US4132619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocatalyst
Assignee: Scientific Research Foundation
•
Filing: 1977-08-02
•
Granted: 1979-01-02
•
Expires: 1997-08-02
Abstract
Abstract The invention relates to mixed oxides of the spinel type or of similar structure, containing a quantity of boron adapted to reduce the electrical resistance of the oxide by a factor of at least 1000 calculated on the corresponding compound without boron, some of the preferred compounds being selected from compounds of the formulae CoxFe3-xOn and CoxNi3-xOn, wherein x is between 0.05 and 3, n is between 3 and 5, containing from 0.05 to 20 atom per cent boron calculated on the mixed oxides, wherein part of the Co,Ni. or Fe may be substituted by an equivalent quantity of magnesium or calcium, said compounds being optionally doped with lithium; electrocatalytically active electrodes made from such compounds and electrical cells containing such electrodes.
Inventors
- 👤 Yitzchak Klein
- 👤 Jonathan R. Goldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:07
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/78; B01J23/005; B01J23/74; C; C25; C25B; C25B1/00; C25B1/01; C25B1/02; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; H; H01; H01M; H01M10/00; H01M10/42; H01M10/52; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
50 words
Crystalline mixed oxide selected from compounds of the formulae Co x Fe 3-x O n and Co x Ni 3-x O n , wherein x is between 0.05 and 3, n is between 3 and 5, containing from about 0.05 to 20 atom percent boron calculated on the mixed oxide.
Claim 2
Dependent Claim
50 words
Crystalline mixed oxide selected from compounds of the formulae Co x Fe 3-x O n and Co x Ni 3-x O n , wherein x is between 0.05 and 3, n is between 3 and 5, containing from about 0.05 to 20 atom percent boron calculated on the mixed oxide.
Claim 3
Dependent Claim
13 words
A crystalline mixed oxide according to claim 1, of the spinel crystal type.
Claim 4
Dependent Claim
15 words
A crystalline mixed oxide according to claim 1 wherein n is between 3.6 and 4.
Claim 5
Dependent Claim
28 words
A crystalline mixed oxide compound according to claim 1 wherein part of the cobalt, nickel or iron is replaced by an equivalent quantity of magnesium or calcium lithium.
Claim 6
Dependent Claim
41 words
Crystalline oxides containing boron, according to claim 1 consisting of oxides of the transition metals Co, Ni, Fe, optionally containing magnesium or calcium in a proportion so as to replace some of the Co, Ni or Fe, of spinel crystal structure.
Claim 7
Dependent Claim
10 words
Borided mixed oxides according to claim 1 in powder form.
Claim 8
Dependent Claim
15 words
Borided mixed oxides according to claim 1 in the form of an active surface layer.
Claim 9
Dependent Claim
21 words
A mixed oxide containing boron, according to claim 1 wherein part of the cobalt, nickel or iron is replaced by lithium.
Claim 10
Dependent Claim
29 words
A mixed oxide according to claim 6 in the form of a powder having a surface area of at least 20 m 2 /g determined by the BET techique.
Claim 11
Dependent Claim
14 words
An electrocatalytically effective surface comprising as active substance a mixed according to claim 1.
Claim 12
Dependent Claim
15 words
An electrocatalytically active electrode comprising as electrocatalytically active substance a spinel according to claim 3.
Claim 13
Dependent Claim
30 words
A process for producing an electrocatalytically active mixed oxide containing boron according to claim 1 which comprises reacting the mixed oxide in powder form with sodium borohydride at elevated temperature.
Claim 14
Dependent Claim
28 words
A process according to claim 12 for producing an electrocatalytically active borided mixed oxide which comprises reacting the mixed oxides with boric acid and carbon at elevated temperature.
Claim 15
Dependent Claim
46 words
A process for producing lithiated electrocatalytically active borided mixed oxides according to claim 4, of increased corrosion resistance in alkaline solutions, which comprises applying to said spinel a suitable lithium salt and subjecting same to a heat treatment, thus incorporating therein a predetermined quantity of lithium.
Claim 16
Dependent Claim
37 words
A process according to claim 14, wherein the mixed oxide is coated with a solution of lithium nitrate, iron nitrate and cobalt nitrate and the heat treatment is at a temperature of from 400° to 800° C.
Claim 17
Dependent Claim
28 words
Electrical secondary cells, fuel cells or electrolysis cells comprising an electrocatalytically active borided mixed oxide claimed in claim 1 in the form of an electrode or auxiliary electrode.
Claim 18
Dependent Claim
12 words
Electrochemical cells according to claim 16, wherein the borided spinel is lithiated.
References Cited (Backward Citations)
US2691660A
Cited
US3649485A
Cited
US3711382A
Cited
US3781350A
Cited
US3986892A
Cited
US3926844A
Cited
US4061549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |