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Gas diffusion layer, arrangement and method for the production thereof

A technology of gas diffusion layer and arrangement structure, applied in the direction of structural parts, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of continuous production and processing, etc.

Inactive Publication Date: 2008-04-30
CARL FREUDENBERG KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the paper that exceeds a certain thickness can no longer be rolled up, and therefore cannot be continuously produced and processed.
[0007] The gas diffusion layers known from the prior art are therefore disadvantageous in many respects

Method used

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  • Gas diffusion layer, arrangement and method for the production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A two-layer gas diffusion layer is fabricated as follows:

[0043] The first layer is first produced by calendering and laying down texturized, oxidized polyacrylonitrile fibers into a web. Thereafter the Flor was eddy deformed and consolidated with high pressure water jets at a pressure of 150 Bar. The layer was then dried at 120°C. The first layer is then compressed to a thickness of 0.2 mm by means of a calender at a temperature of 320°C. The first layer is then carbonized at a temperature of 1400° C. in a nitrogen atmosphere. The first layer thus made has a 65g / m 2 weight per unit area.

[0044] The second layer is a commercially available carbon fiber paper. This carbon fiber paper is manufactured by Toray Industries Inc. in Japan under the product name TGPH 30. The two layers are placed on top of each other and compacted during insertion into the fuel cell. This time the first layer faces the membrane of the fuel cell.

Embodiment 2

[0046] Example 2 shows a gas diffusion layer in which the first layer is produced analogously to the first layer in example 1. The first layer differs from the first layer in Example 1 only in basis weight.

[0047] According to the weight per unit area of ​​the first layer of embodiment 2 is 100g / m 2 . The second layer acts as a coating. The coating has a 25g / m 2 and is made of 80% carbon black and 20% phenolic resin (9282 FP type, Bakelite company, Germany). The coating is punctiform, where the diameter of the dots is less than 0.5mm. The coating was such that a one-sided coverage of 27% of the first layer was formed. The coating is applied on the first layer by means of screen printing. For screen printing, a paste consisting of 20% solid matter, ie carbon black and phenolic resin, and 80% water is used. After applying the paste by screen printing, drying was performed at a temperature of 120° C., thereby evaporating moisture. A tempering process is then carried out...

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Abstract

A gas diffusion layer, including at least two functional areas (2a, 2b) which are operationally linked to one another, the first area (2a) having a porous structure and the second area (2b) being designed as a stabilization zone, achieves the object of providing a system which implements problem-free operation of a fuel cell while optimizing its efficiency. A system which includes two gas diffusion layers and a method for manufacturing the gas diffusion layer achieve the further cited objects.

Description

technical field [0001] The invention relates to a gas diffusion layer. Furthermore, the invention relates to an arrangement comprising two gas diffusion layers. Finally, the invention relates to a method for producing said gas diffusion layer. Background technique [0002] Gas diffusion layers are used in fuel cells. A typical structure of a fuel cell is characterized by a layer sequence of bipolar plates with gas distribution structures, gas diffusion layers and reaction layer arrangement (formation). In order to reduce the contact resistance, the layers are extruded / laminated (mutually). In order to achieve a uniform compression independent of thickness tolerances, it is desirable for the gas diffusion layer to be as elastic as possible. [0003] However, the elastic gas diffusion layer enters the gas channels of the fuel cell. In gas distributors of fuel cells in the automotive sector, the depth of the channels is very small and wide. The depth of the channel is les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M8/10
CPCH01M8/0271H01M2008/1095H01M8/0245H01M8/0234H01M4/8807Y02E60/50Y10T442/40Y10T442/60Y10T442/30Y10T428/249953Y02P70/50H01M8/02H01M4/86H01M4/88
Inventor A·赫尔博德K·撒拉玛D·赖贝尔K-D·瓦格纳A·波克S·瓦格纳
Owner CARL FREUDENBERG KG