The correlation between the sintering temperature and the NO 2 sensing performances of the planar mixed-potential-type yttriastabilized zirconia ͑YSZ͒-based NO x sensor attached with NiO sensing electrode ͑SE͒ was studied by materials characterization techniques, such as impedance analysis, polarization analysis, scanning electron microscopy, and transmission electron microscopy. The sensing properties of the planar YSZ-based NO x sensors were investigated in the operating temperature range of 700-900°C. The NO 2 sensitivity of the present sensor was found to be modulated by changing the sintering temperature of NiO-SE. Rather large sensitivity ͑43 mV͒ to 100 ppm NO 2 was obtained even at 800°C for the sensor using the NiO-SE sintered at 1400°C. A sensing mechanism that involves mixed potential at SE as well as catalysis in gas-phase reaction was discussed based on the results obtained.
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