Hybrid Potential NH3 Sensor Based on Bi2O3-Doped La0.75Ba0.25Cr0.5Fe0.5O3-δ(LBCF)Sensitive Electrode
The hybrid potential NH3 sensor was developed using yttrium stabilized zirconia(8YSZ)as solid electrolyte and Bi2O3 modified La0.75Ba0.25Cr0.5Fe0.5O3-δ(LBCF)composite as sensitive electrode.The effects of Bi2O3 content,different porous layer ratios,sintering temperature and operating temperature on the sensing performance were investigated.Bi2O3-modified perovskite La0.75Ba0.25Cr0.5Fe0.5O3-δ composites were prepared by sol-gel method.With the increase of Bi2O3 content,the particle size of the composite increased gradually.LBCF-xBi2O3-SE with porous structure was prepared by silk-printing YSZ slurry on dense YSZ to extend TPB and calcination on YSZ porous skeleton for 3 h.The results showed that the sensitivity of LBCF-xBi2O3-SE sensor to different concentrations of NH3(5×10-6～3 500×10-6)was higher than that of LBCF-SE sensor.Among them,the sensor based on LBCF-30％Bi2O3 had the highest sensitivity,reaching 109.1 mV/dec at 500℃.At 400～600℃,the response value was linear with NH3 concentration.Therefore,the proposed Bi2O3 modified LBCF had significant potential for in-situ ammonia monitoring in industrial applications.
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