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Carbon dioxide sensor

Image Number 7 for United States Patent #7006926.

A carbon oxide sensor having high sensitivity capable of reduction of influence of humidity is provided. A detection electrode and a counter electrode are provided on one side of an electrolyte, respectively. The detection electrode contains a metal oxide and a metal carbonate including plural components. The metal carbonate preferably contains a first component of alkali metal carbonate and a second component of at least one element selected from the group consisting of alkali earth metal carbonate, transition metal carbonate, zinc carbonate, cadmium carbonate, indium carbonate, lead carbonate and bismuth carbonate. Specifically, it is preferable to contain the first component including Li.sub.2CO.sub.3 and the second component including at least one element selected from the group consisting of BaCO.sub.3, CaCO.sub.3 and SrCO.sub.3.

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