US4256545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of oxygen electrode preparation and product thereof
Assignee: Dow Chemical Co
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Filing: 1978-09-05
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Granted: 1981-03-17
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Expires: 1998-09-05
Abstract
Abstract Porous electrode bodies are effectively provided with efficient internal surface deposits of manganese oxide(s) catalyst formations by decomposition in an oxidizing atmosphere at an elevated temperature of a pre-applied inorganic permanganate salt reagent (notably potassium permanganate) in order to chemically decompose the reagent to advantageous manganese oxide forms within the body pores. Exposure to a reducing environment after catalyst deposition ameliorates the provided catalyst structure by rendering therein more electrocatalytically active variations of the emplaced manganese oxides. Highly reliable and satisfactory electrode products particularly well suited for use as depolarized cathodes, especially in chlor-alkali cells, are obtained from the treatment.
Inventors
- 👤 Gary A. Deborski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:12
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8825; H01M4/8846; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8892; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/054; H01M4/90; H01M4/9016; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
Method of providing an electrocatalytically active manganese oxide deposit on the interior pore wall surfaces of a porous metallic electrode body comprising: applying a stable, liquid, pyrolyzable, inorganic permanganate salt reagent to and on the interior pore walls of the metallic electrode body; the heating the reagent-bearing electrode in a gaseous oxidizing atmosphere to a temperature of from about 250° C. to about 700° C. until the reagent decomposes to manganese oxide(s) layer deposit formations on said pore walls.
Claim 2
Dependent Claim
79 words
Method of providing an electrocatalytically active manganese oxide deposit on the interior pore wall surfaces of a porous metallic electrode body comprising: applying a stable, liquid, pyrolyzable, inorganic permanganate salt reagent to and on the interior pore walls of the metallic electrode body; the heating the reagent-bearing electrode in a gaseous oxidizing atmosphere to a temperature of from about 250° C. to about 700° C. until the reagent decomposes to manganese oxide(s) layer deposit formations on said pore walls.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the electrode is washed with a peroxide solution after it has been heated.
Claim 4
Independent Claim
13 words
The method of claims 1 or 2 wherein the permanganate is potassium permanganate.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the peroxide is hydrogen peroxide.
Claim 6
Independent Claim
16 words
The method of claims 1 or 2 wherein the electrode is heated to about 250° C.
Claim 7
Independent Claim
18 words
The method of claims 1 or 2 wherein the electrode to be coated is substantially composed of nickel.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the porous electrode has nominal pore size diameters of between about 0.1 to about 12 microns.
Claim 9
Independent Claim
20 words
The method of coating an electrode following the steps of claims 1 or 2 wherein the steps are sequentially repeated.
Claim 10
Dependent Claim
11 words
The electrode produced from the method of claims 1 or 2.
Claim 11
Dependent Claim
9 words
The electrode produced from the method of claim 8.
Claim 12
Dependent Claim
9 words
The electrode produced from the method of claim 7.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |