| 摘要 |
PURPOSE:To improve the low-temperature activity of a zirconia oxygen sensor. CONSTITUTION:A platinum electrode 3 formed on the outer surface of a zirconia tube 1 and coming into contact with a gas to be detected is covered with a porous ceramic protective layer 4. A cerium dioxide CeO2 is added to the protective layer 4, of which main constituents are alumina, zirconia and yttria. Part of the cerium dioxide CeO2 added to the protective layer 4, which is present in the vicinity of a layer of the boundary with the platinum electrode 3, acts as a promoter of the platinum electrode 3 and thereby the catalytic activity of the platinum electrode 3 is improved. |
