NOx Sensing Performances of Mixed-Potential-Type Gas Sensor Based on Stabilized-Zirconia and La5/3Sr1/3NiO4 Sensing Electrode

Abstract

Abstract. This article attempts to use a new sensing electrode material La5/3Sr1/3NiO4 for mixed-potential-type NOx sensors as they are high ionic conductivity, close thermal expansion coefficients to electrolytes (YSZ), low-cost and stable even at above 1000 °C. The nanostructured La5/3Sr1/3NiO4 was synthesized as a sensing electrode (SE) for the mixed-potential-type yttria stabilized zirconia (YSZ)-based NO sensor by a sol-gel method. The synthesized La5/3Sr1/3NiO4 powders were characterized using XRD, BET and FESEM. The sensing characteristics were examined in the temperature range of 400-700 °C. At 450 °C, the sensor exhibited the biggest response (about 20.3 mV for 1000 ppm NO). Moreover, the sensor response and recovery were generally rapid at all the temperatures. This work demonstrated that the La5/3Sr1/3NiO4 can be an effective sensing electrode candidate of mixed-potential-type NO sensors.