Patent US2050855A successfully refreshed from Google Patents.
Patent US3899356A successfully refreshed from Google Patents.
US3899356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous electrode for a fuel cell and method of making same
Assignee: Cegelec SA
•
Filing: 1974-01-24
•
Granted: 1975-08-12
•
Expires: 1994-01-24
Abstract
Abstract A porous electrode for a fuel cell comprising a catalytic layer comprised of a mixture of active carbon and teflon, a stop layer comprised of teflon deposited on the catalytic layer, and current collector means including a grid compressed on the two preceding layers, so that it crosses through the stop layer and penetrates into a part of the thickness of the catalytic layer. The electrode has a porosity in the order of 50%.
Inventors
- 👤 Pierre Groult
- 👤 Francois Hubert
- 👤 Jacques Daunay
- 👤 Pierre Bono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
99 words
A POROUS ELECTRODE FOR A FUEL CELL COMPRISING: A CATALYTIC LAYER CONTAINING A MIXTURE OF A CATALYST AND OF A POLYMER, A STOP LAYER ARRANGED ON ONE OF THE FACES OF THE CATALYTIC LAYER AND CONSISTING ESSENTIALLY OF SAID POLYMER, THE STOP LAYER AND THE CATALYTIC LAYER HAVING AN OPEN POROSITY OF FROM ABOUT 40 TO ABOUT 60%, AND CURRENT COLLECTOR MEANS MADE OF AN ELECTRONICALLY CONDUCTIVE AND CHEMICALLY INERT MATEIAL, SAID ELECTRODE BEING CHARACTERIZED IN THAT THE CURRENT COLLECTOR MEANS CROSSES THROUGH PORTIONS OF THE WHOLE OF THE STOP LAYER AND PENETRATES INTO PORTIONS OF THE CATALYTIC LAYER
Claim 2
Dependent Claim
99 words
A POROUS ELECTRODE FOR A FUEL CELL COMPRISING: A CATALYTIC LAYER CONTAINING A MIXTURE OF A CATALYST AND OF A POLYMER, A STOP LAYER ARRANGED ON ONE OF THE FACES OF THE CATALYTIC LAYER AND CONSISTING ESSENTIALLY OF SAID POLYMER, THE STOP LAYER AND THE CATALYTIC LAYER HAVING AN OPEN POROSITY OF FROM ABOUT 40 TO ABOUT 60%, AND CURRENT COLLECTOR MEANS MADE OF AN ELECTRONICALLY CONDUCTIVE AND CHEMICALLY INERT MATEIAL, SAID ELECTRODE BEING CHARACTERIZED IN THAT THE CURRENT COLLECTOR MEANS CROSSES THROUGH PORTIONS OF THE WHOLE OF THE STOP LAYER AND PENETRATES INTO PORTIONS OF THE CATALYTIC LAYER
Claim 3
Dependent Claim
23 words
The electrode of claim 1, further comprising a separator layer comprising a fibrous tissue arranged on the other face of the catalytic layer.
Claim 4
Dependent Claim
30 words
The electrode of claim 1, wherein said current collector means is a reticulated member having a plurality of interconnected portions that extend through said stop layer into said catalytic layer.
Claim 5
Dependent Claim
36 words
The electrode of claim 1, wherein said collector means is a metallic grid having a plurality of elements spaced from each other in a predetermined pattern that extend through said stop layer into said catalytic layer.
Claim 6
Dependent Claim
22 words
The electrode of claim 4, wherein said grid is made of two sets of parallel extending metallic elements, which intersect each other.
Claim 7
Dependent Claim
15 words
The electrode of claim 4, wherein the grid is made of nickel or stainless steel.
Claim 8
Dependent Claim
12 words
The electrode of claim 1, wherein the polymer is a polyfluorinated polyolefin.
Claim 9
Dependent Claim
17 words
The electrode of claim 1, wherein the catalyst is powdered active carbon and said polymer is polytetrafluorethylene.
Claim 10
Dependent Claim
73 words
The electrode of claim 1, wherein the collector means penetrates into said catalytic layer with an outer surface that is level with and that forms a portion of an outer surface of one face of the electrode and an inner surface that contacts portions of the stop layer disposed within said electrode, other portions of said stop layer forming the remaining portions of the outer surface of said one face of the electrode.
Claim 11
Dependent Claim
14 words
The electrode of claim 1, wherein the catalytic layer is a sintered porous member.
Claim 12
Independent Claim
135 words
A method for preparing a porous electrode for a fuel cell which comprises: a. depositing a mixture of a catalyst in a proportion by weight comprised between about 90 and about 40% and of a polymer in a proportion by weight comprised between about 10 and about 60%, dispersed in a liquid volatile diluent, on a metal sheet; b. partial drying the deposit; c. depositing a stop layer consisting essentially of said polymer diluted in the liquid diluent on the catalytic layer; d. drying of the stop layer; e. arranging a current collector means on the stop layer and compressing the collector means at a pressure from about 500 to about 2,500 kg/sq. cm to form an assembly of layers and collector means; and f. sintering of the assembly by heating at an elevated temperature.
Claim 13
Independent Claim
135 words
A method for preparing a porous electrode for a fuel cell which comprises: a. depositing a mixture of a catalyst in a proportion by weight comprised between about 90 and about 40% and of a polymer in a proportion by weight comprised between about 10 and about 60%, dispersed in a liquid volatile diluent, on a metal sheet; b. partial drying the deposit; c. depositing a stop layer consisting essentially of said polymer diluted in the liquid diluent on the catalytic layer; d. drying of the stop layer; e. arranging a current collector means on the stop layer and compressing the collector means at a pressure from about 500 to about 2,500 kg/sq. cm to form an assembly of layers and collector means; and f. sintering of the assembly by heating at an elevated temperature.
Claim 14
Dependent Claim
18 words
The method of claim 11, wherein the catalyst is active carbon and the polymer is a polyfluorinated polyolefin.
Claim 15
Dependent Claim
10 words
The method of claim 12, wherein the polymer is polytetrafluorethylene.
Claim 16
Dependent Claim
33 words
The method of claim 13, wherein the assembly is sintered in a neutral or reducing atmosphere at a temperature of from about 350*C. to about 420*C. for about 5 to about 60 minutes.
Claim 17
Dependent Claim
10 words
The method of claim 11, wherein said diluent is dibutylphthalate.
Claim 18
Dependent Claim
14 words
The method of claim 11, wherein a lubricant is used jointly with the diluent.
Claim 19
Dependent Claim
12 words
The method of claim 16, wherein the lubricant is a fluorocarbon oil.
Claim 20
Dependent Claim
11 words
The method of claim 1, wherein the metal sheet is aluminum.
Claim 21
Dependent Claim
13 words
An electrochemical storage cell comprising at least one electrode according to claim 1.
Claim 22
Dependent Claim
12 words
The electrode of claim 1, wherein the stop layer consists of polytetrafluorethylene.
Claim 23
Dependent Claim
13 words
The electrode of claim 1, wherein the stop layer is free of catalyst.
Claim 24
Dependent Claim
15 words
A method of claim 11, wherein said stop layer consists of polytetrafluorethylene diluted in dibutylphthalate.
Claim 25
Dependent Claim
13 words
The method of claim 11, wherein the stop layer is free of catalyst.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |