Anode for electrolytic processes
First Claim
1. Dimensionally stable anode for electrochemical reactions characterized in that it comprises an electroconducting body impermeable to aqueous electrolytes and to gases constituted by a thermoformed mixture of graphite particles and inert thermoplastic resin powders having on at least one side thereof an electrocatalytic layer impermeable to aqueous electrolytes and gases consisting of a mixture of inert resin and particles of an oxide of at least one of the metals belonging to the group of ruthenium, iridium, platinum, palladium, rhodium, manganese, cobalt, lead, iron, tin, and nickel, the inert thermoplastic resin of the electroconducting layer forming a homogeneous matrix through the cross-section of the anode whereby the graphite particles of the electroconducting body and the particles of an oxide of the electrocatalytic layer are each fused in a continuous resin matrix, and wherein said thermoplastic resin is capable of being fused to produce a substantially impervious body.
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Accused Products
Abstract
Anodes having a substantially impermeable coating or surface, obtained by moulding under pressure and heat an electrocatalytic layer consisting of a mixture of powders of an electrocatalytic material and inert thermoplastic resin on a conductive body or substrate, consisting of a mixture of powders of graphite and inert resin, resist surprisingly well to the electrochemical attack and offer significant advantages over the much more expensive activated titanium anodes.
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Citations
14 Claims
- 1. Dimensionally stable anode for electrochemical reactions characterized in that it comprises an electroconducting body impermeable to aqueous electrolytes and to gases constituted by a thermoformed mixture of graphite particles and inert thermoplastic resin powders having on at least one side thereof an electrocatalytic layer impermeable to aqueous electrolytes and gases consisting of a mixture of inert resin and particles of an oxide of at least one of the metals belonging to the group of ruthenium, iridium, platinum, palladium, rhodium, manganese, cobalt, lead, iron, tin, and nickel, the inert thermoplastic resin of the electroconducting layer forming a homogeneous matrix through the cross-section of the anode whereby the graphite particles of the electroconducting body and the particles of an oxide of the electrocatalytic layer are each fused in a continuous resin matrix, and wherein said thermoplastic resin is capable of being fused to produce a substantially impervious body.
- 5. An electrolytic cell electrode which comprises a carbon substrate having an electroconductive active substantially impermeable surface portion comprising electroconductive particles having a lower oxygen overvoltage than carbon bonded together by a fused thermoplastic inert fluorocarbon polymer capable of being fused to produce a substantially impervious body.
- 8. A method of electrolyzing an aqueous solution which comprises conducting the electrolysis with at least one electrode comprising an electroconductive carbon substrate having an electroconductive substantially impervious surface comprising electroconductive particles having a lower oxygen overvoltage than carbon bonded together by a fused thermoplastic and inert fluorocarbon polymer capable of being fused to produce a substantially impervious body.
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13. A method of electrolyzing an aqueous electrolyte which comprises conducting the electrolysis in a cell having an anode which is impermeable to aqueous electrolytes and to gases and which comprises an electroconductive substrate comprising electroconductive particles bonded together by a fused thermoplastic resin resistant to the electrolysis and an electroconductive surface layer impermeable to aqueous electrolytes and gases comprising electroconductive particles of oxygen or chlorine overvoltage lower than the particles of the base bonded together by a fused thermoplastic resin resistant to said electrolysis, the volume ratio of resin to conductor being higher in the surface layer than in the substrate and wherein said thermoplastic resin is capable of being fused to produce a substantially impervious body.
Specification