Oxygen-sensor element and method for producing the same.

摘要

An oxygen-sensor element (1) comprises reference-gas-side and detection-gas-side electrodes (3,4) on both surfaces of a solid electrolyte body (2), and a porous protective layer (5) on the surface of the detection-gas-side electrode,(4) wherein at least a part (5b) (including at least a surface layer) of said porous protective layer is formed by a granular texture of a grain size of 0.1 to 0.5 mu m formed mainly of a nonstoichiometric compound of a transition metal oxide (TiOx), and a catalyst (6) for having gas components of the gas to be measured react is carried in at least a part (including at least a surface layer) of the porous protective layer (5). Improved oxidation reaction of gas components prevents deterioration of the responsive property.