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Gas diffusion layer, preparation method thereof and fuel cell

A gas diffusion layer and slurry technology, used in fuel cells, battery electrodes, circuits, etc., can solve the problems affecting the performance and life of gas diffusion layers and fuel cells, PTFE condensation, poor coating consistency, etc., to improve performance and Long life, good flatness and uniform thickness distribution

Inactive Publication Date: 2019-11-29
浙江锋源氢能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is likely to cause problems such as PTFE condensation, uneven dispersion, uneven thickness, and poor coating consistency, thereby affecting the performance and life of the gas diffusion layer and fuel cells.

Method used

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

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preparation example Construction

[0031] Embodiments of the present invention provide a method for preparing a gas diffusion layer, which includes the following steps:

[0032] (1) Microporous layer slurry preparation step: prepare a mixed slurry containing conductive powder and hydrophobic agent.

[0033] Specifically, the conductive powder and the hydrophobic agent are added to the low-boiling alcohol-water mixed solvent according to the mass percentage of 55-85% and 10-30% respectively, and then ultrasonic, sheared, and pulverized to form a uniformly dispersed mixed slurry.

[0034] Preferably, the conductive powder is added into the alcohol-water mixed solvent and stirred evenly, and then an appropriate amount of hydrophobic agent emulsion is added dropwise therein. Ultrasonic, shear dispersed the slurry for 30-60 minutes.

[0035] Preferably, the conductive powder is preferably conductive carbon powder. Preferably, the conductive powder is one or more of XC-72 conductive carbon powder, BP2000 conductive...

Embodiment 1

[0049] 1) Add 50g of XC-72 conductive carbon powder to 10mL of 30% propanol solution by mass fraction and stir to obtain a dispersion; then add 20g of PTFE emulsion with a mass fraction of 30% to the dispersion, Then ultrasonication and shearing were performed successively for 30 min each to obtain a mixed slurry.

[0050] 2) Use an ultrasonic sprayer to spray the mixed slurry at a temperature of 100°C on the hydrophobically treated carbon paper at a speed of 1mL / min, and change the number of spraying times according to the solid content of the mixed slurry and the spraying flow rate until the carbon paper loading capacity (that is, the load of the support layer) reaches 0.5mg / cm 2 .

[0051] 3) Put the sprayed carbon paper in a vacuum oven, and sinter at a temperature of 300°C for 40 minutes at a high temperature to obtain a gas diffusion layer.

Embodiment 2

[0053] The difference between embodiment 2 and embodiment 1 is: the PTFE emulsion in step 1) is replaced by the copolymer FEP emulsion of tetrafluoroethylene and hexafluoropropylene.

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Abstract

The invention relates to a gas diffusion layer, a preparation method thereof and a fuel cell, and relates to the technical field of fuel cells. According to the mainly adopted technical scheme, the preparation method of the gas diffusion layer comprises the following steps: a microporous layer slurry preparation step, namely, preparing mixed slurry containing conductive powder and a water repellent agent; an ultrasonic spraying step, namely, spraying the mixed slurry on a supporting layer in an ultrasonic spraying manner; and a vacuum sintering treatment step, namely, carrying out vacuum sintering treatment on the supporting layer sprayed with the mixed slurry to obtain the gas diffusion layer. The method is mainly used for uniformly dispersing the micropore layer slurry on the supportinglayer, improving the dispersion uniformity of the conductive powder and the water repellent agent in the micropore layer on the supporting layer, and improving the performance and service life of thegas diffusion layer and the fuel cell.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a gas diffusion layer, a preparation method thereof, and a fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a new type of green energy technology. It has the advantages of high energy conversion efficiency, fast start-up at low temperature, and no pollution. It has broad application prospects in automobile power and small portable power generation equipment. The research on PEMFC has become a hot topic in the field of energy, and many developed countries are competing to develop this technology. [0003] As the most important part of PEMFC, membrane electrode (MEA) is mainly composed of proton exchange membrane (such as Nafion membrane), anode / cathode catalyst layer (CL), anode / cathode gas diffusion layer (GDL), and its characteristics directly affect PEMFC performance. The gas diffusion layer (GDL) plays a vital role in the MEA three-in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/0234H01M8/0245
CPCH01M4/8807H01M8/0234H01M8/0245Y02E60/50
Inventor 祝传贺战立俊沈润冯翌王海峰袁蕴超王利生
Owner 浙江锋源氢能科技有限公司
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