An amperometric solid state NO sensor using a LaGaO3 electrolyte for monitoring exhaust gas

A LaGaO3-based electrochemical sensor in the amperometric mode was demonstrated as highly sensitive to NO in the temperature range 500-700 degrees C. Sensor performance was found dependent on the Ni doping of LaGaO3. Using optimized electrode materials, highest sensitivity was achieved as high as 2409 mu A/decade (at 550 degrees C) when Ni doping to electrolyte was 7 mol%. The selectivity of the sensor was found very high to NO with respect to the typical coexisting gases in the exhaust environment. The sensing principle was observed to follow the mixed potential behavior.