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NO x  is one of dangerous air pollutants, and the demands for reliable sensors to detect NO x  are extremely urgent recently. Conventional fluorite-phase YSZ used for NO x  sensor requires higher operating temperature to obtain desirable oxygen ion conductivity. In this work, perovskite-phase Na 0.5 Bi 0.5 TiO 3  (NBT) oxygen conductor was chosen as the solid electrolyte to fabricate a novel highly sensitive NO 2  sensor with CuO as the sensing electrode and Pt as reference electrode. Na dopped Na 0.5 Bi 0.5 TiO 3  greatly improved the sensing performance of this sensor. The optimal sensor based on Na 0.51 Bi 0.50 TiO 3−δ  exhibited good response-recovery characteristics to NO 2  and the response current values were almost linear to NO 2  concentrations in the range of 50–500 ppm at 400–600 °C. The response current value towards NO 2  reached maximum 11.23 μA at 575 °C and the value on NO 2  is much higher than other gases (CH 4 , C 2 H 4 , C 3 H 6 , C 3 H 8 , CO), indicating good selectivity for detecting NO 2 . The response signals of the sensor were slightly affected by coexistent O 2  varying from 2 to 21 vol% at 575 °C. The response current value decreased only 4.9% over 2 months, exhibiting the potential application in motor vehicles.

A Novel Highly Sensitive NO2 Sensor Based on Perovskite Na0.5+xBi0.5TiO3−δ Electrolyte