Cathode for a direct methanol fuel cell and method for...

Details Cathode for a direct methanol fuel cell and method for... Cathode for a direct methanol fuel cell and method for...

2004-04-08

2009-12-29

Yuan, Dah-Wei D (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having earth feature

C429S010000

Reexamination Certificate

active

07638225

ABSTRACT:
In low-temperature fuel cells according to prior art, the problem often arises that the diffusion layer of the cathode is filled by water which is permeated or produced on the cathode, such that oxygen can no longer be transported to the catalyst layer of the cathode in a frictionless manner. As a result, said fuel cells are regularly used with a high excess of oxygen in order to reduce the cited transport problems for the oxygen. The inventive fuel cell enables said problem to be solved in that the arrangement of the diffusion layer and the catalyst layer of the cathode is inverted. The diffusion layer, which is embodied in such a way as to also conduct ions, is directly adjacent to the electrolyte membrane. The catalyst layer oriented towards the free cathode space can advantageously directly react with the supplied oxygen without further transport problems. A further advantage lies in the fact that the water produced on the catalyst layer of the cathode and/or permeated by the electrolyte membrane and the diffusion layer can be easily withdrawn via the free cathode space.

REFERENCES:
patent: 4585711 (1986-04-01), Vaidyanathan
patent: 6541147 (2003-04-01), McLean et al.
patent: 2002/0009627 (2002-01-01), Smotkin
patent: 2003/0006145 (2003-01-01), Schiepe et al.
patent: 100 48 182 (2001-05-01), None
patent: 1 096 586 (2001-05-01), None
patent: 1429408 (2004-06-01), None
patent: WO 03081707 (2003-02-01), None

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