Gas diffusion layer, preparation method thereof and fuel cell

A gas diffusion layer and fuel cell technology, applied in fuel cells, battery electrodes, circuits, etc., can solve problems such as shortening process development time, reducing fuel cell gas resistance, membrane electrode flooding and uneven reaction gas transfer, etc. The effect of shortening process development time, saving production and preparation costs, and simple production process

Pending Publication Date: 2022-02-01
FAW JIEFANG AUTOMOTIVE CO
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In view of the problems existing in the prior art, the present invention provides a gas diffusion layer and its preparation method and a fuel cell. Two materials with high air permeability and high water conductivity are prepared by mixing components with different formulation amounts. The porous layer formed by the interlaced distribution of the two materials is used as an auxiliary material for the gas diffusion layer, and forms a new structure of the gas diffusion layer with the fiber skeleton layer, which solves the problems of water flooding of the membrane electrode and uneven transfer of reactant gas during the operation of the fuel cell, and reduces the The gas resistance of the fuel cell can realize the customized development and production matching the shape of the flow field of the bipolar plate, shorten the process development time, and save the production and preparation cost

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  • Gas diffusion layer, preparation method thereof and fuel cell
  • Gas diffusion layer, preparation method thereof and fuel cell
  • Gas diffusion layer, preparation method thereof and fuel cell

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Embodiment 1

[0063] This embodiment provides a gas diffusion layer, the density of the gas diffusion layer is 55g / cm 2 , the gas diffusion layer includes a stacked short carbon fiber skeleton layer and a porous layer; the porosity of the short carbon fiber skeleton layer is 80%, and the porous layer includes air-permeable materials and water-conducting materials interlaced.

[0064] The thickness of the water-conducting material is 62 μm, and the thickness of the air-permeable material is 44 μm.

[0065] The preparation method of the gas diffusion layer comprises the following steps:

[0066] (1) Use short carbon fiber materials to mix materials, and obtain the skeleton layer through paving, water repelling, curing and fixing the fiber skeleton layer;

[0067] (2) Divide the water-conducting material into 8 times and apply it on the framework layer obtained in step (1), and vacuum-dry it at 105° C. to obtain a composite layer;

[0068] (3) Scrape-coat the water-permeable material on the ...

Embodiment 2

[0073] This embodiment provides a gas diffusion layer, the density of the gas diffusion layer is 30g / cm 2 , the gas diffusion layer includes a stacked short carbon fiber skeleton layer and a porous layer; the porosity of the short carbon fiber skeleton layer is 75%, and the porous layer includes air-permeable materials and water-conducting materials interlaced.

[0074]The thickness of the water-conducting material is 100 μm; the thickness of the breathable material is 50 μm.

[0075] The preparation method of the gas diffusion layer comprises the following steps:

[0076] (1) Use short carbon fiber materials to mix materials, and obtain the skeleton layer through paving, water repelling, curing and fixing the fiber skeleton layer;

[0077] (2) Scrape-coat the water-conducting material once on the skeleton layer obtained in step (1), and vacuum-dry it at 115°C to obtain a composite layer;

[0078] (3) Scrape-coat the water-permeable material once on the composite layer obtai...

Embodiment 3

[0083] This embodiment provides a gas diffusion layer, the density of the gas diffusion layer is 60g / cm 2 , the gas diffusion layer includes a stacked short carbon fiber skeleton layer and a porous layer; the porosity of the short carbon fiber skeleton layer is 95%, and the porous layer includes air-permeable materials and water-conducting materials interlaced.

[0084] The thickness of the water-conducting material is 25 μm, and the thickness of the air-permeable material is 10 μm.

[0085] The preparation method of the gas diffusion layer comprises the following steps:

[0086] (1) Use short carbon fiber materials to mix materials, and obtain the skeleton layer through paving, water repelling, curing and fixing the fiber skeleton layer;

[0087] (2) Divide the water-conducting material into 10 times and scrape-coat it on the framework layer obtained in step (1), and vacuum-dry it at 95°C to obtain a composite layer;

[0088] (3) Scrape-coat the water-permeable material on ...

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Abstract

The invention relates to a gas diffusion layer, a preparation method thereof and a fuel cell. The gas diffusion layer comprises a fiber framework layer and a porous layer which are stacked, wherein the porous layer comprises a breathable material and a water guide material which are distributed at an interval. According to the gas diffusion layer provided by the invention, the fiber material is used as a framework layer support, the breathable material and the water guide material which are distributed on the plane in a staggered manner are used as the porous layer, the bipolar plate design can be synchronized for customized development, the production process is simple, customized development production matched with the shape of a bipolar plate flow field can be realized, the process development time is shortened, the production and preparation cost is saved, and the problems of membrane electrode flooding, non-uniform reaction gas transmission, large gas resistance of the fuel cell and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen fuel cells, and relates to a gas diffusion layer, in particular to a gas diffusion layer, a preparation method thereof and a fuel cell. Background technique [0002] Fuel cells use hydrogen as the anode and air or oxygen as the cathode. They have the characteristics of high energy conversion efficiency, long service life, mild reaction conditions, and environmental friendliness. They are known as the most promising power generation technology, especially It has broad application prospects in automobile power, mobile power supply and other aspects. The gas diffusion layer is an important part of the fuel cell membrane electrode, which plays the role of gas and moisture management. It is necessary to ensure that the proton exchange membrane has sufficient water, and at the same time, in order to prevent flooding, the generated water can be discharged in time. In the actual operation of the fuel c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/22
CPCH01M4/8657H01M4/8605H01M4/8807H01M8/22Y02E60/50Y02P70/50
Inventor 曹婷婷米新艳张克金马千里李军泽韩聪
Owner FAW JIEFANG AUTOMOTIVE CO
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