Mixed potential type NO{sub x} sensor based on stabilized zirconia and oxide electrode

A new solid-state NO{sub x} sensor operative at high temperature was designed using stabilized zirconia and an oxide sensing electrode. Among the various oxides examined, CdMn{sub 2}O{sub 4} was found to be the most excellent material for NO{sub x} sensing at 500 C. The EMF values of the sensor were almost linear to the logarithm of NO{sub x} concentration with a positive slope for NO{sub 2} and a negative slope for NO. A nitrogen oxide sensing mechanism involving mixed potential was proposed based on the measurements of polarization curves.