Cathode for chlor-alkali cells

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

1979-10-01

1981-09-15

Edmundson, F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

204 37R, 204290R, 204293, 252477Q, H01M 488, C25B 1106, C25D 550

Patent

active

042896509

ABSTRACT:
An improved cathode with a conductive metal core and a Raney-type catalytic surface predominantly derived from an adherent ternary aluminide intermetallic crystalline precursory outer portion of the metal core is disclosed. The precursory outer portion preferably has molybdenum and titanium added to give a precursor alloy having the formula Ni.sub.x Mo.sub.y Ti.sub.z Al.sub.3 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. The method 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 and coating it with aluminum then heat treating to form a Ni-Mo-Ti-Al ternary alloy with mostly NiAl.sub.3 (ordered orthorhombic) crystal structure and then leaching out the Al to produce a ternary NiMoTi alloy Raney surface.

REFERENCES:
patent: 3674710 (1972-07-01), Richter et al.
patent: 3846344 (1974-11-01), Larson et al.
patent: 4116804 (1978-09-01), Needes
patent: 4153578 (1979-05-01), Thomas et al.
patent: 4162204 (1979-07-01), Kuo

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