P2.6.5 Half-cell characterization of a novel NH3 gas sensor

Daniela Schönauer-Kamin, Ralf Moos & Maximilian Fleischer
The function of a novel electrochemical NH3 gas sensor for application in SCR-systems is investigated. It provides a semi-logarithmic characteristic curve with a high NH3-sensitivity and marginal NOx cross interference at 550 °C. The electrochemical cell of the sensor device can be defined as Au | YSZ | Au, VWT. It is assumed that the sensing mechanism is based on nonequilibrium conditions (mixed potential theory) including electrochemical kinetics. This paper describes the investigation of electrode...