US4049532A
Expired / Lapsed
US
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Electrodes for electrochemical processes
Assignee: Solvay SA
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Filing: 1974-09-23
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Granted: 1977-09-20
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Expires: 1994-09-23
Abstract
Abstract A coating composition for application to an electrically conductive and relatively inert support at least the surface layer of which is titanium or a titanium alloy, to form a coated electrode for electrochemical processes, the composition essentially containing thermally decomposable compounds of iridium and of at least one non noble element selected from the group consisting of lithium, boron, beryllium, magnesium, gallium and germanium, in a liquid vehicle, the atomic ratio of iridium/non noble element being between 1/4 and 8/1. An electrode provided with a coating of this composition exhibits, inter alia, increased service life.
Inventors
- 👤 Lucien Clerbois
- 👤 Louis Degueldre
- 👤 Christian Biver
- 👤 Albert Degols
- 👤 Yves Gobillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:15
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
161 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of a non noble element selected from the group consisting of lithium, boron, beryllium and gallium in an atomic ratio iridium/non noble element of 1/4 to 8/1, said thermally decomposable compound of the non noble element decomposing during the heating of the coating composition to an oxide of the non noble element.
Claim 2
Dependent Claim
161 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of a non noble element selected from the group consisting of lithium, boron, beryllium and gallium in an atomic ratio iridium/non noble element of 1/4 to 8/1, said thermally decomposable compound of the non noble element decomposing during the heating of the coating composition to an oxide of the non noble element.
Claim 3
Dependent Claim
17 words
An electrode as defined in claim 1, wherein the thermally decomposable compound of iridium is hexachloroiridic acid.
Claim 4
Dependent Claim
14 words
An electrode as defined in claim 1, wherein the liquid vehicle is amyl alcohol.
Claim 5
Dependent Claim
14 words
An electrode as defined in claim 1, wherein the liquid vehicle is dimethyl formamide.
Claim 6
Dependent Claim
24 words
An electrode as defined in claim 1, wherein the atomic ratio of iridium/non noble element in said coating composition is between 1/1 and 5/1.
Claim 7
Dependent Claim
43 words
An electrode as defined in claim 1, wherein the non noble element is boron, the thermally decomposable compound of boron is boric acid, the liquid vehicle is amyl alcohol, and the atomic ratio of iridium/boron in said coating composition is greater than 1.
Claim 8
Dependent Claim
62 words
An electrode as defined in claim 1, further comprising an external layer of active material for further increasing the electrocatalytic properties of said electrode, said external layer being on and in contact with said coating and comprising at least one noble metal in its elemental and/or combined state and selected from a group consisting of platinum, palladium, ruthenium, rhodium, osmium and iridium.
Claim 9
Dependent Claim
139 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of lithium, in an atomic ratio iridium/lithium of 1/4 to 8/1, said thermally decomposable compound of lithium decomposing during the heating of the coating composition to an oxide of lithium.
Claim 10
Dependent Claim
139 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of lithium, in an atomic ratio iridium/lithium of 1/4 to 8/1, said thermally decomposable compound of lithium decomposing during the heating of the coating composition to an oxide of lithium.
Claim 11
Dependent Claim
17 words
An electrode as defined in claim 8, wherein the thermally decomposable compound of lithium is lithium nitrate.
Claim 12
Dependent Claim
159 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of a non noble element selected from the group consisting of lithium and boron, in an atomic ratio iridium/non noble element of 1/4 to 8/1, said thermally decomposable compound of the non noble element decomposing during the heating of the coating composition to an oxide of the non noble element.
Claim 13
Dependent Claim
159 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of a non noble element selected from the group consisting of lithium and boron, in an atomic ratio iridium/non noble element of 1/4 to 8/1, said thermally decomposable compound of the non noble element decomposing during the heating of the coating composition to an oxide of the non noble element.
Claim 14
Dependent Claim
139 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of beryllium, in an atomic ratio iridium/beryllium of 1/4 to 8/1, said thermally decomposable compound of beryllium decomposing during the heating of the coating composition to an oxide of beryllium.
Claim 15
Dependent Claim
139 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of beryllium, in an atomic ratio iridium/beryllium of 1/4 to 8/1, said thermally decomposable compound of beryllium decomposing during the heating of the coating composition to an oxide of beryllium.
Claim 16
Dependent Claim
139 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of gallium, in an atomic ratio iridium/gallium of 1/4 to 8/1, said thermally decomposable compound of gallium decomposing during the heating of the coating composition to an oxide of gallium.
Claim 17
Dependent Claim
139 words
In an electrode for electrochemical processes having an electrically conductive and relatively inert support at least the surface layer of which is of titanium or a titanium alloy, and an at least partial coating for said support, said coating being a protective and electrocatalytic layer obtained by heating on said support, in an oxidizing atmosphere at a temperature between 350° and 800° C., a coating composition consisting essentially of at least one thermally decomposable compound of iridium in a liquid vehicle, said iridium compound decomposing during the heating of the coating composition to provide said iridium in a metallic and/or oxide state, and at least one thermally decomposable compound of gallium, in an atomic ratio iridium/gallium of 1/4 to 8/1, said thermally decomposable compound of gallium decomposing during the heating of the coating composition to an oxide of gallium.
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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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |