| 摘要 |
PROBLEM TO BE SOLVED: To restrain the output degradation due to contact resistance in a metal contact of a battery or the like over a long period at a low cost by arranging a conductive contact point having corrosion resistance at least at a part of a conductive gas passage plate abutting on a gas diffusion electrode. SOLUTION: A conductive contact point is not a continuous film but preferably formed into a discontinuous island-like shape, and thereby, a material constituting a protective film can be saved and a film forming time can be reduced. Specifically, a low-conductivity film such as an oxide film formed on the surface of a metallic conductive gas passage plate during a normal storage condition is previously removed in order to secure the conductivity of the protective film and enhance the durability thereof and thereafter, the protective film is formed. At that time, the island-like protective film is formed by adjusting the film forming time and by optimizing the temperature of the gas passage plate. Additionally, it is recommended that the formation of another protective of an organic substance and an oxidation treatment are carried out to the surface of the conductive gas passage plate not covered with the protective film. |
