Solid electrolyte type nitrogen monoxide gas sensor operating at intermediate temperature region

A new solid electrolyte type nitrogen monoxide (NO) gas sensor which can operate in the intermediate temperature region was fabricated by the combination of trivalent aluminum cation conducting (Al0.2Zr0.8)20/19Nb(PO4)3 and divalent oxide anion conducting yttria stabilized zirconia (YSZ) with LiNO3-doped (Gd0.9La0.1)2O3 as the sensing auxiliary electrode. The present sensor shows such a practical performance of a rapid, stable, continuous, and reproducible response as low as at 523 K, and the linear relationship, which obeys the Nernst theoretical relationship, was clearly observed between the sensor EMF output and the logarithm of the NO concentration. Since the present sensor using the LiNO3-doped (Gd0.9La0.1)2O3 auxiliary electrode shows such a high sensing performance, it is greatly expected to be a new type of the NO gas sensing device applicable in the intermediate temperature range of around 523 K.