Solid Electrolyte-Based NOx Sensor Using Auxiliary Phase of Metal Oxide

Abstract
Solid electrolyte-based electrochemical elements fabricated with sodium super-ionic conductor (NASICON) and auxiliary phases of metal oxides were tested for the detection of NO and NO2 in the range between 10 and 200 ppm. The elements having Cr2O3/NASICON and CuO/NASICON combinations exhibited rather good performance for potentiometric sensing of NO as well as NO2 at 250 °C.