Zirconia based NOx sensor using La based perovskite sensing electrode

Abstract

Sensing characteristics of amperometric NOx sensor using yttria-stabilized zirconia (YSZ) and LaSr-based perovskite-type oxide sensing-electrode (SE) was examined. La0.8Sr0.2MO3(M=Co, Mn, Ni, Fe) was synthesized by means of spray pyrolysis method. The response to NO2 of the sensor using La0.8Sr0.2MnO3-SE was larger than CO, C3H6, NH3 at 600 C in the presence of excess O2 (21%). The sensitivity was increased with increasing NO2 concentration in the examined range between 50 to 800 ppm.