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Preparation method for fuel cell gas diffusion layer with hydrophobicity

A gas diffusion layer and fuel cell technology, applied to electrical components, battery electrodes, circuits, etc., can solve the problems of high processing temperature, long processing time, and high production cost in the production process, and achieve simple process processing and avoid high-temperature processing. Effect

Active Publication Date: 2019-04-05
武汉氢能与燃料电池产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation method of gas diffusion layer is based on porous carbon fiber material and polytetrafluoroethylene emulsion as hydrophobic agent, which requires high temperature treatment (about 400 ℃) to make polytetrafluoroethylene melt and flow on the hole wall of porous carbon fiber material to hydrophobic The polytetrafluoroethylene fiber or film has problems such as high processing temperature and long processing time, which lead to high production cost of this production process.

Method used

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  • Preparation method for fuel cell gas diffusion layer with hydrophobicity
  • Preparation method for fuel cell gas diffusion layer with hydrophobicity
  • Preparation method for fuel cell gas diffusion layer with hydrophobicity

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Completely immerse the carbon fiber material (TGP~H~060 from Toray, with a thickness of 190 μm and a porosity of 78%) in furfuryl alcohol solvent;

[0025] (2) The carbon fiber material is taken out of the furfuryl alcohol solvent and dried at a temperature of 80°C for about 5 minutes;

[0026] (3) Weigh 5g of carbon powder (Cabot Vulcan XC~72R, the particle size is about 30nm, and the specific surface area is about 250m 2 / g), 30g furfuryl alcohol, 30g water and ultrasonically mixed for 30 minutes to obtain microporous layer slurry;

[0027] (4) The microporous layer slurry is coated on one side of the hydrophobically treated carbon fiber material, and dried at a temperature of 80°C for about 5 minutes to obtain a gas diffusion layer.

Embodiment 2

[0029] (1) Completely immerse the carbon fiber material (TGP~H~090 of Toray Company, thickness 280 μm, porosity 78%) in a mixed solvent of furfural and bisfurfuryl alcohol (mass ratio 1:1);

[0030] (2) The carbon fiber material is taken out from the mixed solvent of furfural and difurfuryl alcohol, and dried at a temperature of 150°C for about 5 minutes;

[0031] (3) Weigh 5g of carbon powder (Ketjenblack EC-300J from Kejen Carbon Black Company, the particle size is about 50nm, and the specific surface area is about 250m 2 / g), 30g of a mixed solvent of furfural and difurfuryl alcohol (mass ratio 1:1), 30g of water and ultrasonic for 30 minutes to prepare the microporous layer slurry;

[0032] (4) The microporous layer slurry is coated on one side of the hydrophobically treated carbon fiber material, and dried at a temperature of 60°C for about 30 minutes to obtain a gas diffusion layer.

Embodiment 3

[0034] (1) Completely impregnate the carbon fiber material (GDS310 from Carbon Energy Company, with a thickness of 310 μm and a porosity of 77%) in a mixed solvent of furfuryl alcohol, furfural, and difurfuryl alcohol (mass ratio 1:1:1);

[0035] (2) The carbon fiber material is taken out from the mixed solvent of furfural and difurfuryl alcohol, and dried at a temperature of 150°C for about 5 minutes;

[0036] (3) Weigh 5g carbon powder (Cabot FCX80, the particle size is about 100nm, the specific surface area is about 800m 2 / g), 30g of furfuryl alcohol, furfural and bisfurfuryl alcohol were mixed and dissolved (mass ratio 1:1:1), 30g of water was ultrasonically mixed for 30 minutes to prepare the microporous layer slurry;

[0037] (4) The microporous layer slurry is coated on one side of the hydrophobically treated carbon fiber material, and dried at a temperature of 150°C for about 5 minutes to obtain a gas diffusion layer.

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Abstract

The invention discloses a preparation method for a fuel cell gas diffusion layer with hydrophobicity. The preparation method comprises the steps of performing hydrophobic treatment on a porous carbonfiber substrate in a hydrophobic solution; performing thermal treatment on the porous carbon fiber substrate for 5-30 minutes under 60-150 DEG C after hydrophobic treatment; preparing micropore layerpaste, wherein the micropore layer paste is prepared by mixing a hydrophobing agent, carbon black particle and water; and coating the micropore layer paste at one side of the porous carbon fiber substrate, and performing thermal treatment for 5-30 minutes under 60-150 DEG C to obtain the fuel cell gas diffusion layer with hydrophobicity. The preparation method has the advantages of economy, rapidness and high production efficiency.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a method for preparing a hydrophobic fuel cell gas diffusion layer. Background technique [0002] Fuel cells have the advantages of high power density, high energy conversion efficiency and environmental friendliness. They are the most promising power source for zero-pollution and zero-emission electric vehicles. This makes them an international high-tech competition in today's global energy crisis and deteriorating environment. one of the hotspots. [0003] A fuel cell is a device that directly converts the chemical energy of fuel and oxidant into electrical energy. The biggest feature of this device is that its energy conversion efficiency is not limited by the "Carnot cycle", its energy conversion efficiency is as high as 60% to 80%, and its actual use efficiency is 2 to 3 times that of ordinary internal combustion engines. It has the advantages of diversification, envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCH01M4/8807Y02E60/50
Inventor 夏丰杰王傲裴波叶东浩况方舟
Owner 武汉氢能与燃料电池产业技术研究院有限公司
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