Nox sensor with catalytic filter and polarisation
Capteur NOx à filtre catalytique et polarisation
Résumé
The invention relates to an NOx gas sensor which is intended for being arranged in a stream of gas of an exhaust device of a heat engine. The sensor includes a sensing element comprising a solid electrolyte having a first surface over which a work electrode, a reference electrode and a counter electrode extend. The work electrode is made of a material which has lower electrocatalytic and catalytic activity than the material of the reference electrode and the counter electrode, and the sensor includes a catalytic filter surrounding the sensing element and means for negatively polarising the work electrode. The invention also presents a detection device including a plurality of sensors of this type, and a corresponding catalytic exhaust device.