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Gas diffusion layer and preparation method thereof and application thereof

A technology of gas diffusion layer and conductive layer, which is applied in the direction of electrical components, climate sustainability, final product manufacturing, etc. It can solve the problems of unable to prevent the transmission of moisture, large pore size of the gas transmission layer, which is not conducive to application, etc., to reduce hydrophobicity Effects of processing technology, lower application cost, and good electrical conductivity

Pending Publication Date: 2020-08-07
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation method of the gas diffusion layer provided by this patent is relatively simple, the carbon paper and carbon cloth used are brittle and easy to fold, which will have an adverse effect on the gas diffusion layer.
CN102856567A discloses an integrated renewable fuel cell gas diffusion layer and its preparation method, using non-conductive organic synthetic fiber cloth as the support of the diffusion layer, and constructing a conductive corrosion-resistant metal / metal oxide network on it, It is filled into the pores of organic fibers, combined with certain hydrophobic agents and binders, so that the diffusion layer can achieve suitable hydrophilic and hydrophobic properties and construct a suitable pore structure to ensure the mass transfer balance of URFC under different working modes; the patent provides The gas transport layer has a large pore size, which cannot prevent the transmission of moisture; and it adds metal particles, which is heavy and not conducive to application

Method used

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  • Gas diffusion layer and preparation method thereof and application thereof
  • Gas diffusion layer and preparation method thereof and application thereof
  • Gas diffusion layer and preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A gas diffusion layer, the preparation method is as follows:

[0068] (1) Select polyvinyl alcohol non-woven fabric, and use conductive composite material (Vulcan XC-72 and polytetrafluoroethylene (PTFE) mixed in a mass ratio of 1:2.5) to bond polyvinyl alcohol non-woven fabric to obtain porous support layer;

[0069] Among them, the thickness of the polyvinyl alcohol non-woven fabric is 190 μm, the porosity is 75%, and the average pore diameter is 25 nm;

[0070] Wherein, the mass ratio of the polyvinyl alcohol non-woven fabric and the conductive composite material is 3.5:0.8.

[0071] (2) Spray the microporous conductive layer solution on the surface of the porous support layer, so that the loading capacity is 20mg / cm 2 , let stand for 30min, then dry in a vacuum oven at 120°C for 2h, and sinter in a nitrogen-filled oven at 350°C for 1h to obtain a gas diffusion layer;

[0072] Wherein, the microporous conductive layer solution is Vulcan XC-72:polytetrafluoroethyle...

Embodiment 2

[0074] The difference from Example 1 is that the conductive composite material of this example is mixed with Vulcan XC-72 and polytetrafluoroethylene (PTFE) in a mass ratio of 1:3, and the microporous conductive layer solution is Vulcan XC-72 : polytetrafluoroethylene: ammonium carbonate: water=1:0.7:0.2:22.

Embodiment 3

[0076] The difference from Example 1 is that the conductive composite material of this example is mixed with Vulcan XC-72 and polytetrafluoroethylene (PTFE) at a mass ratio of 1:3.

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Abstract

The invention provides a gas diffusion layer as well as a preparation method thereof and application thereof. The gas diffusion layer comprises a porous support layer and a microporous conductive layer, wherein the framework material of the porous support layer is polymer fiber. The gas diffusion layer provided by the invention has good gas diffusivity and can block moisture transmission; meanwhile, the gas diffusivity provided by the invention is relatively good in flexibility, so that the fragility of a traditional material is avoided; meanwhile, the polymer fibers are low in cost, and the application cost of the gas diffusion layer can be reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and relates to a gas diffusion layer and its preparation method and application. Background technique [0002] Compared with pure electric vehicles, hydrogen fuel cell vehicles have the advantages of short hydrogenation time and long cruising range. Hydrogen energy is a renewable and clean energy with the advantages of wide sources, zero pollution, zero emissions, and no secondary pollution. It is suitable for ongoing , large-scale reserves. As a major hydrogen producing country in the world, my country adopts a two-pronged approach to hydrogen production from traditional energy sources and hydrogen production from renewable energy sources. The hydrogen transportation system and hydrogen refueling stations are also becoming more and more mature. According to H 2 According to the statistics report on global hydrogen refueling stations released by stations.org, by the end of 2018, th...

Claims

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Application Information

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IPC IPC(8): H01M8/023H01M8/0241H01M8/0245
CPCH01M8/023H01M8/0241H01M8/0245Y02E60/50Y02P70/50
Inventor 曹婷婷米新艳崔新然马千里王茁李军泽
Owner FAW JIEFANG AUTOMOTIVE CO
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