| 摘要 |
An improved cathode with a conductive metal core and a Raney-type catalytic surface predominately derived from an adherent ternary aluminide intermetallic crystalline precursory outer portion of the metal core is disclosed. The precursory outer portion contains molybdenum and titanium to give a precursor alloy having the formula NixMoyTizAl3 where x is within the range of from about 75 to about 94 weight percent, y is within the range of from about 5 to about 20 weight percent and z is within the range of from about 1 to about 5 weight percent of the Ni-Mo-Ti portion of the alloy. Also disclosed is a method of producing a low overvoltage cathode which includes the steps of taking a Ni-Mo-Ti core or substrate having about 5-20 weight percentage of Mo and about 1-5 weight percent Ti, coating it with aluminum then heat treating to form a Ni-Mo-Ti-Al tertiary alloy with mostly NiAl3 (ordered orthorhombic) crystal structure. An alkali metal hydroxide is used to leach out Al and produce a ternary Ni-Mo-Ti alloy Raney surface. The resulting ternary alloy-coated substrate is useful as a cathode in electrolytic cells, particularly in membrane cells utilized to produce chlorine and caustic from brine.
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