US4426269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stabilizing electrodes coated with mixed oxide electrocatalysts during use in electrochemical cells
Assignee: BP PLC
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Filing: 1979-03-05
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Granted: 1984-01-17
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Expires: 1999-03-05
Abstract
Abstract An electrochemical cell with an electrode having deposited thereon an electrocatalyst which is a mixed oxide of nickel-molydenum, nickel-tungsten, cobalt-molydenum or cobalt-tungsten and containing an aqueous alkaline electrolyte comprising an aqueous solution of a molybdenum, vanadium or tungsten compound. The electrodes are preferably prepared by alternately coating an electrode core with a compound of nickel or cobalt, and with a compound of molydenum or tungsten, said compounds being capable of thermal decomposition to the corresponding oxides, heating the coated core at an elevated temperature to form a layer of the mixed oxides on the core and finally curing the core with the mixed oxide layer thereon in a reducing atmosphere at a temperature between 350° C. and 600° C. The cells are particularly suitable for use in 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
2026-11-07 20:22
CPC Classifications
C; C25; C25B; C25B15/00; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/077; C25B11/091
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
An electrochemical cell comprising: (i) an electrode having an electrocatalyst composition on a surface of the electrode, said electrocatalyst comprising a mixed oxide of nickel-molybdenum, nickel-tungsten, cobalt-molybdenum or cobalt-tungsten, and (ii) an electrolyte composition comprising an alkaline aqueous solution of a molybdenum, vanadium or tungsten compound.
Claim 2
Dependent Claim
46 words
An electrochemical cell comprising: (i) an electrode having an electrocatalyst composition on a surface of the electrode, said electrocatalyst comprising a mixed oxide of nickel-molybdenum, nickel-tungsten, cobalt-molybdenum or cobalt-tungsten, and (ii) an electrolyte composition comprising an alkaline aqueous solution of a molybdenum, vanadium or tungsten compound.
Claim 3
Dependent Claim
17 words
An electrochemical cell according to claim 1 wherein the electrolyte contains an alkali metal hydroxide in solution.
Claim 4
Dependent Claim
22 words
An electrochemical cell according to claim 1 wherein the molybdenum, vanadium or tungsten compound is added to the electrolyte as an oxide.
Claim 5
Dependent Claim
27 words
An electrochemical cell according to claim 3 wherein the molybdenum, vanadium or tungsten oxide is present in the electrolyte as a molybdate, vanadate or tungstate ion respectively.
Claim 6
Dependent Claim
31 words
An electrochemical cell according to claim 1 wherein the concentration of molybdenum, vanadium or tungsten compound in the electrolyte is between 0.005 and 5 grams per 100 ml of the electrolyte.
Claim 7
Dependent Claim
93 words
An electrochemical cell according to claim 1 wherein the electrode having the mixed oxide electrocatalyst thereon is prepared by alternately coating an electrode core with a compound of nickel or cobalt and with a compound of molybdenum or tungsten, said compounds being capable of thermal decomposition to the corresponding oxides, heating the coated core at an elevated temperature to form a layer of the mixed oxides on the core and finally curing the core with the mixed oxide layer thereon in a reducing atmosphere at a temperature between 350° C. and 600° C.
Claim 8
Dependent Claim
26 words
An electrochemical cell according to claim 6 wherein the electrode core covered with a layer of mixed oxides is cured between 450° C. and 600° C.
Claim 9
Dependent Claim
22 words
An electrochemical cell according to claim 6 wherein the curing is carried out in an atmosphere of pure hydrogen at atmospheric pressure.
Claim 10
Dependent Claim
22 words
An electrochemical cell according to claim 1 wherein the electrode has an electrocatalyst loading of between 10 and 100 mg/cm 2 .
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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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |