Application of advanced morphology Au-X (X = YSZ, ZrO2) composites as sensing electrode for solid state mixed-potential exhaust NOx sensor

SENSORS AND ACTUATORS B-CHEMICAL

卷:207

Article

Romanytsia, Ivan^1,2  Viricelle, Jean-Paul¹  Vernoux, Philippe³  Pijolat, Christophe¹ 

[1] Ecole Natl Super Mines, CNRS UMR5307, LGF, F-42023 St Etienne, France

[2] Measurement Specialties France, F-31027 Toulouse, France

[3] Univ Lyon 1, Inst Rech Catalyse & Environm Lyon, F-69626 Villeurbanne, France

关键词: Gas sensor;    NOx sensor;    YSZ;    Au;    Electrode;    Composite;   

DOI  :  10.1016/j.snb.2014.10.017

来源: Elsevier

【 摘 要 】

Among various NOx sensors developments, mixed potential sensor based on Yttria Stabilized Zirconia (YSZ) with a simple planar architecture Au/YSZ/Pt is of practical interest. Au composites electrodes were investigated to improve sensing performances. Such potentiometric solid-state gas sensors-were fabricated by screen-printing and tested for NO2 detection. Electrochemical impedance spectroscopy has shown that the addition of YSZ in the Au electrode decreased the polarization resistance in air. In addition, the (Au + 10 wt% YSZ)/YSZ/Pt sensor has a shorter response time and higher sensitivity to NO2 (range 20-100 ppm) at 450-550 degrees C in comparison with a reference Au/YSZ/Pt sensor. On the other hand, the addition of non-conductive ZrO2 does not significantly modify the electrochemical property but strongly damages the sensor responses toward NO2. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free