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A kind of preparation method of gas diffusion layer for proton exchange membrane fuel cell

A gas diffusion layer, proton exchange membrane technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low surface energy, uneven dispersion, and widespread concern of PTFE, and achieve improved electrical conductivity and air permeability. The degree of dispersion and the effect of improving battery performance

Active Publication Date: 2017-05-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface energy of PTFE is very low, resulting in poor dispersion stability in non-aqueous solvents.
Therefore, the PTFE in the microporous layer slurry obtained by using alcohol as a solvent is easy to coagulate and unevenly dispersed
Moreover, during the heat treatment process of the microporous layer, the agglomerated PTFE particles tend to form a large-area wrapped insulating area, which reduces the local conductivity and air permeability of the diffusion layer.
However, this issue has not attracted widespread attention from researchers.

Method used

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  • A kind of preparation method of gas diffusion layer for proton exchange membrane fuel cell
  • A kind of preparation method of gas diffusion layer for proton exchange membrane fuel cell
  • A kind of preparation method of gas diffusion layer for proton exchange membrane fuel cell

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Experimental program
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Effect test

Embodiment 1

[0023] According to the method of the present invention, weigh 60 mg of polyvinylpyrrolidone (PVP) and add it to 70 g of deionized water to form a uniform aqueous solution. Measure 5 ml of the aqueous solution, add 62.5 mg of acetylene black into it, and stir magnetically for 2 hours. The stirrer rotates at 1600 rpm, and then ultrasonically disperses for 30 minutes to form a uniform suspension, and then adds 500 mg of PTFE emulsion (5wt%) to the above suspension, and stirs evenly to obtain a microporous layer slurry. The above microporous layer slurry was evenly coated on one side of Toray carbon paper, dried and weighed, and then this step was repeated until the loading amount of carbon black reached 0.5 mg / cm 2 ; Then spray a low concentration of PTFE emulsion (0.25wt%) on the side of the carbon paper that is not coated with the microporous layer, so that the loading of PTFE reaches 1% of the mass of the carbon paper. Finally, the entire diffusion layer was sintered in a nit...

Embodiment 2

[0028] According to the method of the present invention, weigh 60 mg of polyvinylpyrrolidone (PVP) and add it to 70 g of deionized water to form a uniform aqueous solution. Measure 10 ml of the aqueous solution, add 62.5 mg of acetylene black into it, and stir magnetically for 1 hour. The stirrer rotates at 1600 rpm, and then ultrasonically disperses for 30 minutes to form a uniform suspension, and then adds 500 mg of PTFE emulsion (5wt%) to the above suspension, and stirs evenly to obtain a microporous layer slurry. The above microporous layer slurry was evenly coated on one side of Toray carbon paper, dried and weighed, and then this step was repeated until the loading amount of carbon black reached 0.5 mg / cm 2 ; Then spray a low concentration of PTFE emulsion (0.25wt%) on the side of the carbon paper that is not coated with the microporous layer, so that the loading of PTFE reaches 2% of the mass of the carbon paper. Finally, the entire diffusion layer was sintered in a nit...

Embodiment 3

[0033] According to the method of the present invention, weigh 60 mg of polyvinylpyrrolidone (PVP) and add it to 70 g of deionized water to form a uniform aqueous solution. Measure 10 ml of the aqueous solution, add 120 mg of acetylene black to it, magnetically stir for 5 hours, and stir The rotation speed of the machine was 1600 rpm, and then ultrasonic dispersion was performed for 30 minutes to form a uniform suspension, and then 960 mg of PTFE emulsion (5wt%) was added to the above suspension, and stirred evenly to obtain a microporous layer slurry. The above microporous layer slurry was uniformly coated on one side of three Toray carbon papers (8×8cm), dried and weighed, and then this step was repeated until the loading amount of carbon black on the surface of the three carbon papers reached 0.5 mg / cm 2 Then spray low-concentration PTFE emulsion on the uncoated microporous layer side of the three carbon papers, so that the loading of PTFE reaches 1%, 2%, and 3% of the car...

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Abstract

The invention relates to a preparation method for a gas diffusion layer of a proton exchange membrane fuel cell. The gas diffusion layer is composed of a support layer and a microporous layer, and the distribution of the water repellent in the microporous layer is uniform. The preparation method of the gas diffusion layer is as follows: uniformly disperse the conductive carbon black in deionized water added with a dispersant, and then add a water-repellent emulsion to form a uniform microporous layer slurry; apply the slurry evenly Cover one side of the porous conductive support layer, and then carry out hydrophobic treatment on the side of the support layer not coated with the microporous layer; finally, heat treatment to form a gas diffusion layer. Because the gas diffusion layer of the present invention uses deionized water as a solvent to prepare the microporous layer, the water-repellent agent can be uniformly dispersed in the microporous layer slurry, and then the carbon powder particles are easy to form a continuous electron transfer network, reducing the density of the diffusion layer. resistance, while improving its breathability.

Description

technical field [0001] The invention relates to a preparation method of a gas diffusion layer of a proton exchange membrane fuel cell, especially a preparation method of a microporous layer. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) core component membrane electrode assembly (MEA) is composed of gas diffusion layer, catalytic layer and proton exchange membrane. The gas diffusion layer (GDL) is located between the catalytic layer and the flow field, and its main function is to support the catalytic layer, collect current, and provide channels for the transport of reaction gases and product water. Among them, the drainage performance is particularly important, which affects the diffusion of the reaction gas and the discharge of the product water, thereby affecting the performance of the battery. Therefore, it is hoped that the diffusion layer has a suitable pore size and porosity, so as to discharge excess liquid water in the battery as much as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 李晓锦于书淳郝金凯邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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