Low temperature operation of thin-film limiting-current type oxygen sensor using graded-composition layer electrodes

被引:15
作者
Inaba, Tadashi [1 ]
Saji, Keiichi [1 ]
机构
[1] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan
关键词
oxygen sensors; zirconia; thin-film; limiting current; PEROVSKITE OXIDE ELECTROLYTE; GAS SENSOR; EXHAUST-GAS; DETECTING HYDROCARBON;
D O I
10.1016/j.snb.2007.09.075
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A thin-film limiting-current type oxygen sensor incorporating graded-composition layers (GCL) was fabricated. The layers were formed by changing the sputtering power so that the mixing ratio of Pt and yttria-stabilized zirconia (YSZ) may changed continuously. The electrode interface resistance of the sensor has greatly decreased by inserting GCL between Pt electrode and YSZ electrolyte. In addition, the temperature dependence of the electrode interface resistance in the sensor with GCL has also become small. Therefore, even if the heat temperature of the sensor with GCL was decreased by 100-150 degrees C more than that of the sensor without GCL, the sensor with GCL could maintain the sensor output. It was demonstrated that the insertion of GCL was highly effective in decreasing the operating temperature of the thin-film limiting-current type sensor. Shortening of the warm-up time can be expected by using this electrode. (c) 2007 Published by Elsevier B.V.
引用
收藏
页码:874 / 880
页数:7
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