| 摘要 |
A porous matrix for a catalytic fuel cell electrode is made by forming separate raw mixes of porous carbonaceous material and activated carbon, each with a liquid binder, shaping the separate raw mixer into thin flat bodies using a pressure in the range of 105 to 175 kg. per cm.2 gauge, and alternately superimposing layers of the porous carbonaceous material and activated carbon bodies to form a laminated composite body. This body is recompressed using a pressure in the range stated above for a period to ensure the equilibrium of the binder and the intermingling of carbon particles throughout the several interfaces. It is then subjected to baking in a non-oxidizing atmosphere at a temperature in the range of 150 DEG to 250 DEG C. for 12 to 24 hours, the temperature then being gradually raised over 1 to 2 hours to attain a temperature of 1000 DEG C., at which temperature it is held for 30 to 90 minutes, before being allowed to cool at ambient temperature. The activated carbon powder has a specific surface of 800-1000 m2/g. The porous carbonaceous material may be powdered baked carbon having a bulk density of 10.5 g./cc., a porosity of 48% and an average pore diameter of 33 microns and/or powdered graphite having a bulk density of 1.05 g./cc., a porosity of 48%, and an average pore diameter of 140 microns. The liquid binder may be a heavy residual hydrocarbon oil. The porous matrix may be impregnated with catalytic material, e.g. one of the noble metals, e.g. platinum or palladium. |
