The solid electrolyte type carbon dioxide sensor element

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PROBLEM TO BE SOLVED : To provide a solid electrolyte type carbon dioxide sensor element capable of highly accurate measurement even when an operation temperature is lowered to a low-temperature region of about 300°C, and having the unchanged electromotive force even when left for long hours in the non-heated state. SOLUTION : In this solid electrolyte type carbon dioxide sensor element, a working electrode layer containing an electron conductive material and a metal carbonate and a reference electrode layer containing the electron conductive material are formed on the solid electrolyte layer surface. The sensor element has a characteristic wherein the working electrode layer contains a carbonate oxide of a rare earth element, preferably La2O2CO3, Nd2O2CO3or the like, and a zeolite. COPYRIGHT : (C)2004, JPO&NCIPI