Carbon dioxide sensor using solid electrolytes with zirconium phosphate framework (2). Properties of the CO2 gas sensor using Mg1.15Zr4P5.7Si0.3O24 as electrolyte

Abstract We report EMF type, all solid-state CO 2 gas sensors using Mg 2+ ion conductor in Mg 1.15 Zr 4 P 5.7 Si 0.3 O 24 [MgZrPSiO], having a cell construction of Pt¦CO 2 , O 2 ¦metal carbonate (Na 2 CO 3 or K 2 CO 3 )∥solid electrolyte ¦O 2 , Pt. The sensors showed Nernstian response to CO 2 in pressure range between 0.5 and 60 kPa, at temperatures from 300 to 500 °C. A change in solid electrolyte from MgZr 4 (PO 4 ) 6 to MgZrPSiO brought about a considerable reduction in response time.