US4358475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing active electrodes
Assignee: BP PLC
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Filing: 1981-03-11
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Granted: 1982-11-09
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Expires: 2001-03-11
Abstract
Abstract This invention relates to a method of producing metal electrodes by treating a metal electrode substrate so as to coat the substrate surface with a homogeneous solution of the compounds of (i) at least one metal selected from a first group of iron, cobalt, nickel and manganese (ii) at least one other metal selected from a second group of molybdenum, tungsten and vanadium, each of which compound is capable of thermal decomposition to the corresponding metal oxide. The coated substrate is then thermally decomposed and the oxide-coated substrate is cured in a reducing atmosphere at elevated temperature. Substrates coated with Ni-Mo oxides are preferred. The electrodes thus produced exhibit very low overvoltage, are of high stability with respect to their activity and can be used as cathodes for the electrolysis of water or brine.
Inventors
- 👤 David E. Brown
- 👤 Mahmood N. Mahmood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:56
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A method of producing metal electrodes comprising treating a metal electrode substrate so as to coat the substrate surface with a homogeneous solution of the compounds of (i) at least one metal selected from a first group of iron, cobalt, nickel and manganese (ii) at least one other metal selected from a second group of molybdenum, tungsten and vanadium, each of which compound, when not an oxide, is capable of thermal decomposition to the corresponding metal oxide, thermally decomposing the metal compounds, other than the oxides, on the substrate to the corresponding oxides or mixed oxides and curing the oxide-coated substrate in a reducing atmosphere at elevated temperature so as to convert at least some of the oxides to a metallic state.
Claim 2
Independent Claim
122 words
A method of producing metal electrodes comprising treating a metal electrode substrate so as to coat the substrate surface with a homogeneous solution of the compounds of (i) at least one metal selected from a first group of iron, cobalt, nickel and manganese (ii) at least one other metal selected from a second group of molybdenum, tungsten and vanadium, each of which compound, when not an oxide, is capable of thermal decomposition to the corresponding metal oxide, thermally decomposing the metal compounds, other than the oxides, on the substrate to the corresponding oxides or mixed oxides and curing the oxide-coated substrate in a reducing atmosphere at elevated temperature so as to convert at least some of the oxides to a metallic state.
Claim 3
Dependent Claim
76 words
A method of producing metal electrodes according to claim 1 comprising treating a metal electrode substrate so as to coat the substrate surface with a homogeneous solution of a nickel compound and a molybdenum compound both of which are capable of thermal decomposition to the corresponding oxides, thermally decomposing the metal compounds on the substrates surface to the corresponding oxides or mixed oxides, and subsequently curing the oxide-coated substrate in a reducing atmosphere at elevated temperature.
Claim 4
Dependent Claim
34 words
A process according to claim 1 wherein the metal electrode substrate on which the coating is carried out is selected from nickel, iron, copper, titanium, and alloys thereof, and other metallic substances plated therewith.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein the homogeneous solution of the metal compounds is a liquid and comprises a solution of the metal compounds in an aqueous solvent.
Claim 6
Dependent Claim
21 words
A method according to claim 4 wherein ammonia is added to the aqueous solution to maintain the homogeneity of the solution.
Claim 7
Dependent Claim
23 words
A method according to claim 1 wherein the homogeneous solution is applied to the substrate surface by dipping, spraying, brushing or by plating.
Claim 8
Dependent Claim
30 words
A method according to claim 1 wherein the coated substrate surface is heated to a temperature between 250° and 1200° C. to decompose the metal compounds to the corresponding oxides.
Claim 9
Dependent Claim
34 words
A method according to claim 1 wherein the homogeneous solution of the metal compound comprises an intimate mixture of the respective solid metal compounds in their finely divided state or a solid solution thereof.
Claim 10
Dependent Claim
17 words
A method according to claim 8 wherein each of the metal compounds are the respective metal oxides.
Claim 11
Dependent Claim
34 words
A method according to claim 1 wherein the homogeneous solution is applied to the substrate surface by a melt spraying technique which is selected from the group consisting of flame spraying and plasma spraying.
Claim 12
Dependent Claim
32 words
A method according to claim 1 wherein the substrate surface coated with the metal oxide is cured by heating in an atmosphere of hydrogen at a temperature between 250° and 700° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |