| 摘要 |
A gas sensor for specifying a concentration of a predetermined gas component in a measurement gas on the basis of a current flowing in an oxygen ion conductive solid electrolyte by decomposition of the predetermined gas component, includes an internal space to which the measurement gas is introduced from an outside; a reference gas space to which a reference gas is introduced; a pumping cell provided to be capable of pumping out oxygen in the internal space by applying a predetermined voltage between a first electrode formed on a surface of the internal space and a second electrode formed on a different space from the internal space; and a measuring cell provided to be capable of measuring a current flowing between a measuring electrode formed on the surface of the internal space and a reference electrode formed to make contact with a reference gas, by applying a voltage between the measuring electrode and the reference electrode; wherein the first electrode is formed of porous cermet consisted of a noble metal and an oxygen ion conductive solid electrolyte, and the porosity of the first electrode is greater than or equal to 10% and less than or equal to 50%. |
