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Gas diffusion layer, membrane electrode assembly, fuel cell and preparation method of gas diffusion layer

A gas diffusion layer and dispersion technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve the problems that the pore-forming agent is difficult to control the pore-forming uniformity, impurities remain, and the pore-forming agent cannot be completely removed.

Inactive Publication Date: 2021-04-23
武汉理工氢电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is easy to create uneven pores by adding a pore-forming agent, mainly because it is difficult to control the uniformity of pore-forming and the pore size distribution when using a pore-forming agent; and the pore-forming agent cannot be completely removed, and there is a problem of residual impurities. Fuel cells are highly sensitive to impurities, and trace impurities will also affect the long-term use of fuel cells

Method used

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preparation example Construction

[0031] First, the embodiment of the present application provides a method for preparing a gas diffusion layer, which includes the following steps:

[0032] Step 1, prepare the base layer (GB), the base layer can be self-made or ready-made.

[0033] In the embodiment of this application, carbon paper or carbon cloth is usually used as the base layer, and the base layer is used after hydrophobizing treatment, which is mainly obtained by hydrophobizing the carbon paper or carbon cloth with hydrophobes. Optional Generally, the amount of the hydrophobe used in the hydrophobizing treatment is 5wt%-20wt% of the base layer. Among them, the hydrophobe can be but not limited to polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), for example, the hydrophobe is a mixture of PTFE, PVDF or PTFE and PVDF; the amount of the hydrophobe is carbon paper Or 5wt%-20wt% of the carbon cloth, such as 5wt%, 8wt%, 10wt%, 12wt%, 15wt%, 16wt%, 20wt%, or an intermediate value between any two ...

Embodiment 1

[0048] This embodiment provides a gas diffusion layer and a corresponding membrane electrode assembly, which are prepared according to the following preparation method:

[0049] Carbon paper is treated with PTFE (PTFE accounts for 20% of the total amount of carbon paper and PTFE) for hydrophobic treatment, and the base layer (GB) is obtained after heat treatment at 120°C for 30 minutes; carbon powder and PTFE are dispersed in deionized water and ethanol (mass In a mixed solvent with a ratio of 1:1), wherein the mass fraction of carbon powder is 50wt%, and the mass fraction of PTFE is 20wt% of carbon powder, to obtain a dispersed mixture.

[0050] The dispersion mixture was uniformly covered on the surface of the base layer by spraying to form a 60 μm thick covering layer, and dried at 50° C. until the solid content of the covering layer on the surface of the base layer was 70 wt % to obtain a pretreatment layer.

[0051] Cool the pretreatment layer at -20°C for 2 hours, and th...

Embodiment 2

[0054] This embodiment provides a gas diffusion layer and a corresponding membrane electrode assembly, which are prepared according to the following preparation method:

[0055] The carbon paper was treated with PTFE for hydrophobic treatment, and the base layer (GB) was obtained after heat treatment at 120°C for 30 minutes; the carbon powder and PTFE were dispersed in a mixed solvent of deionized water and tert-butanol (mass ratio 1:1), in which The mass fraction of the carbon powder is 50wt%, and the mass of PTFE is 20wt% of the carbon powder to obtain a dispersed mixture.

[0056] The dispersion mixture was uniformly covered on the surface of the base layer by spraying to form a covering layer, and dried at 50° C. until the solid content of the covering layer on the surface of the base layer was 80 wt%, to obtain a pretreatment layer.

[0057] The pretreatment layer was cooled at -10°C for 1 hour, and then heat-treated at 400°C for 60 minutes to obtain the gas diffusion lay...

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Abstract

The embodiment of the invention provides a gas diffusion layer, a membrane electrode assembly, a fuel cell and a preparation method of the gas diffusion layer, and relates to the field of fuel cells. The preparation method of the gas diffusion layer mainly comprises the steps that the surface of the substrate layer is evenly covered with a dispersion mixture to form a covering layer, the dispersion mixture comprises a carbon material, a hydrophobic substance, water and an organic solvent, and the solid content of the covering layer is controlled to range from 50 wt% to 99 wt% to obtain a pretreatment layer; and the pretreatment layer is cooled until the solvent in the covering layer is solidified, and then heat treatment is carried out until the solvent in the covering layer volatilizes. Pores of the microporous layer in the gas diffusion layer are uniform, almost no impurity is left, and the product performance is good.

Description

technical field [0001] The present application relates to the field of fuel cells, in particular to a gas diffusion layer, a membrane electrode assembly, a fuel cell and a preparation method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC for short) has the advantages of environmental protection, high energy density, high power generation efficiency, and fast start-up speed, and is considered to be one of the most potential future vehicle power sources. Membrane Electrode Assemblies (MEA for short) is a crucial part of a proton exchange membrane fuel cell, which includes a proton exchange membrane, a catalytic layer and a gas diffusion layer (Gas Diffusion Layer, GDL for short). The gas diffusion layer is generally composed of a base layer (GB) and a microporous layer (MPL). effective water management. At present, an important development direction of fuel cells is low humidification and high current density, followed by higher and higher requireme...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86H01M8/1004
CPCH01M4/8605H01M4/8807H01M8/1004H01M2008/1095Y02E60/50
Inventor 段奔潘牧田明星刘素芬陈峰钟青
Owner 武汉理工氢电科技有限公司
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