纳米YSZ基扩散控制极限电流型氧传感器的研究

The study of diffusion-controlling limiting current type oxygen sensor using nanocrystals YSZ based

讨论了极限电流型氧传感器的结构和原理 ;制作了以纳米 (2 0～ 3 0nm)YSZ粉体为原料的电解质基片、Pt电极上带有多孔涂层的扩散控制极限电流型氧传感器。实验测定了氧在 0～ 3 7% (mol) ,温度在 60 0～ 70 0℃范围内传感器的输出特性。结果表明 :在上述条件和V =0 .3～ 1.3V电压范围内 ,极限电流 (IL)与氧气浓度成线性关系 ;IL∝T0 .6。

The structure and the principle of limiting current type oxygen sensor were discussed. Oxygen sensor of limiting current type with a porous layer on platinum film electrode to limit the diffusion rate of oxygen was fabricated using the solid electrolyte of nanocrystalline(20～30nm)YSZ based. The relation between temperature and oxygen concentration is tested at 600～700℃ in a mixture of N 2 O 2 with the oxygen concentration being 0～37%(mol). Experimental results show that the magnitude of limiting current ( I L) was in a linear relation with the concentration of oxygen in a gas mixture of O 2 N 2 at 600～720℃ and at voltages ranging from 0.3～1.3V. The temperature dependence of limiting current ( I L) was I L∝ T 0.6 , which can be explained by taking into account a mixed diffusion control mechanism of the molecule and Knudsen diffusion.