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Gas diffusion layer

A gas diffusion layer, water domain technology, applied in electrical components, solid electrolyte fuel cells, fuel cells, etc., can solve problems such as hindering gas transmission and reducing output power

Inactive Publication Date: 2011-06-22
SGL CARBON SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem with this type of fuel cell is the balance between the necessary humidity retention of the membrane and the adjacent catalyst layer and the drainage of the water formed, which would otherwise fill the GDL pores, impede gas transport and reduce the output power

Method used

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Examples

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Effect test

Embodiment 1

[0018] Will the model Sigracet Carbon fiber paper of GDL 25BA (SGL Technologies GmbH, Meitingen) was coated with a coating paste (layer thickness 30-50 μm) on a laboratory blade and subsequently sintered at 350° C. for 10 minutes. To the coating paste (consisting of 77% acetylene black, 23% polytetrafluoroethylene (PTFE) and organic binder) were added different amounts of pre-ground alumina fibers (previously dispersed in water).

[0019] Sample A (MUSTER A): 0.16% alumina fiber relative to the solids content of the paste

[0020] Sample B (MUSTER B): 0.29% alumina fiber relative to the solids content of the paste

[0021] Sample C (MUSTER C): 0.67% alumina fiber relative to the solids content of the paste

[0022] The small amount of inorganic fibers in the coating already renders the surface significantly hydrophilic (a fiber-free surface is significantly hydrophobic due to the PTFE portion within the layer). But the resistance also rises with increasing fiber proportion...

Embodiment 2

[0025] Aqueous dispersions of alumina fibers (0.01 to 0.05%, with added binder / dispersant) are vacuum dehydrated on uncoated GDL substrates on a screen (eg pager / paper machine). This results in a fiber deposit oriented in the x-y direction on the GDL. After drying the GDL has a microporous layer.

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Abstract

The invention relates to a gas diffusion layer (GDL) on the basis of carbon fibers utilized in polymer electrolyte membrane (PEM) fuel cells having structured hydrophilic properties, wherein materials having hydrophilic properties are selected from the group of metal oxides at a mean domain size of 0.5 to 80 [mu]m being present in the gas diffusion layer as hydrophilic wicks.

Description

technical field [0001] The invention relates to a carbon fiber based gas diffusion layer (Gas Diffusion Layer - GDL) with structured hydrophiles for use in polymer-electrolyte-membrane (PEM) fuel cells (BZ) . Background technique [0002] Fuel cells are highly efficient energy sources in which fuel (typically a hydrogen-rich gas) and oxidant (typically air oxygen) are electrochemically converted to water on catalyst layers on both major faces of a PEM. The electrical energy is generated by an electrochemical reaction and the reactants react with the formation of water. In this respect the PEM undertakes the transport of protons between the half-cells, where the electrons are used to perform electrical work via the electrodes and the external circuit. The main problem with this type of fuel cell is the balance between the necessary humidity retention of the membrane and adjacent catalyst layers and the drainage of the water that forms, which otherwise fills the GDL pores, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/04H01M8/10
CPCH01M8/0234H01M8/0247Y02E60/50H01M8/0239H01M2008/1095H01M8/04171H01M8/0241
Inventor 彼得·维尔德鲁迪格尔-伯恩德·施魏斯
Owner SGL CARBON SE
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