Patent EP0577291A1 successfully refreshed from Google Patents.
EP0577291A1
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EP
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Membrane electrode assemblies
Assignee: Johnson Matthey PLC
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Filing: 1993-06-16
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Granted: —
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Expires: 2013-06-16
Abstract
Abstract A porous electrode suitable for use in a membrane electrode assembly for solid polymer fuel cells comprises a highly dispersed precious metal catalyst on particulate carbon impregnated with proton conducting polymer, and, a further component comprising hydrophobic polymer and a dispersion of particulate carbon, the loading of precious metal being 0.01-1.0mg/cm² of geometric electrode area. Said electrode demonstrates high effective platinum surface area and power density output when fabricated into a membrane electrode assembly.
Inventors
- 👤 Graham Alan Hards
- 👤 Thomas Robertson Ralph
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 19:02
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/1004; H01M4/00; H01M4/86; H01M4/88; H01M4/8825; H01M4/8828; H01M4/8835; H01M4/8839; H01M4/8846; H01M4/8878; H01M4/8882; H01M4/8892; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A porous electrode suitable for use in a membrane electrode assembly for solid polymer fuel cells, said electrode comprising a first component comprising a highly dispersed precious metal catalyst on particulate carbon impregnated with proton conducting polymer, and a second component comprising hydrophobic polymer and a dispersion of particulate carbon, characterised in that said highly dispersed precious metal catalyst is present at a precious metal loading of 0.01-1.0mg/cm² of geometric electrode area.
Claim 2
Dependent Claim
26 words
A porous electrode according to claim 1, characterised in that the highly dispersed precious metal catalyst comprises one or more platinum group metals or alloys thereof.
Claim 3
Dependent Claim
22 words
A porous electrode according to claim 2, characterised in that the highly dispersed precious metal catalyst comprises platinum or an alloy thereof.
Claim 4
Dependent Claim
24 words
A porous electrode according to any of claims 1-3, characterised in that the proton conducting polymer of the first component comprises a perfluorosulphonate ionomer.
Claim 5
Dependent Claim
24 words
A porous electrode according to any of claims 1-4, characterised in that the hydrophobic polymer of the second component comprises polytetrafluoro-ethylene or ethylene-propylene copolymer.
Claim 6
Dependent Claim
31 words
A porous electrode according to any of claims 1-5, characterised in that the highly dispersed precious metal catalyst is present at a precious metal loading of 0.05-1.0mg/cm² of geometric electrode area.
Claim 7
Dependent Claim
29 words
A porous electrode according to claim 6, characterised in that the highly dispersed precious metal catalyst is present at a precious metal loading of 0.05-0.5mg/cm² of geometric electrode area.
Claim 8
Dependent Claim
14 words
A membrane electrode assembly containing an electrode as defined in any of claims 1-7.
Claim 9
Dependent Claim
98 words
A process for the production of an electrode suitable for use in a solid polymer electrolyte fuel cell, comprising: i) the preparation of a first component containing highly dispersed precious metal catalyst on particulate carbon impregnated with proton conducting polymer; ii) the preparation of a second component comprising adding hydrophobic polymer to a dispersion of particulate carbon and firing, and the combination of said second component with said first component; and iii) fabrication into an electrode, characterised in that said highly dispersed precious metal catalyst is present in a precious metal loading of 0.01-1.0mg/cm² of geometric electrode area.
References Cited (Backward Citations)
FR2404312A1
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US4816431A
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