| 摘要 |
A device for detecting the concentration of oxygen in an automotive exhaust gas, particularly, an automotive exhaust gas containing lead, providing reliable operation for long operating periods. The device includes an oxygen-ion-conductive solid electrolyte positioned between the atmosphere and the gas to be measured, and electrodes made of an electroconductive material, one of which is located on the surface of the solid electrolyte contacted by the atmosphere and the other on the surface of the electrolyte contacted by the exhaust gas. The surface of the electrode in contact with the exhaust gas is coated with a protective, heat-resistive metal oxide layer having supported thereon a uniform layer of a lead-trapping thermally stable metal in a molar amount of 0.4% of the metal oxide.
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