US 4,300,992 A · Activated cathode

Abstract

Activated cathode for use in aqueous solution electrolysis comprises (a) a base plate made of a metal selected from the group consisting of titanium, tantalum, zirconium, niobium or an alloy essentially consisting of combination of those metals and (b) a metal oxide layer formed on the surface of the base plate, said metal oxide essentially consisting of an oxide of one or more metal elements selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum in the groups VIII--5 and VIII--6 of the periodic table and if necessary, (c) an oxide of one or more metal elements selected from the group consisting of calcium, magnesium, strontium, barium and zinc in the group II and chromium, molybdenum, tungsten, selenium and tellurium in the group VI.

Claims12

Dependent claims

An electrolytic cell comprising an activated cathode, an anode and an aqueous solution of an electrolyte, said activated cathode comprising:

(a) a base plate selected from the group consisting of titanium, tantalum, zirconium, niobium and an alloy essentially consisting of a combination of those metals;
(b) an activated layer of at least one metal oxide selected from the group consisting of oxides of a metal element selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum, formed on the surface of the base plate (a);
and
(c) a reduction inhibiting layer of at least one other oxide selected from the group consisting of oxides of an element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, selenium, tellurium, chromium, molybdenum and tungsten formed on the surface of the activated layer of metal oxide (b).

1 more element

Dependencies are inferred from the claim text.

Activated cathode

Life of this patent

Activated cathode

Life of this patent

Abstract

Claims12