| 摘要 |
PURPOSE:To measure the concn. of oxygen in combustion exhaust gas with good accuracy over a long period of time, by constituting an electrode of perovskite type composite oxide and oxygen ion conductive solid electrolyte. CONSTITUTION:A pair of electrodes 2, 3 at least an electrode 3 working as a cathode, provided on a substrate composed of an oxygen ion conductive solid electrolyte 1 consists of perovskite composite oxide 3 represented by formula I (wherein Ln is at least one element selected from La, Ce, Pr and Nd, A is at least one element selected from Sr, Ca and Ba, Me is at least one element selected from Ni, Fe, Mn, Cr and V, 0<=x<=1, 0<=y>=1 and delta is an oxygen deficient amount) and the electrolyte 1. Electrode lead-out terminals 4, 5 are provided to the electrodes 2, 3 and, further, the outer peripheral end surface of the structure consisting of the electrodes 2, 3, the substrate composed of the electrolyte 1 and a gas diffusion layer 6 is brought to a gas impervious state. By this method, the concn. of oxygen in combustion exhaust gas can be measured with good accuracy over a long period of time. |
