Oxygen sensor and method for manufacturing sensor element

摘要

An oxygen sensor comprising a sensor device having a detection electrode, an electrode protection layer formed on the surface of the detection electrode and a poisoning preventive layer formed on the surface of the electrode protection layer, wherein said poisoning preventive layer comprises a titania powder and a non-titania ceramic powder, and the grain size distribution of primary particles of said titania powder has a peak at 1 µm or less, and the grain size distribution of primary particles of the non-titania ceramic powder has a peak at 10 µm or more.