US4765879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable electrodes for electrolysis and process for producing the same
Assignee: De Nora Permelec Ltd
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Filing: 1987-06-02
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Granted: 1988-08-23
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Expires: 2007-06-02
Abstract
Abstract An electrode for electrolysis which comprises an electrode substrate made of a conductive metal having thereon a coating of an electrode active substance is disclosed, in which a first intermediate layer comprising at least one compound of rare earth element and a second intermediate layer containing at least one of base metals and base metal oxides are provided between said electrode substrate and electrode active substance coating. The electrode exhibits high resistance to passivation and excellent durability, and is particularly suitable for use in electrolysis accompanied by oxygen generation and for organic electrolysis.
Inventors
- 👤 Yukiei Matsumoto
- 👤 Takayuki Shimamune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:52
CPC Classifications
C; C25; C25B; C25B11/00; C25C; C25C7/00; C25C7/02; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
An electrode for electrolysis comprising an electrode substrate made of a conductive metal having coated thereupon: a first intermediate layer comprised of at least one compound of rare earth element; a second intermediate layer containing at least one of base metals and base metal oxides; and on the substrate having the first and second intermediate layers, a coating of electrode active substance with electrochemical activities containing of a platinum group metal or an oxide thereof.
Claim 2
Dependent Claim
75 words
An electrode for electrolysis comprising an electrode substrate made of a conductive metal having coated thereupon: a first intermediate layer comprised of at least one compound of rare earth element; a second intermediate layer containing at least one of base metals and base metal oxides; and on the substrate having the first and second intermediate layers, a coating of electrode active substance with electrochemical activities containing of a platinum group metal or an oxide thereof.
Claim 3
Dependent Claim
30 words
An electrode for electrolysis as in claim 1, wherein said conductive metal is selected from the group consisting of Ti, Ta, Nb, Zr, and an alloy based on said metals.
Claim 4
Dependent Claim
25 words
An electrode for electrolysis as in claim 1, wherein said electrode substrate is a conductive metal having been subjected to nitriding, boriding, or carbiding treatment.
Claim 5
Dependent Claim
37 words
An electrode for electrolysis as in claim 1, wherein said compound of rare earth element is an oxide or oxyhalide of a metal selected from the group consisting of Sc, Y, La, Ce, Nd, Sm, and Gd.
Claim 6
Dependent Claim
42 words
An electrode for electrolysis as in claim 1, wherein said base metal or oxide thereof is selected from the group consisting of Ti, Ta, Nb, Zr, Hf, W, V, Al, Si, Sn, Pb, Bi, Sb, Ge, In, Ga, Fe, Mo, Mn, and
Claim 7
Dependent Claim
78 words
A process for producing an electrode for electrolysis which comprises coating an electrode substrate made of a conductive metal with a first intermediate layer comprised of at least one compound of rare earth element; a second intermediate layer containing at least one of base metals and base metal oxides; and on the substrate having the first and second intermediate layers, a coating of electrode active substance with electrochemical activities containing a platinum group metal or an oxide thereof.
Claim 8
Dependent Claim
78 words
A process for producing an electrode for electrolysis which comprises coating an electrode substrate made of a conductive metal with a first intermediate layer comprised of at least one compound of rare earth element; a second intermediate layer containing at least one of base metals and base metal oxides; and on the substrate having the first and second intermediate layers, a coating of electrode active substance with electrochemical activities containing a platinum group metal or an oxide thereof.
Claim 9
Dependent Claim
28 words
A process as in claim 6, wherein said conductive metal is selected from the group consisting of Ti, Ta, Nb, Zr, and an alloy based on said metals.
Claim 10
Dependent Claim
22 words
A process as in claim 6, wherein said electrode substrate is conductive metal having been subjected to nitriding, boriding, or carbiding treatment.
Claim 11
Dependent Claim
29 words
A process as in claim 6, wherein said coating of the first intermediate layer, the second intermediate layer, or the electrode active substance is carried out by thermal decomposition.
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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |