Abstract
A planar sensor was fabricated using a yttria-stabilized zirconia (YSZ) plate and laminated-oxide sensing electrode (SE) aiming for selective detection of NO 2 at high temperature. The NO 2 sensing characteristics as well as the cross-sensitivity to various gases were examined in the temperature range of 700–900 °C under the wet condition (5 vol.% H 2O). It was found that the sensor attached with the laminated hetero-oxide layer (Cr 2O 3/NiO (+WO 3)) could detect NO 2 selectively at 895 °C. It was speculated that the additional oxide layer (Cr 2O 3) placed on the NiO (+WO 3) layer acted as a catalyst for the oxidation of CO, hydrocarbons and NO, and then led to better NO 2 selectivity.
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