EP0276987A2
Expired / Lapsed
EP
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An integral fuel cell electrode and matrix and a method for manufacturing same
Assignee: Japan Gore Tex Inc
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Filing: 1988-01-27
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Granted: —
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Expires: 2008-01-27
Abstract
Abstract An integrally molded, combined fuel cell electrode and matrix is provided having a matrix layer (2) containing 3 to 20 weight percent polytetrafluoroethylene (PTFE) and 80 to 97 weight percent inorganic powder, the matrix being integral with an electrode layer (1) of PTFE containing a catalyst. The electrode layer preferably is 40 to 90 weight percent of electrically conductive fine powder, on which the catalyst has been supported, and 10 to 60 weight percent PTFE. In the method for manufacture of the fuel cell electrode and matrix, the layers are laminated by rolling and reduced simultaneously to their final thicknesses.
Inventors
- 👤 Hiroshi Kato
- 👤 Ichiro Komada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:47
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8878; H01M4/90; H01M4/92; H01M4/925; H01M4/926; H01M8/00; H01M8/02; H01M8/0289; H01M8/0293; H01M4/8663; H01M4/8668; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
39 words
A fuel cell electrode and matrix comprising a matrix layer containing 3 to 20 weight percent PTFE and 80 to 97 weight percent inorganic powder integrally formed on one side of an electrode layer of PTFE containing a catalyst.
Claim 2
Dependent Claim
39 words
A fuel cell electrode and matrix comprising a matrix layer containing 3 to 20 weight percent PTFE and 80 to 97 weight percent inorganic powder integrally formed on one side of an electrode layer of PTFE containing a catalyst.
Claim 3
Dependent Claim
22 words
A fuel cell electrode and matrix according to claim 1 wherein the thickness of said matrix layer is 10 to 250 micrometers.
Claim 4
Dependent Claim
39 words
A fuel cell electrode and matrix according to claim 1 wherein the electrode layer comprises 40 to 90 weight percent of electrically conductive fine powder on which said catalyst has been supported and 10 to 60 weight percent PTFE.
Claim 5
Dependent Claim
22 words
A fuel cell electrode and matrix according to claim 1 wherein said inorganic powder is SiC, Ta₂O₅, ZrO₂ or carbon fine powder.
Claim 6
Dependent Claim
27 words
A fuel cell electrode and matrix according to claim 1 wherein said electrode layer is PTFE containing fine carbon powder on which said catalyst has been supported.
Claim 7
Dependent Claim
15 words
A fuel cell electrode and matrix according to claim 1 wherein said catalyst is platinum.
Claim 8
Dependent Claim
42 words
A fuel cell electrode and matrix according to claim 1 wherein said matrix layer contains carbon fine powder and has integrally formed, on its side opposite said electrode layer, a layer of PTFE containing an inorganic powder which possesses electrical insulating properties.
Claim 9
Dependent Claim
24 words
A fuel cell electrode and matrix according to claim 7 wherein said inorganic powder which possesses electrical insulating properties is SiC, Ta₂O₅ or ZrO₂.
Claim 10
Dependent Claim
39 words
A fuel cell electrode and matrix according to claim 1 wherein said matrix layer has a second counter electrode layer of PTFE containing a catalyst integrally formed on the second side of said matrix layer opposite said electrode layer.
Claim 11
Dependent Claim
36 words
A fuel cell electrode and matrix according to claim 1 having a layer of unsintered, expanded, porous PTFE containing electrically conductive fine powder integrally formed on the side of said electrode opposite that of said matrix.
Claim 12
Dependent Claim
25 words
A fuel cell electrode and matrix according to claim 1 wherein said electrode layer has openings therethrough filled with the material of said matrix layer.
Claim 13
Independent Claim
115 words
A method for manufacturing an integrally moulded fuel cell electrode and matrix comprising: (a)(i) forming a catalyst layer element which contains PTFE and a catalyst, and (ii) forming a matrix composition layer element which contains 3 to 20 weight percent PTFE and 80 to 97 weight percent inorganic powder, prepared as elements whose thicknesses are greater than the thicknesses of the respective layers in the desired finished product, and whose thicknesses are in accordance with a ratio determined from the thickness ratio of the respective layers in said finished product, and (b) laminating said elements together by rolling so that said elements are reduced to their final thicknesses and simultaneously formed into an integral body.
Claim 14
Independent Claim
115 words
A method for manufacturing an integrally moulded fuel cell electrode and matrix comprising: (a)(i) forming a catalyst layer element which contains PTFE and a catalyst, and (ii) forming a matrix composition layer element which contains 3 to 20 weight percent PTFE and 80 to 97 weight percent inorganic powder, prepared as elements whose thicknesses are greater than the thicknesses of the respective layers in the desired finished product, and whose thicknesses are in accordance with a ratio determined from the thickness ratio of the respective layers in said finished product, and (b) laminating said elements together by rolling so that said elements are reduced to their final thicknesses and simultaneously formed into an integral body.
Claim 15
Dependent Claim
27 words
A method according to claim 12, wherein said elements which form said catalyst layer and said matrix composition layer are formed by a paste extrusion moulding process.
Claim 16
Dependent Claim
43 words
A method according to claim 12 further comprising forming openings in the catalyst layer element so that said openings pass through said element, and filling said openings with the same composition as the matrix composition layer during the lamination and thinning by rolling.
References Cited (Backward Citations)
No citation records indexed.
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