US4447505A
Expired / Lapsed
US
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Fuel cell electrode
Assignee: Electrochemische Energieconversie NV
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Filing: 1981-12-01
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Granted: 1984-05-08
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Expires: 2001-12-01
Abstract
Abstract The invention relates to a fuel cell electrode provided with a catalytic layer containing a noble metal on carbon with a relatively low specific surface and a carbon with a relatively high specific surface, of which electrode the catalytic layer contains noble metal on carbon with a specific surface lower than 100 m 2 g -1 and carbon with a specific surface higher than 150 m 2 g -1 on which there is at most an equally large percentage by weight of noble metal as on the carbon having a relatively low specific surface. The invention also relates to a process for preparing such a fuel cell electrode.
Inventors
- 👤 Alain P. O. Blanchart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:32
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A fuel cell electrode having a catalytic layer composed of two separately prepared intimate mixtures of a noble metal on carbon, the first mixture comprising a noble metal on carbon having a relatively low specific surface area of less than 100 m 2 g -1 , and the second mixture comprising a noble metal on carbon having a relatively high surface area of greater than 150 m 2 g -1 , the amount by weight of noble metal in said second mixture being equal to or less than the amount by weight of nobel metal in said first mixture.
Claim 2
Dependent Claim
99 words
A fuel cell electrode having a catalytic layer composed of two separately prepared intimate mixtures of a noble metal on carbon, the first mixture comprising a noble metal on carbon having a relatively low specific surface area of less than 100 m 2 g -1 , and the second mixture comprising a noble metal on carbon having a relatively high surface area of greater than 150 m 2 g -1 , the amount by weight of noble metal in said second mixture being equal to or less than the amount by weight of nobel metal in said first mixture.
Claim 3
Dependent Claim
29 words
A fuel cell electrode according to claim 1 wherein the carbon in said first mixture has a specific surface area of less than 50 m 2 g -1 .
Claim 4
Dependent Claim
32 words
A fuel cell electrode according to claim 1 or claim 2 wherein the carbon in said second mixture has a specific surface area between 200 and 1200 m 2 g -1 .
Claim 5
Dependent Claim
24 words
A fuel cell electrode according to claim 1 or 2 wherein the carbon in said second mixture has been subject to a thermal treatment.
Claim 6
Dependent Claim
19 words
A fuel cell electrode according to claim 1 or 2 wherein the carbon in said first mixture is graphite.
Claim 7
Dependent Claim
14 words
A fuel cell electrode according to claim 5 wherein the graphite has been etched.
Claim 8
Dependent Claim
20 words
A fuel cell electrode according to claim 1 or 2 wherein the carbon in said second mixture is activated carbon.
Claim 9
Dependent Claim
74 words
A fuel cell electrode according to claim 1 wherein the amount of noble metal in said first mixture is from 1 to 10% by weight of the carbon in the first mixture and the amount of noble metal in said second mixture is from 1 to 10% by weight of the carbon in the second mixture, provided that the weight ratio of carbon in said first and second mixtures is between 10:1 or 1:10.
Claim 10
Dependent Claim
16 words
A fuel cell electrode according to claim 8 wherein the catalytic layer also contains a binder.
Claim 11
Dependent Claim
14 words
A fuel cell electrode according to claim 1 wherein the noble metal is Pt.
Claim 12
Dependent Claim
24 words
A fuel cell electrode according to claim 10 containing 3 to 30 parts by weight of binder per 100 parts by weight of carbon.
Claim 13
Dependent Claim
13 words
A fuel cell electrode according to claim 11 wherein said binder is polytetrafluorethylene.
Claim 14
Dependent Claim
13 words
A fuel cell comprising the fuel cell electrode of claim 1 or 2.
Claim 15
Dependent Claim
11 words
A fuel cell battery comprising fuel cells according to claim 13.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |