| 摘要 |
An electrochemical cell for determining the concentration of a component of a measurement gas comprises a solid electrolyte body, and a pair of electrodes which are disposed on the solid electrolyte body and spaced apart from each other, such that one of the electrodes is exposed to the measurement gas via a porous ceramic diffusion layer having a predetermined diffusion resistance to the component of the measurement gas. In use the atmosphere adjacent to the exposed electrode is controlled by application of an electric current thereto to the pair of electrodes. To achieve uniform characteristics of such cells, their method of manufacture includes preparing a laminar structure of the electrochemical cell such that an unfired or calcined layer for the said one electrode is covered by an unfired or calcined layer for the porous ceramic diffuison layer, starting a firing process to fire the laminar structure at predetermined elevated temperature(s), applying an electric voltage or current to the electrodes, and terminating the firing process when a value of current flowing through the electrodes or a value of voltage present between the electrodes has become equal to a predetermined value. This predetermined value is that at which a desired rate of diffusion of the gas component through the porous ceramic diffusion layer to the electrode is obtained. |
