| 摘要 |
1487485 Fuel cell electrodes SIEMENS AG 21 Jan 1975 [5 Feb 1974] 2661/75 Heading H1B A method of forming a catalytic layer suitable for use as an electrode comprises providing a layer of homogeneous alloy consisting of a first component comprising at least one metal selected from Ru, Rh, Pd, Os, Ir and Pt, a second component comprising at least one metal selected from Fe, Co and Ni, the alloy initially comprising at least 65 atom per cent of the second component, and removing second component from the alloy to form the desired catalytic layer. The platinum group metals may be doped with Bo, Si, Ti, Zr, Nb, Ta, Mo and/or W, Cu and/or Av. The removal of the inactive second component is achieved by etching the alloy with HNO 3 , H 2 SO 4 or HCl at room temperature to form the microporous catalyst layer. Alternatively the inactive component is removed electrochemically. In a modification a Pt/Ni foil is sintered to each side of a Pt foil, the Pt/Ni foils then being treated to form the catalyst layers. The electrodes may be used in fuel cells in which glucose is oxidized to provide power for operating an artificial heart or in methanol-air fuel cells. |
