Title:
MEMBRANE-ELECTRODE ASSEMBLY FOR A SELF-HUMIDIFYING FUEL CELL
Document Type and Number:
WIPO Patent Application WO2003026035
Kind Code:
A3
Abstract:
The invention relates to a membrane-electrode assembly for a self-humidifying fuel cell. The electrodes of the inventive MEA consist of a catalyst layer that is applied to the membrane side, a microporous electrode layer that borders said catalyst layer and a macroporous electrode layer immediately adjacent to said microporous layer. The latter comprises platelet-shaped graphite on the cathode side and on the anode side carbon black particles with a rough surface and the capacity to store water. As a result of the construction and the morphology of the respective electrode, the co-operation between the two electrodes of the MEA composite and their adaptation to one another, a mass flow is formed from the cathode to the anode, said flow favouring the back-diffusion of the reaction water through the electrolyte, thus guaranteeing sufficient humidification of the electrolyte.
Inventors:
BIEGERT HUBERTUS (DE)
TOTH GABOR (DE)
TOTH GABOR (DE)
Application Number:
PCT/EP2002/010328
Publication Date:
December 04, 2003
Filing Date:
September 14, 2002
Export Citation:
Assignee:
BALLARD POWER SYSTEMS (CA)
BIEGERT HUBERTUS (DE)
TOTH GABOR (DE)
BIEGERT HUBERTUS (DE)
TOTH GABOR (DE)
International Classes:
H01M4/86; H01M4/96; H01M8/04119; H01M8/1004; H01M; (IPC1-7): H01M8/10; H01M4/86
Foreign References:
| US5869201A | 1999-02-09 | |||
| EP1045467A1 | 2000-10-18 |
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