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In this work, a novel sensor device is developed. It enables to compare two gas compartments electrochemically by applying the mixed potential sensing principle. Thereby, disadvantages that come along with the usually-used half-cell setups like indirect heating, complicated manufacturing and only destructive dismantling of sample and sealing are overcome. The device bases on an yttria-stabilized zirconia disc that is equipped with an integrated heater to provide a hot area in the center for sensing while at the same time it is cold enough at the outer radius for contacting with a polymer sealing (Oring). As an example for its functionality, the gas mixtures upand downstream of a catalyst were compared, while the sensor voltage correlates well with catalyst conversion.

A6.4 - Novel mixed potential sensor device to compare two gas compartments and to determine directly the conversion of an automotive catalyst