Application of La0.6Sr0.4Co0.2Fe0.8O3 Prepared by Molten Salt Method as Sensitive Electrode in NO2 Sensor
La0.6Sr0.4Co0.2Fe0.8O3(LSCF)perovskite materials were synthesized in KCl,NaCl and KCl-NaCl systems by molten salt method.Using them as sensitive electrodes and yttrium stabilized zirconia(YSZ)as solid electrolytes,impedance-type NO2 sensors were assembled.The effects of different synthesis systems on the sensitivity of the sensors were studied.The phase composition and micro-morphology of LSCF sensitive electrodes were analyzed by X-ray diffractometer,scanning electron microscope and transmission electron microscope.The results show that the particle size of the synthesized LSCF material is related to the melting point of the molten salt system,and X-ray photoelectron spectroscopy shows that the LSCF with low Sr content on the surface can be prepared by KCl system,thus improving the electrical conductivity.The sensitivity test results show that the sensor has good response recovery characteristics at 400 ℃-550 ℃.The sensor with a sensitive electrode based on KCl molten salt system shows the highest sensitivity(15.75degree/decade)and has good anti-interference ability to CH4,CO2,H2,NH3 and NO.
Molten salt methodNO2 sensorImpedance spectrumPerovskite materials
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