| 摘要 |
Multilayer oxygen-consuming electrode for oxygen reduction in an aqueous alkaline medium comprises: at least a carrier, which is electrically conductive; a catalyst-containing layer; a hydrophobic layer; oxygen-containing gas; and a side facing an alkaline electrolyte. The electrode has at least two different catalyst-containing layers exhibiting different amounts of the catalyst. The outermost layer facing the gas side has a lower catalyst proportion than the outermost layer facing the electrolyte side, and the proportion of a hydrophobic material in the hydrophobic layer is up to 8 wt.%. An independent claim is also included for producing the oxygen-consuming electrode, comprising: (a) preparing at least two suspensions by dispersing or mixing the components comprising at least particles of a catalytically active substance, preferably silver particles, a dispersing agent, preferably organic solvent or water (preferred), and particles of a hydrophobic polymer with different proportions of hydrophobic polymers; (b) spraying the suspensions in several steps on the carrier, preferably nickel-carrier for generating the different layers, and heating the carrier to a temperature of 100-160[deg] C, preferably 100-145[deg] C under at least partial removal of the dispersing agent; (c) hot-pressing the electrode obtained in the step (b) under a pressure of 0.04-0.4 t/cm 2>, preferably 0.08-0.3 t/cm 2>and a temperature of 60-200[deg] C, preferably 80-150[deg] C; and (d) subsequently sintering the electrode at a temperature of at least 200[deg] C, preferably up to 400[deg] C. |
