| 摘要 |
PROBLEM TO BE SOLVED: To suppress the corrosion reaction at an anode and to improve the life thereof by disposing a thin film of a solid polymer electrolyte having the acidity weaker than the acidity of a solid polymer electrolyte film between the anode and the electrolyte film. SOLUTION: The film 20 of the solid polymer electrolyte having the weak acidity is formed as the extremely thin layer on the surface layer of the solid polymer electrolyte film 1 and is interposed between an anode catalyst layer 4 and the solid polymer electrolyte film 1 to prevent the contact of both. More preferably the solid polymer electrolyte film 1 is a sulfonic acid type and the film 20 is carboxylic acid type. When the generation of ozone is ceased by stopping the impression of voltage, the potential of the anode falls and the lead tends to elute from the anode catalyst layer 4 containing lead oxide. The acidity of the film 20 in contact with the lead dioxide is, however, weak and there is no possibility that the anode potential enters a region of Pb2+ if the atmosphere is the air atmosphere. Namely, the anode is stably maintained as the lead dioxide even if voltage is not impressed at the time of stoppage. |
