Oxygen electrode and method for preparation thereof
First Claim
1. An oxygen electrode, adapted for use in polarography, galvanometry or amperometry, that is resistant to poisoning and effective for accurate, reproducible current and voltage measurements comprising a conductive sensing member having a working surface which is comprised of a metal that catalyzes the cathodic reduction of oxygen and is adapted to communicate with an oxygen-containing environment for such reduction, a layer of an oxide of said metal at said surface, an insulating jacket covering all of said member except said surface, and a thin polymeric coating over said oxide layer and securely adhered to said surface, said coating comprising a polymer produced by glow discharge polymerization of an aliphatic hydrocarbon and having such properties as to permit reduction of oxygen at said electrode by electrons supplied at said surface through said conductive member.
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Abstract
An oxygen electrode adapted for use for polarographic, galvanometric or amperometric analyses, that is resistant to poisoning and effective for accurate, reproducible current and voltage measurements. The electrode comprises a conductive sensing member having a working surface which is comprised of a metal that catalyzes the cathodic reduction of oxygen and which is adapted to communicate with an oxygen-containing environment for carrying out such reduction. At the working surface is a layer of an oxide of the aforesaid metal. An insulating jacket covers all of the member except the working surface. There is a thin polymeric coating over said oxide layer and securely adhered to the working surface. The coating comprises a polymer produced by glow discharge polymerization of an aliphatic hydrocarbon and has such properties as to permit the reduction of oxygen at the electrode by electrons supplied at the working surface through the conductive member.
A method for preparing the electrode is also disclosed.
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Citations
37 Claims
- 1. An oxygen electrode, adapted for use in polarography, galvanometry or amperometry, that is resistant to poisoning and effective for accurate, reproducible current and voltage measurements comprising a conductive sensing member having a working surface which is comprised of a metal that catalyzes the cathodic reduction of oxygen and is adapted to communicate with an oxygen-containing environment for such reduction, a layer of an oxide of said metal at said surface, an insulating jacket covering all of said member except said surface, and a thin polymeric coating over said oxide layer and securely adhered to said surface, said coating comprising a polymer produced by glow discharge polymerization of an aliphatic hydrocarbon and having such properties as to permit reduction of oxygen at said electrode by electrons supplied at said surface through said conductive member.
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21. A method for producing an oxygen electrode, adapted for use in polarography, galvanometry or amperometry, that is resistant to poisoning and effective for accurate, reproducible current and voltage measurement, the method comprising the steps of:
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generating a plasma from a gas in a low pressure chamber containing the working surface of an oxygen electrode, said electrode comprising a conductive sensing member having a working surface which is comprised of a metal that catalyzes the cathodic reduction of oxygen and is adapted to communicate with an oxygen-containing environment for such reduction, a layer of an oxide of said metal at said surface, and an insulating jacket that covers all of said member except said working surface; introducing an aliphatic hydrocarbon gas into said low pressure chamber; polymerizing said hydrocarbon by action of said plasma thereon; and depositing a thin adherent coating of said polymer over said oxide layer on said working surface. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification