Carbon dioxide gas sensing with the combination of divalent magnesium cation and divalent oxide anion conducting solid electrolytes with neodymium oxycarbonate based auxiliary electrode

Carbon dioxide gas sensing was successfully realized by the combination of divalent magnesium ionic conducting Mg-0.7(Zr0.85Nb0.15)(4)P6O24 solid solu tion and oxide anion conducting solid electrolytes with the water insoluble Li and Ba codoped Nd2O2CO3 solid solution as the auxiliary electrode. The response was rapid and a reproducible output was continuously observed. The present sensor also demonstrated a theoretical Nernstian response even aft er the treatment in such a high humid atmosphere of water vapor saturated a t 50 degreesC.