Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
39 words
An electrochemical cell with an electrode having deposited thereon an electrocatalyst which is a mixed oxide of nickel-molybdenum, nickel-tungsten, cobalt-molybdenum or cobalt-tungsten and containing an aqueous alkaline electrolyte comprising an aqueous solution of a molybdenum, vanadium or tungsten compound.
Claim 2
Dependent Claim
39 words
An electrochemical cell with an electrode having deposited thereon an electrocatalyst which is a mixed oxide of nickel-molybdenum, nickel-tungsten, cobalt-molybdenum or cobalt-tungsten and containing an aqueous alkaline electrolyte comprising an aqueous solution of a molybdenum, vanadium or tungsten compound.
Claim 3
Dependent Claim
17 words
An electrochemical cell according to claim 1 wherein the electrolyte contains an alkali metal hydroxide in solution.
Claim 4
Dependent Claim
24 words
An electrochemical cell according to claim 1 or 2 wherein the molybdenum, vanadium or tungsten compound is added to the electrolyte as an oxide.
Claim 5
Dependent Claim
27 words
An electrochemical cell according to claim 3 wherein the molybdenum, vanadium or tungsten oxide is present in the electrolyte as a molybdate, vanadate or tungstate ion respectively.
Claim 6
Dependent Claim
48 words
An electrochemical cell according to any of the preceding claims wherein the concentration of molybdenum, vanadium or tungsten compound in the electrolyte is between 0.005 and 5 grams per 100 ml of the electrolyte calculated as the trioxide for molybdenum and tungsten and as the pentoxide for vanadium.
Claim 7
Dependent Claim
91 words
An electrochemical cell-according to any of the preceding claims wherein the electrode having the mixed oxide electrocatalyst thereon is'prepared by alternately coating an electrode-core with a compound of nickel or cobalt, and with a compound of molybdenum or tungsten, said compounds being capable of thermal decomposition to the corresponding oxides, heating the coated core at an elevated temperature to form a layer of the mixed oxides on the core and finally curing the core with the mixed oxide layer thereon in a reducing atmosphere at a temperature between 350°C and 600°C.
Claim 8
Dependent Claim
24 words
An electrochemical cell according to claim 6 wherein the electrode core covered with a layer of mixed oxides is cured between 450° and 600°C.
Claim 9
Dependent Claim
24 words
An electrochemical cell according to claim 6 or 7 wherein the curing is carried out in an atmosphere of pure hydrogen at atmospheric pressure.
Claim 10
Dependent Claim
25 words
An electrochemical cell according to any of the preceding claims wherein the electrode has an electrocatalyst loading of between 10 and 100 mg/cm 2 .
Claim 11
Dependent Claim
19 words
An electrochemical cell according to any of the preceding claims for use in the electrolysis of water or brine.