Galvanic CO_2 Sensor with Li_2O:B_2O_3 Glass Ceramics Based Composite

摘要

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 L_2CO_3:BaCO_3 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 CO_2 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 deg C).The sensor response found to obey Nernst relation with sensitivity and emf approaching the theoretical value.