Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
An electrode for use in electrolytic processes having a substrate of film-forming metal comprising an electrolcatalyst incorporated in an integral surface film of the film-forming metal oxide grown from the substrate, said electrocatalyst comprising at least one platinum-group metal and platinum-group metal oxide, characterized in that the electrocatalyst in the surface film comprises two superimposed layers, a first layer comprising platinum metal and a second layer comprising an oxide of iridium, rhodium, palladium, or ruthenium, the first platinum containing layer being next to the substrate and the second iridium, rhodium, palladium or ruthenium oxide containing layer coforming the outer surface of the integral surface film with the film-forming metal oxide.
Claim 2
Dependent Claim
110 words
An electrode for use in electrolytic processes having a substrate of film-forming metal comprising an electrolcatalyst incorporated in an integral surface film of the film-forming metal oxide grown from the substrate, said electrocatalyst comprising at least one platinum-group metal and platinum-group metal oxide, characterized in that the electrocatalyst in the surface film comprises two superimposed layers, a first layer comprising platinum metal and a second layer comprising an oxide of iridium, rhodium, palladium, or ruthenium, the first platinum containing layer being next to the substrate and the second iridium, rhodium, palladium or ruthenium oxide containing layer coforming the outer surface of the integral surface film with the film-forming metal oxide.
Claim 3
Dependent Claim
32 words
The electrode according to claim l, characterized in that the first platinum metal comprising layer and the second iridium oxide, rhodium oxide, palladium oxide or ruthenium oxide containing layer are partially interdiffused.
Claim 4
Dependent Claim
22 words
The electrode according to claim l or 2, characterized in that the first layer comprises 0.8 to l.8 g/m² of platinum metal.
Claim 5
Dependent Claim
32 words
The electrode according to claim l, 2 or 3, characterized in that the second layer comprises 2 to 4 g/m² of the oxide of iridium, rhodium, palladium or ruthenium (calculated as metal).
Claim 6
Dependent Claim
53 words
The electrode according to claims l to 4, characterized in that the film-forming metal oxide is titanium oxide grown from a titanium substrate and the oxide in the second layer is iridium oxide, at least a major part of said titanium oxide and said iridium oxide being in the form of solid solution.
Claim 7
Dependent Claim
30 words
The electrode according to claim 5, characterized in that the molar ratio of platinum metal to iridium oxide in the surface film is between l:l and l:6 (calculated as metal).
Claim 8
Dependent Claim
30 words
The electrode according to claims l to 6, characterized in that the surface film comprising the two superimposed layers serves as an underlayer for another electrochemically active catalytic outer layer.
Claim 9
Dependent Claim
31 words
Use of the electrode according to any one of claims l to 7, as an oxygen evolving anode at current densities over 3.5 kA per m² of the projected anode surface.
Claim 10
Dependent Claim
16 words
Use of the electrode according to claim 8, as an anode in high speed electroplating (electrogalvanizing).