US4223049A
Expired / Lapsed
US
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Superficially mixed metal oxide electrodes
Assignee: University of North Carolina at Chapel Hill
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Filing: 1978-05-23
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Granted: 1980-09-16
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Expires: 1998-05-23
Abstract
Abstract A superficially mixed metal oxide electrode and a method of preparing same. The electrode is useful in anodic electrochemical reactions. There is no distinct outer layer of either noble metal or noble metal oxide. Instead, the noble metal or noble metal oxide is superficially mixed in with a layer of an oxide of a film-forming metal which has been deposited over a conductive base metal.
Inventors
- 👤 Royce W. Murray
- 👤 P. R. Moses
- 👤 Larry Wier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:37
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
122 words
Process for making a superficially mixed metal oxide electrode comprising the steps of: (a) coating a conductive base metal with an oxide of a film-forming metal to form a metal oxide electrode, (b) immersing said metal oxide electrode of step (a) in a suitable solvent solution of a coordinately reactive salt of a noble metal, said metal having the ability to form an electrically conducting oxide, (c) removing said metal/oxide electrode from said solvent solution of step (b) and washing said metal oxide electrode with distilled water or other suitable solvent, whereby any separate and distinct outer noble metal salt layer formed by said immersion has been removed, and (d) heating said metal oxide electrode to form a superficially mixed oxide electrode.
Claim 2
Dependent Claim
122 words
Process for making a superficially mixed metal oxide electrode comprising the steps of: (a) coating a conductive base metal with an oxide of a film-forming metal to form a metal oxide electrode, (b) immersing said metal oxide electrode of step (a) in a suitable solvent solution of a coordinately reactive salt of a noble metal, said metal having the ability to form an electrically conducting oxide, (c) removing said metal/oxide electrode from said solvent solution of step (b) and washing said metal oxide electrode with distilled water or other suitable solvent, whereby any separate and distinct outer noble metal salt layer formed by said immersion has been removed, and (d) heating said metal oxide electrode to form a superficially mixed oxide electrode.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein steps (b), (c) and (d) are sequentially repeated a plurality of times.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the conductive base metal is titanium.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein the conductive base metal is titanium.
Claim 6
Dependent Claim
26 words
The process of claim 3 wherein the titanium is coated in step (a) with an oxide selected from conductive tin oxide, titanium oxide, and mixtures thereof.
Claim 7
Dependent Claim
26 words
The process of claim 4 wherein the titanium is coated in step (a) with an oxide selected from conductive tin oxide, titanium oxide, and mixtures thereof.
Claim 8
Dependent Claim
27 words
The process of claim 5 wherein the coordinatively reactive salt of a metal is selected from ruthenium trichloride, iridium trichloride, platinum trichloride, rhodium trichloride and mixtures thereof.
Claim 9
Dependent Claim
27 words
The process of claim 6 wherein the coordinatively reactive salt of a metal is selected from ruthenium trichloride, iridium trichloride, platinum trichloride, rhodium trichloride, and mixtures thereof.
Claim 10
Dependent Claim
18 words
The process in accordance with claim 1 wherein the solvent solution of step (b) is an aqueous solution.
Claim 11
Dependent Claim
88 words
Process for making a superficially mixed metal oxide electrode comprising the steps of: (a) coating a titanium electrode with a conductive tin oxide, (b) immersing the coated titanium electrode of step (a) in an aqueous solution of ruthenium trichloride, (c) removing the immersed coated titanium electrode and washing said coated titanium electrode with distilled water, whereby any separate and distinct outer layer of ruthenium trichloride formed by said immersion has been removed, and (d) heating the washed coated titanium electrode to form a superficially mixed metal oxide electrode.
Claim 12
Dependent Claim
88 words
Process for making a superficially mixed metal oxide electrode comprising the steps of: (a) coating a titanium electrode with a conductive tin oxide, (b) immersing the coated titanium electrode of step (a) in an aqueous solution of ruthenium trichloride, (c) removing the immersed coated titanium electrode and washing said coated titanium electrode with distilled water, whereby any separate and distinct outer layer of ruthenium trichloride formed by said immersion has been removed, and (d) heating the washed coated titanium electrode to form a superficially mixed metal oxide electrode.
Claim 13
Dependent Claim
19 words
The process of claim 10 wherein the titanium electrode of step (a) is coated with a conductive titanium oxide.
Claim 14
Dependent Claim
20 words
The process of claim 10 or 11 wherein steps (b), (c) and (d) are sequentially repeated a plurality of times.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |