| 摘要 |
PURPOSE:To achieve stabilization of an electrode characteristic by forming a cathode from a perovskite type compound oxide of a specified composition to invert the polarity of the electrode at a specified cycle. CONSTITUTION:A platinum electrode is formed on a oxygen ion conducting solid electrolyte substrate 1 while a perovskite type compound oxide as given by a formula of Ln1-xAxCo1-yMeyO5-delta(Ln represents one element or more of La, Ce, Pr and Nd, A one element or more of Sr, Ca and Ba and Me one element or more of Ni Fe, Mn, Cr and V with 0<=x<=1 and 0<=y<=1 and deltarepresents a lack of oxygen) is attached by a frame coat spraying to form a cathode 3. Then, an inorganic gas diffusion layer 6 is formed on the cathode 3 and a non-gas permeable seal 7 is provided. With such an arrangement, the polarity of a voltage to be applied between the electrodes 2 and 3 by a voltage application means 9 is inverted at a specified cycle through a polarity inversion means 8. This can maintain a stable characteristic for a long time thereby achieving a higher accuracy. |
