US4696872A
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Process for producing a catalytic layer for a fuel cell electrode
Assignee: ZERO EMISSION VEHICLE Co BELGIUM bvba
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Filing: 1986-09-03
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Granted: 1987-09-29
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Expires: 2006-09-03
Abstract
Abstract Present invention relates to a process for producing a catalytic layer for a fuel cell electrode, which process is characterized in that first step at least two carbons or mixtures of carbons are separately mixed with binder, subsequently in a second step these separate carbon/binder mixtures are intimately mixed together and after that in a third step the mixture obtained is formed into a catalytic layer of the desired dimensions.
Inventors
- 👤 Alain P. O. Blanchart
- 👤 Christian J. E. C. Van Der Poorten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:31
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
64 words
Process for producing a catalytic layer for a fuel cell electrode, characterized in that in a first step at least two carbons or mixtures of carbons are separately mixed with binder, subsequently in a second step these separate carbon/binder mixtures are intimately mixed together and after that in a third step the mixture obtained is formed into a catalytic layer of the desired dimensions.
Claim 2
Dependent Claim
64 words
Process for producing a catalytic layer for a fuel cell electrode, characterized in that in a first step at least two carbons or mixtures of carbons are separately mixed with binder, subsequently in a second step these separate carbon/binder mixtures are intimately mixed together and after that in a third step the mixture obtained is formed into a catalytic layer of the desired dimensions.
Claim 3
Dependent Claim
124 words
Process according to claim 1, characterized in that in the first step carbon or a mixture of carbons with a relatively low specific surface, lower than 100 m 2 g -1 , provided with 1-10% (wt) noble metal, is mixed with a binder and in addition a cabon or a mixture of carbons with a relatively high specific surface, higher than 150 m 2 g -1 , provided with 0-10% (wt) noble metal, is mixed with a binder, the percentage by weight of noble metal on the carbon or mixture of carbons with a relatively low specific surface being higher than or equal to the percentage by weight of noble metal on the carbon or mixture of carbons with a relatively high specific surface.
Claim 4
Dependent Claim
32 words
Process according to claim 1 characterized in that the carbon or mixture of carbons with a relatively low specific surface has a specific surface lower than 50 m 2 g -1 .
Claim 5
Dependent Claim
33 words
Process according to claim 1, characterized in that the carbon or mixture of carbons with a relatively high specific surface has a specific surface between 200 and 1200 m 2 g -1 .
Claim 6
Dependent Claim
33 words
Process according to claim 4, characterized in that the carbon or mixture of carbons with a relatively high specific surface has a specific surface between 250 and 500 m 2 g -1 .
Claim 7
Dependent Claim
33 words
Process according to claim 1, characterized in that the carbon or the whole or a part of the mixture of carbons with a relatively high specific surface has been subjected to thermal treatment.
Claim 8
Dependent Claim
30 words
Process according to claim 1, characterized in that as carbon or as the whole or part of the mixture of carbons with a relatively low specific surface graphite is used.
Claim 9
Dependent Claim
18 words
Process according to claim 7, characterized in that at least a part of this graphite has been etched.
Claim 10
Dependent Claim
31 words
Process according to claim 1, characterized in that as carbon or as the whole or part of the mixture of carbons with a relatively high specific surface activated carbon is used.
Claim 11
Dependent Claim
26 words
Process according to claim 1, characterized in that per 100 parts by weight carbon 3-50 parts by weight, specifically 3-30 parts by weight, binder is used.
Claim 12
Dependent Claim
13 words
Process according to claim 1, characterized in that the noble metal is Pt.
Claim 13
Dependent Claim
12 words
Process according to claim 1, characterized in that the binder is PTFE.
Claim 14
Dependent Claim
43 words
Process according to claim 2, characterized in that the weight ratio applied between the carbon or mixture of carbons with a relatively low specific surface and the carbon or mixture of carbons with a relatively high specific surface is between 10:1 and 1:10.
Claim 15
Dependent Claim
17 words
Fuel cell electrode, characterized in that this electrode contains a catalytic layer produced according to claim 1.
Claim 16
Dependent Claim
18 words
Fuel cell, characterized in that this cell contains at least one fuel cell electrode according to claim 14.
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) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |