CO2 Gas Sensing with the Combination of Trivalent Al^3+ Ion Conducting Al2(WO4)3 Single Crystal Solid and Oxide Ion Conducting Stabilized Zirconia

A carbon dioxide gas sensor was fabricated by using a trivalent Al^3+ ion conducting A12(WO4)3 single crystal solid with an oxide ion conducting stabilized zirconia and Li2CO3 as an auxiliary electrode. The sensor response was rapid and reproducible enough for a practical application. In addition, the sensor output was stable and the present sensor would be one of superior promising tool with a compact and maintenance-free type CO2 gas sensing.