US4116804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytically active porous nickel electrodes
Assignee: EIDP Inc
•
Filing: 1976-11-17
•
Granted: 1978-09-26
•
Expires: 1996-11-17
Abstract
Abstract An improved electrode having a porous nickel surface layer of greater than 75 microns in thickness and at least 11% in porosity is produced by a process which includes interdiffusing aluminum and nickel at a temperature of at least 660° C. to form a nickel-aluminum alloy layer from which aluminum is subsequently selectively dissolved. When used as a cathode in an electrolytic cell for producing hydrogen, chlorine and caustic from brine, the improved electrode exhibits exceptionally low hydrogen overvoltage.
Inventors
- 👤 Christopher Roderick S. Needes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:53
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/98; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1121; B22F3/1134; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
An improved electrode for use as a hydrogen-evolution cathode is an electrolytic cell, the electrode being of the type that has a continuous surface layer of active porous Raney nickel in electrical contact with a conductive metal core, the improvement comprising a porous Raney nickel surface layer having a thickness between 100 and 400 microns, an average porosity of at least 11%, and an average agglomerate size of at least 35 microns.
Claim 2
Dependent Claim
72 words
An improved electrode for use as a hydrogen-evolution cathode is an electrolytic cell, the electrode being of the type that has a continuous surface layer of active porous Raney nickel in electrical contact with a conductive metal core, the improvement comprising a porous Raney nickel surface layer having a thickness between 100 and 400 microns, an average porosity of at least 11%, and an average agglomerate size of at least 35 microns.
Claim 3
Dependent Claim
27 words
The electrode of claim 1, wherein the Raney nickel layer has a porosity between 15 and 25%, and the agglomerate size is between 40 and 400 microns.
Claim 4
Dependent Claim
32 words
The electrode of claim 2, wherein the layer thickness is between 150 and 300 microns, the porosity is between 18 and 22% and the agglomerate size is between 50 and 250 microns.
Claim 5
Dependent Claim
24 words
The electrode of claim 1, wherein the porous Raney nickel has an additional surface coating of nickel of 5 to 10 microns in thickness.
Claim 6
Dependent Claim
17 words
The electrode of claim 1, wherein the core metal contains at least 15 percent by weight nickel.
Claim 7
Dependent Claim
19 words
The electrode of claim 5, wherein the nickel content of the core metal is at least 18 weight percent.
Claim 8
Dependent Claim
13 words
The electrode of claim 6 wherein the core metal is substantially pure nickel.
Claim 9
Dependent Claim
15 words
The electrode of claim 1, wherein the core is in the form of a screen.
References Cited (Backward Citations)
US1263959A
Cited
US1427171A
Cited
US2969315A
Cited
US3441495A
Cited
US3900602A
Cited
US3945907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |