Self-wetting membrane electrode unit and fuel cell having such a unit

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United States of America Patent

PATENT NO 9911992
SERIAL NO

14888361

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A membrane electrode assembly and fuel cell having such assembly. The membrane electrode assembly has a polymer electrolyte membrane, two catalytic electrodes in contact with the polymer electrolyte membrane on both sides, namely an anode and a cathode, and two gas diffusion layers directly or indirectly adjoining the electrodes, namely an anode-side gas diffusion layer and a cathode-side gas diffusion layer. At least one of the gas diffusion layers may optionally feature a microporous layer facing the polymer electrolyte membrane. The sequence of layers is anode-side gas diffusion layer, anode-side microporous layer, anode, polymer electrolyte membrane, cathode, cathode-side microporous layer, cathode-side gas diffusion layer. A relative hydrophobicity of at least two of these components and/or a hydrophobicity gradient within at least one of these components, and a relative pore structure having pore size and/or porosity of at least two of these components and/or a gradient within the pore structure of at least one of these components, is designed in such a way that it promotes the transport of water via the polymer electrolyte membrane, preferably from the cathode side to the anode side.

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Patent Owner(s)

  • VOLKSWAGEN AG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hubner, Gerold Braunschweig, DE 2 4
Scholz, Hannes Braunschweig, DE 12 11

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