Influence of ceramic oxide materials on lithium based potentiometric CO2 sensors

In these potentiometric sensors, a mixed binary carbonate sensing material consisting of 90 mol% Li2CO3 and 10 mol% BaCO 3 wasmodied by adding ceramic oxide materials such as SiO2,B2O3,La2O3,Bi2O3, CeO2 and In 2O3 in dierent mol% concentrations. Varioussensors mixed with these external oxides have shown good performance at operating temperatures below 300.C. Scanning electronmicroscopy reveals that a glassy sensing phase is formed in the sensing bi-carbonate by the addition of ceramic oxides and sinteredat 600.C for 1 h. The sensor mixed with SiO2:B2O3:Bi2O3 and followed a fair Nernstian behavior with aDEMF/dec value of. 48.18 at as low as 150.C. The decrease in operating temperatureis attributed to the enhanced lithium ion migration through the glassy sensing phase of the sensing electrode. KCI Citation Count: 6