THIN AND THICK-FILM ELECTROCHEMICAL CO2 SENSORS

Thin and thick film electrochemical CO2-sensors were constructed by incorporating a sodium ion conductor like NASICON or beta-alumina with a solid, gas sensitive layer such as Na2CO3 as measuring electrode. Our results confirmed, in accordance with works published by Maruyama et al. that the EMF of the cell depends logarithmically on the CO2 partial pressure in a CO2/O2 gas mixture. For the practical use, however, stability, sensitivity and selectivity of the sensors should still be improved.