Galvanic CO2 sensor with Li2O: B2O3 glass ceramics based composite

In order to develop an electrolyte with better thermal-stability, a new composite is prepared by partially crystallizing the lithium borate glass along the grain boundaries of Li2CO3: BaCO3 binary system. Highly dense material is obtained on controlled partial crystallization. The structural and electrical characterization proved its composite nature with enhancement in conductivity. A few potentiometric CO2 gas sensors prepared by using optimized composite electrolyte with lithium titanate as the reference electrode. This configuration resulted in a device of high mechanical strength with ease of fabrication and free from interfacial failures. Reproducible and reversible response is obtained for these sensors over a long-term operation at lower temperatures (275 – 450 °C). The sensor response found to obey Nernst relation with sensitivity and emf approaching the theoretical value.