Quantitative Model of the Behavior of the Limiting Current Oxygen Sensors
详细信息 查看全文
- 作者：Carlos Ló ; pez-Gá ; ndara ; Francisco M. Ramos ; Soroush Nazarpour ; Albert Cirera ; Albert Corneta
- 关键词：oxygen sensor ; limiting current ; YSZ ; amperometric
- 刊名：Procedia Chemistry
- 出版年：2009
- 出版时间：August 2009
- 年：2009
- 卷：1
- 期：1
- 页码：1019-1022
- 全文大小：448 K
文摘
A physicochemical model of the I(V) response of amperometric oxygen sensors based in ion conduction is proposed. Although the qualitative behavior of these devices is well known, there is a lack of a quantitative description of the response of the sensors in their normal operation conditions. The model focuses on diffusion across a porous layer and minimization of the oxygen-ion electrochemical potential in steady state. It provides an analytical expression describing the current-voltage dependence in terms of oxygen diffusivity, ionic conductivity, temperature and geometrical parameters. Experimental measurements of our owndesigned amperometric ceramic sensors are in agreement with the proposed model.