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Fuel cell gas diffusion layer and preparation method thereof

A gas diffusion layer and fuel cell technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve the problems of fuel cell cost reduction, high cost, and uneven pore size distribution, and achieve stable diffusion layer structure and uniform pore size distribution , the effect of good air permeability

Inactive Publication Date: 2019-10-08
FAW JIEFANG AUTOMOTIVE CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The structure of the gas diffusion layer prepared by the prior art method is unstable, the pore size distribution is not uniform enough, the cost is high, and the gas permeability, drainage and electrical conductivity are also unstable, so it is not suitable for large-scale production of fuel cells and reduces the cost of fuel cells

Method used

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  • Fuel cell gas diffusion layer and preparation method thereof
  • Fuel cell gas diffusion layer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] The carbon black powder adopts acetylene black, the dispersant adopts AEO-9, plus deionized water, and it is mixed uniformly according to a certain proportion. The amount of dispersant accounts for 20% of the mass percentage of carbon black. The mixing method includes ultrasound; ensure that the carbon black particles are 100-1100nm. The amount of carbon black powder is 15% of the mass percentage of the entire system.

[0022] Add the PTFE emulsion uniformly to the above-mentioned carbon black powder dispersion system, and continue to mix for 3.0 hours; the content of PTFE in the system is 10% of the mass percentage of carbon black; put the carbon paper into the above-mentioned dispersion system and soak for 16 minutes, and take it out Dry it and put it in a drying oven at 50-150°C for 50 minutes to obtain a carbon paper loaded with carbon black and PTFE. The above-mentioned carbon paper was sintered at 390°C for 45 minutes; the sintering method was oven.

[0023] A method...

Embodiment 2

[0026] The carbon black powder adopts activated carbon black. The carbon black powder is uniformly dispersed in deionized water (23% by mass), and a certain amount of dispersant Tween-60 is added to the system, and the amount of dispersant accounts for 10% of the mass percentage of carbon black. , To obtain a uniformly distributed slurry. Then, add PVDF emulsion to the above slurry, the content of PVDF in the system is 25% of the mass percentage of carbon black, and continue to stir for 2.5h, put the carbon cloth into the above slurry, soak for 16min, take it out to dry, and put it in Dry in a drying oven at 150°C for 60 minutes to obtain a carbon cloth loaded with carbon black and PVDF.

[0027] Then put the carbon cloth into the above-mentioned slurry and repeat the above-mentioned steps. And finally get a carbon black loading of 0.5-3mg / cm 2 The above carbon cloth is sintered at 350°C for 60 minutes.

[0028] A method for preparing a fuel cell gas diffusion layer, the specific...

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Abstract

The invention discloses a fuel cell gas diffusion layer and a preparation method thereof and belongs to the technical field of a fuel cell. The method is characterized in that the carbon black powder,the deionized water and dispersant are uniformly mixed in a certain ratio to obtain a carbon black powder dispersion system; polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF) emulsionis uniformly added to the carbon black powder dispersion system, stirred and mixed, carbon paper or carbon cloth is then immersed in the obtained dispersion system, taken out, dried and dried in a drying box, and lastly, sintering is carried out under 150-390 DEG C to obtain the fuel cell gas diffusion layer. The method is advantaged in that the prepared diffusion layer structure is more stable, pore size distribution is more uniform, cost is reduced, good gas permeability, drainage and electrical conductivity are achieved, the method is suitable for large-scale production of fuel cells, and cost of the fuel cells is reduced.

Description

Technical field [0001] The invention belongs to the technical field of fuel cells, and specifically relates to a fuel cell gas diffusion layer and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell is a type of fuel cell. The PEMFC electrode in the proton exchange membrane battery is a porous gas diffusion electrode, which is generally composed of a catalytic layer and a diffusion layer. The diffusion layer first plays a role of supporting the catalytic layer. The reaction gas needs to pass through the diffusion layer to reach the catalytic layer to participate in the reaction, so the diffusion layer should be conducive to mass transfer. The diffusion layer should also be a good conductor of electricity and heat. Therefore, the preparation method of the gas diffusion layer is very important. [0003] The structure of the gas diffusion layer prepared by the prior art method is unstable, the pore size distribution is not uniform enough,...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/0234
CPCH01M4/8807H01M8/0234Y02P70/50Y02E60/50
Inventor 马千里曹婷婷米新艳
Owner FAW JIEFANG AUTOMOTIVE CO