WATER-VAPOR INFLUENCE ON CARBON-DIOXIDE DETECTION OF THE SENSOR BASED ON LITHIUM CONDUCTING SOLID ELECTROLYTE

The influence of the water vapor on the CO2 selectivity of the sensor based on a lithium ionic conductor has been investigated. In a CO2 gas concentration higher than 1000 ppm, the sensor was able to detect the CO2 content continuously even when the vapor coexisted up to 222.8 g/m3. In a CO2 concentration lower than 1000 ppm, EMF deviated lower with the increase of the water vapor content. This might be attributed to the lithium hydroxide formation on the solid electrolyte surface by the chemical reaction between the Li2CO3 +Li2O electrode and water vapor in the atmosphere.