Abstract
The electrical signal from yttria-stabilized zirconia (YSZ) electrolyte-based potentiometric gas sensors is dependent on the electrochemical reactivity of the gases around the triple-phase boundary points. However, chemical reactions taking place at these triple-points can influence the performance of gas sensors, typically resulting in reduction of the electrochemical signal. In this paper, the focus is on a NOx sensor using Pt-zeolite Y as the reference electrode and WO3 as the sensing electrode. Significant improvement of NOx sensitivity measured at 600 °C was noted if the sensor assembly was heated to 950 °C as compared to 700 °C. From temperature-programmed desorption (TPD), diffuse reflectance FT-IR (DRIFTS), and chemical reactivity measurements, NOx interaction with YSZ was found to be strong, forming surface nitrates on YSZ and exhibiting high activities toward NOx equilibration. On the contrary, NOx adsorption on heat-treated WO3−YSZ mixtures was found to be weak and the surface was barely active...
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