Novel cathode and bipolar electrode incorporating the same
First Claim
1. A hydrogen-evolution cathode for electrochemical reactions, comprising a body which is substantially impervious to the diffusion therethrough of atomic hydrogen, said body being formed of an aggregate of powdered electrically conductive material embedded in electrically conducting relationship in a cured thermosetting resin and having a cathodically active surface enriched with a powder of a hydrogen evolution catalyst.
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Abstract
A hydrogen evolution cathode for electrochemical reactions consists of a body formed of a powdered electrically conductive material embedded in a cured thermosetting resin and having a cathodically operative surface enriched with powder of a hydrogen evolution catalyst, the powdered conductive material preventing the diffusion of atomic hydrogen through the cathode body. The cathode may be incorporated in a bipolar electrode by bonding it to a thin sheet of valve metal coated with an anodic electrocatalytic material, the body being advantageously extended by projecting parts of electrically insulating cured resin.
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Citations
20 Claims
- 1. A hydrogen-evolution cathode for electrochemical reactions, comprising a body which is substantially impervious to the diffusion therethrough of atomic hydrogen, said body being formed of an aggregate of powdered electrically conductive material embedded in electrically conducting relationship in a cured thermosetting resin and having a cathodically active surface enriched with a powder of a hydrogen evolution catalyst.
- 9. A bipolar electrode for electrochemical reactions involving cathodic hydrogen evolution, comprising a valve metal anode having an anodically active surface coated over with a layer of an electrocatalytic anodically resistant material and a cathode bonded to the anode in electrically conducting relationship, the cathode comprising a body which is substantially impervious to the diffusion therethrough of atomic hydrogen, said body being formed of powdered electrically conductive material embedded in electrically conducting relationship in a cured thermosetting resin and having a cathodically active surface enriched with a powder of hydrogen evolution catalyst.
- 13. A bipolar electrode for electrochemical reactions involving cathodic hydrogen evolution in bipolar diaphragm-less electrolyzers, comprising a substantially planar valve metal anode having an anodically active surface coated over with a layer of an electrocatalytic anodically resistant material and a cathode bonded to the anode in electrically conducting relationship, the cathode comprising a body which is substantially impervious to the diffusion therethrough of atomic hydrogen, said body being formed of an aggregate of powdered electrically conductive material embedded in electrically conducting relationship in a cured thermosetting resin and having a cathodically active surface enriched with a powder of a hydrogen evolution catalyst, said body being extended beyond at least one edge of the cathode and the active surface of the anode by at least one part of cured electrically insulating resin.
- 15. In a cell for electrochemical reactions involving cathodic hydrogen evolution, comprising a housing and co-operating electrodes disposed in said housing to provide means for the passage of an electrolyte through the cell, the improvement in which said electrodes operating as cathodes each comprise a body which is substantially impervious to the diffusion of hydrogen, said body being formed of an aggregrate of powdered electrically conductive material embedded in electrically conducting relationship in a cured thermosetting resin and having a cathodically active surface enriched with a powder of a hydrogen evolution catalyst.
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20. In a method of electrolysis wherein hydrogen is evolved at a cathodically polarized electrode, the improvement comprising using as the cathodically polarized electrode a body formed of an aggregate of powdered electrically conductive material embedded in electrically conducting relationship in a cured thermosetting resin and having a cathodically active surface enriched with a powder of a hydrogen evolution catalyst whereby atomic hydrogen evolved at the cathodically active surface is substantially prevented from diffusing through said body.
Specification