| 摘要 |
1,164,383. Sintered fuel cell electrodes. ALLMANNA SVENSKA ELEKTRISKA A.B. 11 Jan., 1967 [12 Jan., 1966], No. 1520/67. Heading H1B. [Also in Division C7] Porous sintered electrode material, e.g. for fuel cells, containing Ag as active material is produced from a powdered mixture of a Ag compound or a Mg compound, the Ag compound forming Ag and the Mg compound forming MgO during the sintering, the powdered mixture having been produced by precipitation from a solution containing a Ag salt or a Mg salt. A powder metal carrier such as Fe, Ni, Co, Ti, W, Mo, Ag, or C or their alloys may be added to the powder mixture. The Ag + MgO should amount to 0À1 to 40% by weight and the Mg to 0À1 to 20% by weight of the mixture and up to 25% of ammonium carbonate or bicarbonate may be added as a pore former. PTFE may also be added. The Ag and Mg compounds have a grain size of 0À1-10 microns and the metal powder 1-100 microns. The Ag and Mg compound mixture is precipitated from a nitrate or acetate solution by adding sodium hydroxide or carbonate and sintering is carried out at 150- 700‹ C. without a carrier or at 150-1000‹ C. with a carrier. The powder mixture may be pressed on to a Ni mesh prior to sintering or pressed into electrodes or formed into granules or pellets. The electrodes may be used as oxygen electrodes in alkaline fuel cells. |
