Membrane electrode unit for the electrolysis of water

Details Membrane electrode unit for the electrolysis of water Membrane electrode unit for the electrolysis of water

2011-08-09

2011-08-09

Bell, Bruce F (Department: 1759)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S296000, C204S263000, C204S265000, C204S266000, C429S480000, C429S481000, C429S482000, C429S483000, C429S491000, C429S492000, C429S493000, C429S494000, C429S495000, C429S496000, C429S507000, C429S508000, C429S509000, C429S523000, C429S526000, C429S534000, C429S535000

Reexamination Certificate

active

07993499

ABSTRACT:
The invention relates to membrane-electrode assemblies for the electrolysis of water (electrolysis MEAs), which contain an ion-conducting membrane having a front and rear side; a first catalyst layer on the front side; a first gas diffusion layer on the front side; a second catalyst layer on the rear side, and a second gas diffusion layer on the rear side.The first gas diffusion layer has smaller planar dimensions than the ion-conducting membrane, whereas the second gas diffusion layer has essentially the same planar dimensions as the ion-conducting membrane (“semi-coextensive design”). The MEAs also comprise an unsupported free membrane surface that yields improved adhesion properties of the sealing material. The invention also relates to a method for producing the MEA products.Pressure-resistant, gastight and cost-effective membrane-electrode assemblies are obtained, that are used in PEM water electrolyzers, regenerative fuel cells or in other electrochemical devices.

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