Carbon dioxide sensor using solid electrolytes with zirconium phosphate framework

Abstract We adopted divalent cationic conductor, MgZr 4 (PO 4 ) 6 (MgZP), for the first time as the electrolyte of EMF type CO 2 gas sensors, having the following cell construction: Pt|CO 2 , O 2 | metal carbonate | solid electrolyte |O 2 , Pt. In the case of sodium carbonate (Na 2 Co 3 ), the sensor showed the Nernstian response to CO 2 in pressure range between 1 and 100 KPa at temperatures from 400 to 500°C within a few minutes.