Laminated electrode the use thereof
AssigneeW. C. Heraeus GmbH
InventorsChristina Modes, Heinrich Meyer, Jochen-Werner K. Burgsdorff, Ulrich Stroder, Andrea Kramer
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Abstract
Laminated electrodes and a method for their preparation are described, these electrodes being composed of electrically conductive plastic having catalytic particles, composed of a catalyst deposited on supporting particles, pressed partially into the plastic. They can be used as oxygen anodes, for example in the electrolytic recovery of metal from aqueous solutions.
Claims20
In an electrochemical cell comprising an anode coupled to means for supplying a positive potential thereto and a cathode coupled to means for supplying a negative potential thereto, for use in an electrochemcial reaction of the type wherein the anode and the cathode project into an electrolyte, and electricity flows therebetween and through the electrolyte, the electrochemical reaction being of the type wherein oxygen is released at the anode, the release of oxygen normally requiring an overpotential to be applied, wherein
- the improvement comprises means for reducing the oxygen overpotential comprising an anode comprising an electrically conductive base body comprising electrically conductive plastic, which contains carbon black only in the range of 7.5-25% by weight with a particle size under 0.02 microns;
- and partially embedded in said base body, catalytic particles comprising one or more catalysts applied to supporting particles.
Method of using an oxygen-evolving laminated anode comprising an electrically conductive base body comprising electrically conductive plastic, which contains carbon black only in the range of 7.5-25% by weight with a particle size under 0.02 microns;
- and partially embedded in said base body, catalytic particles comprising one or more catalysts applied to supporting particles, the method of using the oxygen-evolving laminated anode comprising:
- electrowinning metal from an aqueous acid electrolyte solution containing dissolved metal therein in an electrolysis cell containing a cathode, said anode and means to pass an electrolysis current through said cell between the anode and the cathode, by passing an electrolysis current through said cell to release oxygen at said anode and deposit dissolved metal from said solution on the cathode.
Method of using an oxygen-evolving laminated anode comprising an electrically conductive base body comprising electrically conductive plastic, which contains carbon black only in the range of 7.5-25% by weight with a particle size under 0.02 microns;
- and partially embedded in said base body, catalytic particles comprising one or more catalysts applied to supporting particles, the method of using the oxygen-evolving laminated anode comprising:
- electroplating metal onto an electrically conductive substrate by providing said substrate and said anode in contact with an aqueous acid electrolytic metal plating bath and by passing an electric current through said plating bath in a direction to make said substrate a cathode and to release oxygen at said anode.
Dependencies are inferred from the claim text.