| 摘要 |
PURPOSE:To improve sensitivity and durability by forming catalyst metal electrodes by reducing and thermally decomposing a solution of catalyst metal salt, applied on the surface of a sinter of an oxygen ion conductive solid electrolyte, and further by forming a protective electrode by thermally decomposing in an irreducible atmosphere the above-mentioned solution applied on those electrodes. CONSTITUTION:On both sides of sinter 9 of an oxygen ion conductive solid electrolyte consisting of 92mol% ZrO2 and 8mol% Y2O3, a solution of catalyst metal salt such as H2PtCl6 is applied and, after reduced at the normal temperature in an H2 atmosphere, baked in an H2 atmospheric furnace at about 600 deg.C to form catalyst metal electrodes 10 and 11. The quantity of sticking catalyst metal should be between 0.1 and 10cmg/cm<2>. On electrodes 10 and 11, the above-mentioned catalyst metal salt solution is applied and baked at about 600 deg.C in an irreducible atmosphere (N2, air, Ar, etc.) to form a protective electrode. The quantity of sticking catalyst metal of the protective electrode should be between 1 and 30mg/cm<2>. On exhaust- gas-side electrode 10, overcoat layer 12 of ceramics, etc., is formed by a flame coating method, etc., so as to prevent electrode 10 from deteriorating. |
