A Stable Sensing-Electrode Material in Reducing Atmosphere at High Temperature for Zirconia-Based Amperometric NOx Sensor

Abstract

La 0.8 Sr 0.2 Al 1−x Mn x O 3 (x = 0, 0.2, 0.4, 0.6) were synthesized using a spray pyrolysis method as a stable sensingelectrode (SE) material in high-temperature reducing atmosphere for zirconia-based amperometric NOx sensor. The XRD diffraction pattern of the La 0.8 Sr 0.2 AlO 3 oxide after treatment in a reducing atmosphere (in 4 vol.% H 2 at 750°C for 2 h) was same with the one as-prepared. A response to 500 ppm NO 2 of a sensor using the oxide after treatment as an SE was −1.3 µA, a value approximately equal to that obtained using an oxide before treatment.

In-situ Thermoelectrochemistry

“…The latter do not fit perfectly into the classification scheme used below. Further important application examples of electrochemical sensors with solid oxide electrolyte are analysis of CO 2 and SO 2 [186], of reducing vapours [187] and of nitrogen oxides [188][189][190]. In the case of fuel cells, not always both compartments of the cell must be under increased pressure.…”