Non-Equilibrium Potentiometric CO Sensor Using (BaxLa1-x)2In2O5 (0.4<=x<=0.6) Electrolyte

Abstract

Dense (BaxLa1-x)2In2O5 (BLIO) ceramic electrolytes with different compositions (x=0.4, 0.5, 0.6) were synthesised by Pechini method during which the obtained sintered BLIO electrolytes showed high relative density of ~98% and indicated a pure single cubic phase. The CO sensing properties of as-fabricated planar-type BLIO-based sensors coupled with ITO and Pt as the sensing electrode and reference electrode, respectively was investigated. The sensors showed good sensitivity to different concentrations of CO from 0 to 500ppm and excellent selectivity over low-concentrations of methane (<500ppm). However, the sensors with dense electrolyte indicated more sluggish response compared with the sensors coupled with corresponding porous electrolyte as previously reported. The long-term stability of the sensor for the detection of CO was also investigated which indicated a reasonably stable sensor signal after the initial declination.