| 摘要 |
PURPOSE:To provide a button-type air cell having higher average continuous voltage and larger net capacity, by employing a manganese oxide carrying a metal with catalytic activity and activated carbon as catalyzers so as to prevent deterioration in catalytic activity of the manganese oxide due to its hydrophilic property. CONSTITUTION:Preparing a solution of 200ml of water mixed with 300ml of methanol, 1.5g of polyvinyl alcohol is dissolved therein, 20ml of chloroplatinic acid solution containing 10mg/ml of platinum is added thereto, and 10g of a manganese oxide whose degree of oxidation being 1.6 is further added thereto, and the solution is suitably stirred at the temperature of 70 deg.C and left as it is for 3-5hr. The manganese oxide thus obtained has 20-30Angstrom of grain sizes of platinum grains uniformly distributed over and sticking to the surface thereof, the stuck amount being 1.8% by weight of the manganese oxide. The same is mixed with active carbon, and further mixed with dispersion of polytetrafluoroethylene which offers thereto binding effect and water repellency. The same is then applied to the nickel screen 3 and gets dried, and the gas-diffusion electrode is thus constructed thereby. The button-type air zinc cell using the electrode described above as its anode exhibits much better characteristics in the average comfinuous voltage and net capacity compared with conventional cells. |
