Effects of electronic probe's architecture on the sensing performance of mixed-potential based NOx sensor

The effects of electronic probe's architecture on the sensing performance of NiO-YSZ composite sensing electrode for a mixed-potential based gas sensor towards the highly toxic NO2 were investigated. Multiple architectures were prepared using the platinum (Pt) wire by including or excluding Pt paste. The gas sensing measurements were performed in a temperature range of 550-650 degrees C. The dependence of sensor response (Delta V) over the concentration of nitrogen dioxide and oxygen was measured. In addition, the sensing mechanism and effect of different architectures on the anodic and cathodic currents was investigated by polarization curves measurement. More importantly, it was observed that the response, sensitivity, as well as response-recovery dynamics of these sensors, are greatly dependent on the electronic probe's architecture.