High performance CO2 gas sensing with combination of multivalent ion conducting solid electrolytes with water-insoluble auxiliary electrode

A carbon dioxide gas sensor was fabricated by combination of multivalent ca tion and anion conducting solid electrolytes with a water-insoluble Li and Ba codoped Nd2O2CO3 solid solution as an auxiliary electrode. The present s ensor shows such a high durability not only in the atmosphere of gas phase water vapor coexistence but also after the exposure to the liquid phase wat er dew, in addition to persisting the rapid, reproducible response with a h igh stability from the operation.