US4213843A
Expired / Lapsed
US
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Electrolysis electrodes and method of making same
Assignee: De Nora Permelec Ltd
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Filing: 1979-03-09
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Granted: 1980-07-22
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Expires: 1999-03-09
Abstract
Abstract An electrode for use in electrolysis of an aqueous solution of a metal halide such as an alkali metal or alkaline earth metal halide comprising: (1) an electroconductive substrate, such as of titanium; and (2) a coating on the substrate, where the coating comprises: (a) 5 to 75 mole percent of iridium oxide; (b) 5 to 70 mole percent of at least one metal oxide selected from the group consisting of oxides of titanium, tantalum and niobium; and (c) 20 to 70 mole percent of at least one of a member selected from the group consisting of tin oxide and cobalt oxide, with the sum of the mole percent of the iridium oxide (a) plus the mole percent of the metal oxide (b) being at least 30 mole percent, and a method of making the same.
Inventors
- 👤 Hideo Sato
- 👤 Takayuki Shimamune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:42
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
An electrode for use in electrolysis of an aqueous solution of a metal halide comprising: (a) an electroconductive substrate; and (b) a coating on said substrate, said coating consisting essentially of: (i) 5 to 75 mole percent of iridium oxide; (ii) 5 to 70 mole percent of at least one metal oxide selected from the group consisting of oxides of titanium, tantalum and niobium, and (iii) 20 to 70 mole percent of at least one of a member selected from the group consisting of tin oxide and cobalt oxide, with the sum of the mole percent of the iridium oxide (i) plus the mole percent of the metal oxide (ii) being at least 30 mole percent.
Claim 2
Dependent Claim
116 words
An electrode for use in electrolysis of an aqueous solution of a metal halide comprising: (a) an electroconductive substrate; and (b) a coating on said substrate, said coating consisting essentially of: (i) 5 to 75 mole percent of iridium oxide; (ii) 5 to 70 mole percent of at least one metal oxide selected from the group consisting of oxides of titanium, tantalum and niobium, and (iii) 20 to 70 mole percent of at least one of a member selected from the group consisting of tin oxide and cobalt oxide, with the sum of the mole percent of the iridium oxide (i) plus the mole percent of the metal oxide (ii) being at least 30 mole percent.
Claim 3
Dependent Claim
39 words
The electrode according to claim 1, wherein said coating (b) comprises: (i) 5 to 75 mole percent of iridium oxide; (ii) 5 to 70 mole percent of titanium oxide; and (iii) 20 to 70 mole percent of tin oxide.
Claim 4
Dependent Claim
19 words
The electrode according to claim 2, wherein said coating (b) consists essentially of said components (i), (ii) and (iii).
Claim 5
Dependent Claim
32 words
The electrode according to claim 1, wherein the electroconductive substrate is a substrate of titanium, tantalum, niobium, zirconium or hafnium or an alloy consisting predominantly of titanium, tantalum, niobium, zirconium or hafnium.
Claim 6
Independent Claim
181 words
A method of making an electrode for use in electrolysis of an aqueous solution of a metal halide which comprises: (a) applying a solution containing: (i) an iridium compound; (ii) at least one metal compound selected from the group consisting of compounds of titanium, tantalum and niobium; and (iii) at least one of a member selected from the group consisting of a tin compound and a cobalt compound to an electroconductive substrate; and (b) thermally treating said coated electroconductive substrate in an oxidizing atmosphere to form on the electroconductive substrate an oxide coating consisting essentially of (i) 5 to 75 mole percent of iridium oxide; (ii) 5 to 70 mole percent of at least one metal oxide selected from the group consisting of oxides of titanium, tantalum and niobium; and (iii) 20 to 70 mole percent of at least one of a member selected from the group consisting of tin oxide and cobalt oxide, with the sum of the mole percent of the iridium oxide (i) plus the mole percent of the metal oxide (ii) being at least 30 mole percent.
Claim 7
Independent Claim
181 words
A method of making an electrode for use in electrolysis of an aqueous solution of a metal halide which comprises: (a) applying a solution containing: (i) an iridium compound; (ii) at least one metal compound selected from the group consisting of compounds of titanium, tantalum and niobium; and (iii) at least one of a member selected from the group consisting of a tin compound and a cobalt compound to an electroconductive substrate; and (b) thermally treating said coated electroconductive substrate in an oxidizing atmosphere to form on the electroconductive substrate an oxide coating consisting essentially of (i) 5 to 75 mole percent of iridium oxide; (ii) 5 to 70 mole percent of at least one metal oxide selected from the group consisting of oxides of titanium, tantalum and niobium; and (iii) 20 to 70 mole percent of at least one of a member selected from the group consisting of tin oxide and cobalt oxide, with the sum of the mole percent of the iridium oxide (i) plus the mole percent of the metal oxide (ii) being at least 30 mole percent.
Claim 8
Dependent Claim
22 words
The method of making an electrode according to claim 5, wherein said compounds (i), (ii) and (iii) in said solution are chlorides.
Claim 9
Dependent Claim
35 words
The method of making an electrode according to claim 5 or 6, wherein the thermal treatment is conducted in an oxidizing atmosphere in which the oxygen partial pressure is about 0.1 to about 0.5 atm.
Claim 10
Dependent Claim
27 words
The method of making an electrode according to claim 5 or 6, wherein the thermal treating is at a temperature of about 350 to about 650° C.
Claim 11
Dependent Claim
25 words
The method of making an electrode according to claim 7, wherein the thermal treating is at a temperature of about 350° to about 650° 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) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |