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Fuel cell gas diffusion layer, preparation method thereof, membrane electrode assembly and fuel cell

A gas diffusion layer and membrane electrode assembly technology, which is applied to fuel cells, battery electrodes, electrical components, etc., can solve the problems of inability to transmit reactive gases, lack of mesopores, large specific surface area, etc. The effect of low degree of mass polarization and good electrochemical performance

Pending Publication Date: 2021-07-20
SHANGHAI JAZZ NEW MATERIAL TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

The above-mentioned carbon materials are characterized by small particles, large specific surface area, and good electrical conductivity, but they do not have mesopores and cannot transmit reaction gases.

Method used

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  • Fuel cell gas diffusion layer, preparation method thereof, membrane electrode assembly and fuel cell
  • Fuel cell gas diffusion layer, preparation method thereof, membrane electrode assembly and fuel cell
  • Fuel cell gas diffusion layer, preparation method thereof, membrane electrode assembly and fuel cell

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preparation example Construction

[0038] Such as figure 2 As shown, it is a schematic flow chart of a method for preparing a gas diffusion layer provided by an embodiment of the present invention. The preparation method includes:

[0039] Step S11: Soak the base layer (31) of the gas diffusion layer in a hydrophobic agent solution, place it in an oven for heating, and optionally repeat this step several times, so that the content of the hydrophobic agent reaches the design range;

[0040] Step S12: On one side of the hydrophobically treated gas diffusion layer base layer (31), apply a microporous layer as a whole, and place it in an oven to heat to form a microporous layer. This step can be repeated several times, so that the microporous layer ( 32) The thickness reaches the design range;

[0041] Step S13: Place the gas diffusion layer treated in the previous step in an oven at 301° C. to 399° C. and heat to fully volatilize the remaining pore forming agent, dispersant and solution.

[0042] Such as imag...

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Abstract

The invention discloses a fuel cell gas diffusion layer, which comprises gas diffusion layer substrate layers (31) and microporous layers (32), the microporous layer comprises 1-80% by mass of a coralline-shaped or starfish-shaped or dendritic or convex-shaped carbon powder material which has a size profile of 50-300 nm, has mesopores with pore diameters of 2-50 nm inside, and is subjected to surface modification treatment. The microporous layer further comprises 10%-45% of a water repellent agent, 1%-79% of conductive particles and 1%-30% of cerium oxide particles. The gas diffusion layer has good gas transmission capability. The membrane electrode prepared by adopting the gas diffusion layer structure and the fuel cell stack assembled by adopting the gas diffusion layer structure can show good performance during high-current operation. The invention also discloses a related preparation method, a membrane electrode assembly and a fuel cell.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell gas diffusion layer, a preparation method, a membrane electrode assembly and a fuel cell. Background technique [0002] Fuel cell is one of the main power devices of new energy vehicles. At present, Mirai, the first commercialized fuel cell vehicle produced by Toyota Corporation of Japan, is already on the market, with a speed of up to 100km / h and a battery life of about 500km with one hydrogen refueling. But its cost is still expensive, and there is still a certain gap between performance, safety, life and user needs. Therefore, it is imminent to further study the internal characteristics of batteries, seek materials for reducing the cost of fuel cell vehicles, and methods to improve their performance and prolong their life. In addition to being used in the field of new energy vehicles, fuel cells also have huge market potential and very broad application prospe...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/1213H01M8/126
CPCH01M4/8807H01M8/126H01M4/861H01M8/1213Y02E60/50
Inventor 王晋
Owner SHANGHAI JAZZ NEW MATERIAL TECH CO LTD
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