| 摘要 |
A porous electrode for a fuel cell is formed of a sintered body of zinc oxide and silver. Copper may also be included in the body. In one example an electrode was produced by mixing the 36-50 mesh BS fraction of a dried powder paste of zinc oxide and silver nitrate with 20 per cent by weight of silver, pressing the mixture at 0.3-0.5 p.s.i., heating slowly to 900 DEG C. to decompose the nitrate and sintering at 900 DEG C. for 1 hour. In another example, zinc oxide powder was presintered at 1000 DEG C. for 2 hours and the mass then broken down and graded. The fraction -150 mesh BS was mixed with 30 per cent silver-copper alloy powder (containing 10 per cent copper) and pressed at 2-3 t.s.i. The fraction -36 + 52 mesh BS was then mixed with same proportion of silver-copper alloy and the coarse grained mixture pressed on top of the fine grained layer and the whole sintered at 1000 DEG C. for 1 hour. In a further example, -150 mesh BS zinc oxide powder was mixed with 25 per cent by weight of -150 mesh BS silver-copper mixture, containing 10 per cent copper, the mixture pressed at 3 t.s.i. and sintered at 1000 DEG C. for 1 hour. The body so formed was broken up and the fraction -36 + 52 mesh BS was pressed at 1.5 t.s.i. and sintered at 1100 DEG C. for 1/2 hour to form an electrode. The fraction -150 + 200 mesh BS may be pressed and sintered with the fraction -36 + 52 mesh BS to form a composite electrode. Specification 806,592 [Group XXXVI] is referred to.ALSO:A porous electrode for a fuel cell is formed of a sintered body of zincoxide and silver. The body should contain at least 1 per cent., preferably 20-50 per cent. of silver and may contain some copper. The electrode may be formed of a coarse grained layer sintered on to a fine grained layer and the fine grained layer may extend completely around the coarse grained layer. Specification 806,592 [Group XXXVI] is referred to. |
