| 摘要 |
PURPOSE:To measure the concn. of oxygen in combustion exhaust gas with good accuracy over a long period of time, by providing a gas diffusion layer composed of MgO or a material based on MgO on the surface of an electrode. 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 is composed of perovskite composite oxide represented by predetermined formula I (wherein Ln 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). Electrode lead-out terminals 5, 6 are respectively provided to a pair of the electrodes 2, 3 and a gas diffusion layer 6 composed of MgO or a material based on MgO is provided on the surface of the cathode 3 and the outer peripheral side surface of the structural body consisting of the electrodes 2, 3, the electrolyte 1 and the diffusion layer 6 is brought to a gas impervious state. By this method, the concn. of oxygen in combustion gas can be measured with good accuracy over a long period of time. |
