| 摘要 |
A gas sensor (1) comprises: a pair of porous electrode layers (2b and 2c); a detector element (2) between the porous electrode layers (2b and 2c), wherein the detecting element (2) comprises an oxygen ion conductive solid electrolyte comprising zirconium oxide as a major component, and one of the porous electrode layers is a detecting-side electrode (2b) to be exposed to a gas to be measured; and a ceramic protecting layer (2p) covering the surface of the detecting-side electrode (2b), wherein the ceramic protecting layer (2p) comprises a magnesia.alumina spinel component, an excess magnesium oxide component not involved in the magnesia.alumina spinel component, and a zirconium oxide component.
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