡掺杂氧化碳酸盐复合物作为敏感电极材料,构建YSZ二氧化碳电化学传感器,并借助于二氧化碳响应性能测试和电化学阻抗谱等方法,研究了敏感电极层厚度对传感器性能的影响。结果表明,敏感电极层较薄时,由于电极过程涉及的电活性物质的量较大,而其产生和运移的场所却有限,可能导致局部二氧化碳浓度范围出现传感器响应电动势的波动;敏感电极层厚度增加时,传感器总阻抗增加,其响应电动势比例以及电动势变化率△E均降低,电子转移数偏离理论值2,传感器准确性降低。具体设计过程中,传感器敏感电极层厚度应适中,并结合其工作温度综合考虑。
The YSZ based CO2 sensor having compound of Li2 CO3-Li and Ba co-doped oxycarbonate as its sensing electrode was designed.And the influence of sensing electrode thickness on its performance was studied by the means of CO2 response detection and impedance spectroscopy.Due to the large amount of electro-active substances involved in the electrode processes but with limited space for its production and transmission,the potentiometric sensor with thinner sensing electrode probably suffered from EMF fluctuations in some small CO2 concentration ranges.As the electrode film thickened,total impedance of the sensor increased.Meanwhile,EMF response ratio and△E of the sensor decreased,and its transfer electrons were far from 2.All of these phenomena implied the sensor performance deteriorated with the increase of sensing electrode thickness.In a specific sensor design,the sensing electrode thickness should be reasonable and be considered according to its operation temperature.
作者
王光伟
陈鸿珍
李友凤
谢波
梁兴
WANG Guang-wei;CHEN Hong-zhen;LI You-feng;XIE Bo;LIANG Xing(Department of Chemistry and Chemical Engineering,Zunyi Normal University,Zunyi 563006,China;Chongqing Institute of Green and Intelligent Technology(CIGIT),Chinese Academy of Sciences,Chongqing 400714,China)
出处
《功能材料与器件学报》
CAS
2019年第1期12-18,共7页
Journal of Functional Materials and Devices
基金
国家自然科学基金资助项目(41763008,41203047)
贵州省基础研究计划项目(重点)(黔科合基础[2019]1461号)
贵州省科技支撑计划项目(黔科合支撑[2018]2774)
贵州省普通高等学校科技拔尖人才支持计划项目(黔教合KY字[2017]086)
遵义师范学院博士启动基金项目(遵师BS[2017]02)
重庆市前沿与应用基础研究项目(cstc2015jcyjA20008)
关键词
敏感电极
厚度
CO2传感器
响应
阻抗
sensing electrode
thickness
CO2 sensor
response
impedance
