The (La0.8Sr0.2)2FeNiO6-δ (LSFN) oxide powder with double-perovskite structure was prepared by using polymeric precursor method. The oxide powder and LSFN sensing electrode (LSFN-SE) were characterized by X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM). The NO sensing property of NOx potentiometric sensor based on yttria-stablized zirconia (YSZ) was investigated from 300 to 550 °C in 10 vol.% O2. The results demonstrate that the response of the sensor with LSFN-SE sintered at 1300 °C to 600 ppm NO decreases with increasing temperature. The voltage differences of the sensor are good linear to the logarithm of NO concentrations. The NO gas adsorption-desorption behavior of the LSFN was examined. The result of NO-TPD indicates that desorption peak is not observed above 300 °C, which may be one of the reasons for the low sensitivity of NO for the LSFN.
Abstract. The nano-sized (La0.8Sr0.2)2FeNiO6-δ (LSFN) double perovskite powder without impurity phase was successfully prepared using the Pechini method. The result demonstrated that the electrode sensing properties to NO2 were affected by the sintering temperature. The sensor with 1300 ℃ -sintered LSFN sensing electrode exhibited the highest NO2 sensitivity.
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