US3926844A
Expired / Lapsed
US
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Catalysts for the cathodic hydrogen development
Assignee: Deutsche Automobil GmbH
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Filing: 1974-02-19
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Granted: 1975-12-16
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Expires: 1994-02-19
Abstract
Abstract A process for the production of catalysts for the cathodic hydrogen evolution in alkaline electrolytes, which comprises depositing at least one X-ray-amorphous boride compound of nickel, cobalt or iron on a supporting structure. The compound is deposited from an aqueous solution containing metallic ions such as nickel ions, cobalt ions, or iron ions, a complexing agent for the metallic ions and a water-soluble boranate or borazane (also known as aminoborane) at a temperature of below 60*C. The solution has a concentration of free metallic ions i.e., nickel, cobalt or iron ions, of below 10 10 mole/liter after addition of the complexing agent.
Inventors
- 👤 Gabor Benczur-Urmossy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:03
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/0201; B01J23/00; B01J23/70; B01J23/74; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; H; H01; H01M; H01M10/00; H01M10/24; H01M10/42; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
138 words
A PROCESS FOR THE PRODUCTION OF CATALYST FOR THE CATHODIC HYDROGEN EVOLUTION IN ALKALINE ELECTROLYTES, WHICH COMPRISES GROWING ONTO SURFACES SUITABLE AS AN ELECTRODE BASE AN X-RAY AMORPHOUS METALLIC BORIDE COMPOUND OF NICKEL COBALT OR IRON CONTAINING 5 TO 8 PERCENT BY WEIGHT OF BORON BY A REDUCING DEPOSITION IN AN AQUEOUS SOLUTION AT A TEMPERATURE OF BELOW 60*C., SAID SOLUTION INTIALLY CONSISTNG ESSENTIALLY OF WATER, METTALIC IONS SELECTED FROM THE GROUP CONSISTING OF NICKEL IONS, COBALT IONS ANDIRON IONS IN AN AMOUNT OF FROM 0.02 TO 0.2 MOLE/LITRE, A COMPLEXING AGENT FOR THE METALLIC IONS IN A CONCENTRATION OF FROM 1 TO 10 MOLE/LITER AND WATER-SOLUBLE BORANATE OF BORAZANES AS REDUCING AGENT IN A CONCENTRATION OF FROM 0.02 TO 0.2 MOLE/LITER, SAID SOLUTION HAVING A CONCENTRATION OF FREE METALLIC ION OF BELOW 10**10 MOLE/LITER DURING SAID GROWTH.
Claim 2
Dependent Claim
138 words
A PROCESS FOR THE PRODUCTION OF CATALYST FOR THE CATHODIC HYDROGEN EVOLUTION IN ALKALINE ELECTROLYTES, WHICH COMPRISES GROWING ONTO SURFACES SUITABLE AS AN ELECTRODE BASE AN X-RAY AMORPHOUS METALLIC BORIDE COMPOUND OF NICKEL COBALT OR IRON CONTAINING 5 TO 8 PERCENT BY WEIGHT OF BORON BY A REDUCING DEPOSITION IN AN AQUEOUS SOLUTION AT A TEMPERATURE OF BELOW 60*C., SAID SOLUTION INTIALLY CONSISTNG ESSENTIALLY OF WATER, METTALIC IONS SELECTED FROM THE GROUP CONSISTING OF NICKEL IONS, COBALT IONS ANDIRON IONS IN AN AMOUNT OF FROM 0.02 TO 0.2 MOLE/LITRE, A COMPLEXING AGENT FOR THE METALLIC IONS IN A CONCENTRATION OF FROM 1 TO 10 MOLE/LITER AND WATER-SOLUBLE BORANATE OF BORAZANES AS REDUCING AGENT IN A CONCENTRATION OF FROM 0.02 TO 0.2 MOLE/LITER, SAID SOLUTION HAVING A CONCENTRATION OF FREE METALLIC ION OF BELOW 10**10 MOLE/LITER DURING SAID GROWTH.
Claim 3
Dependent Claim
28 words
The process according to claim 1, wherein the deposition rate is controlled by the type and concentration of the complexing agent, as well as by the bath temperature.
Claim 4
Dependent Claim
20 words
The process according to claim 1, wherein the concentration of free metallic ion is 10 12 to 10 17 mole/liter.
Claim 5
Dependent Claim
27 words
The process according to claim 1, wherein the concentration of free metallic ion, when using ammonia as the complexing agent, is 10 15 to 10 17 mole/liter.
Claim 6
Dependent Claim
40 words
The process according to claim 1, wherein metallic ion concentration is 0.1 to 0.15 mole/liter; the boranate or borazane concentration is 0.05 to 0.1 mole/liter; and the concentration of complexing agent is 1 to 5 mole/liters in the aqueous solution.
Claim 7
Dependent Claim
23 words
The process according to claim 5, wherein the complexing agent concentration is from 1 to 10 equivalents/liters and especially 1 to 5 equivalents/liter.
Claim 8
Dependent Claim
29 words
The process according to claim 1, wherein the reducing deposition takes place directly onto the surfaces of a support structure of a metallic net or skeleton of metallic fibers.
Claim 9
Dependent Claim
24 words
The process according to claim 1, wherein the reducing deposition takes place onto the surfaces of a support structure of a porous dielectric substance.
Claim 10
Dependent Claim
24 words
The process according to claim 1, wherein sodium borohydride is the reducing agent, and deposition is carried out in ammoniacal or caustic alkali solutions.
Claim 11
Dependent Claim
25 words
The process according to claim 1, wherein when using borazanes, the deposition takes place in buffered baths at a pH of between 5 and 7.
Claim 12
Dependent Claim
27 words
The process according to claim 1, wherein the deposition speed, expressed by the accumulated growth per time unit onto smooth surfaces, is 0.1 - 10 Mu /hour.
Claim 13
Dependent Claim
16 words
The process according to claim 11, wherein the deposition speed is 0.2 to 0.5 Mu /hour.
Claim 14
Dependent Claim
15 words
The process according to claim 1, wherein the growth takes place from a stabilizer-free solution.
Claim 15
Dependent Claim
42 words
Catalysts for the cathodic hydrogen evolution in alkaline electrolytes, produced according to a process of claim 1, which comprises a layer deposit containing one or more X-ray-amorphous compounds of boron with nickel, cobalt, or iron on the surfaces of a supporting structure.
Claim 16
Dependent Claim
26 words
Cataysts according to claim 14, wherein said layer is on a supporting structure of a metallic net, a metallic fiber skeleton or a porous dielectric substance.
Claim 17
Dependent Claim
20 words
Catalysts according to claim 14, wherein said layer has a density of about 8 g./cm3 and a specific resistance of
Claim 18
Dependent Claim
19 words
Catalysts according to claim 14, wherein said layer is deposited from a solution which does not contain any stabilizers.
Claim 19
Dependent Claim
23 words
The process according to claim 1, wherein when using borazanes, the deposition takes place in buffered baths at a pH of about 6.
Claim 20
Dependent Claim
27 words
The process according to claim 1, wherein the deposition speed, expressed bY the accumulated growth per time unit onto smooth surface is 0.1 to 1.5 Mu /hour.
References Cited (Backward Citations)
US3210157A
Cited
US3322686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |