Cathode for chlor-alkali cells

Details Cathode for chlor-alkali cells Cathode for chlor-alkali cells

1981-12-09

1983-05-24

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 204252, 204290R, 204290F, 204293, C25B 134, C25B 1106, C25B 1110

Patent

active

043849326

ABSTRACT:
An improved cathode with a conductive metal core and a Raney nickel type catalytic surface predominantly derived from an adherent Beta (NiAl.sub.3) crystalline precursory outer portion of the metal core is disclosed. The precursory outer portion contains nickel, tantalum, and aluminum to give a precursor alloy having the formula (NiTa)Al.sub.3 where the tantalum content of the nickel-tantalum portion is in the range of from about 5 to about 25 weight percent. Also disclosed is a method of producing a low overvoltage cathode which includes the steps of coating a nickel-tantalum core or substrate having from about 5 to about 25 percent by weight of tantalum with molten aluminum and heat treating the coated substrate to form a (NiTa)Al.sub.3 ternary alloy with predominantly a Beta crystal structure on the outer portion. An alkali metal hydroxide is used to leach out aluminum and produce a porous binary Raney Ni-Ta alloy surface. The resulting porous binary alloy-coated substrate is useful as a cathode in electrolytic cells, particularly in membrane cells utilized to produce chlorine and caustic from brine.

REFERENCES:
patent: 4049841 (1977-09-01), Coker et al.
patent: 4116804 (1978-09-01), Needes
patent: 4169025 (1979-09-01), Needes
patent: 4240895 (1980-12-01), Gray
patent: 4248680 (1981-02-01), Carlin et al.
patent: 4251478 (1981-02-01), Welch et al.

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