Abstract
Solid-state potentiometric CO 2 sensors were fabricated using Na + conductor (Na 3Zr 2Si 2PO 12) as a solid electrolyte, Li 2CO 3–BaCO 3 fused carbonate with different compositions as a sensing electrode and the Na 2Ti 6O 13–Na 2Ti 3O 7 or TiO 2–Na 2Ti 6O 13 two phase systems as a reference electrode. The measured electromotive force of the investigated cells was found to be linear with the logarithm of CO 2 partial pressure in the range 100–12 600 ppm of CO 2 and in the temperature range 300–500 °C. The response time was ca. 40–120 s. The sensors exhibited reproducible signal during short-time experiments (<24 h). However, the unstable behaviour was observed during long-time measurements (several weeks) in case of some sensors, and it was found to be sensor composition dependent. A sensing mechanism is proposed on the basis of the sensing characteristics obtained. The possible explanation of the observed long-time instability of investigated sensors is also given.
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