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Gas diffusion layer and preparation method and application thereof

A technology of gas diffusion layer and gas diffusion electrode, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of increasing the complexity and cost of the battery system, improve the ability of exhaust and drainage, improve the catalytic ability, improve The effect of mass transfer capacity

Active Publication Date: 2020-02-11
上海骥翀氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The fuel cell can effectively avoid the electrode corrosion caused by the reverse polarity of the single cell and increase the service life of the battery, but the introduction of the diode increases the complexity and cost of the battery system

Method used

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  • Gas diffusion layer and preparation method and application thereof
  • Gas diffusion layer and preparation method and application thereof
  • Gas diffusion layer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This embodiment provides a method for preparing a gas diffusion layer, comprising the following steps:

[0073] (1) Add acetylene black and polytetrafluoroethylene to the aqueous solution of polyvinylpyrrolidone, stir and ultrasonically disperse for 60 minutes, and the ultrasonic power used is 800W to obtain the microporous layer slurry, then add ruthenium chloride and stir to obtain The microporous layer slurry after treatment, the loading amount of acetylene black in the microporous layer of the gas diffusion layer is controlled to be 3mg / cm 2 , the quality of the polytetrafluoroethylene is 25% of the mass of acetylene black, and the mass ratio of the ruthenium chloride to the acetylene black is 0.08;

[0074] (2) Coat the microporous layer slurry treated in step (1) onto carbon paper so that the coating thickness is 45 μm, raise the temperature to 500° C. in nitrogen and keep it for 60 minutes until the ruthenium chloride is decomposed into a simple substance Ruthen...

Embodiment 2

[0077] This embodiment provides a method for preparing a gas diffusion layer, comprising the following steps:

[0078] (1) Graphite powder and polytetrafluoroethylene are added in the aqueous solution of polyvinylpyrrolidone, carry out stirring, ultrasonic dispersion 80 minutes, used ultrasonic power is 900W, obtain microporous layer slurry, then add ruthenium chloride, stir, obtain The microporous layer slurry after treatment, the loading capacity of the graphite powder in the microporous layer of the gas diffusion layer is controlled to be 8 mg / cm 2 , the quality of polytetrafluoroethylene is 25% of graphite powder quality, and the mass ratio of described ruthenium chloride and graphite powder is 0.02;

[0079] (2) Spin-coat the microporous layer slurry treated in step (1) onto carbon paper so that the coating thickness is 60 μm, raise the temperature to 600° C. in nitrogen and keep it for 90 minutes until the ruthenium chloride is decomposed into elemental ruthenium and hy...

Embodiment 3

[0081] This embodiment provides a method for preparing a gas diffusion layer, comprising the following steps:

[0082] (1) Add activated carbon and polytetrafluoroethylene to the aqueous solution of polyvinylpyrrolidone, stir and ultrasonically disperse for 20 minutes. The ultrasonic power used is 800W to obtain a microporous layer slurry, then add ruthenium chloride and stir to obtain a treated After the microporous layer slurry, the loading amount of activated carbon in the microporous layer of the gas diffusion layer is controlled to be 0.5 mg / cm 2 , the quality of the polytetrafluoroethylene is 25% of the activated carbon quality, and the mass ratio of the ruthenium chloride to the activated carbon is 0.1;

[0083] (2) Spin-coat the microporous layer slurry treated in step (1) onto the mesh titanium substrate so that the coating thickness is 10 μm, raise the temperature to 500 ° C in nitrogen and keep it for 30 minutes until the ruthenium chloride decomposes The gas diffu...

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Abstract

The invention relates to a gas diffusion layer and a preparation method and application thereof. The preparation method of the gas diffusion layer comprises steps that (1) water electrolysis promotingcatalyst precursor is added into microporous layer slurry to obtain treated microporous layer slurry; (2) the microporous layer slurry treated in the (1) is coated on a substrate, and dried in an inert atmosphere till the water electrolysis promoting catalyst precursor is decomposed to obtain a gas diffusion layer; a microporous layer in the gas diffusion layer contains the water electrolysis promoting catalyst and is loose and porous; a gas diffusion electrode and a fuel cell provided by the invention comprise the gas diffusion layer. The invention further provides a method for reducing corrosion of a carbon carrier in an anode catalyst layer of the fuel cell under the antipole working condition. The method is realized by mixing the water electrolysis promoting catalyst precursor into the micropore layer slurry. The method is advantaged in that the electrolysis capacity of the water on the surface of the electrode is improved, corrosion of an antipole to the carbon carrier in the catalyst layer on the surface of the electrode is slowed down, and the service life of the electrode is prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a gas diffusion layer and its preparation method and application. Background technique [0002] A fuel cell is a device that directly converts chemical energy stored in fuel and oxidant into electrical energy, because it has a wide range of fuel sources, is clean, environmentally friendly, is not limited by the Carnot cycle, has high energy conversion efficiency, and has strong modular structure flexibility. , Centralized power supply can also be decentralized power supply and other advantages, in line with the requirements of sustainable development of the environment and resources, so it is highly valued. Fuel cells have broad application prospects in power stations, electric vehicles, aerospace, submarines, and space power supplies. Especially in recent years, they have been successfully applied to electric vehicles and are considered to be a power source that can replace i...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/8807H01M4/9083H01M4/926Y02E60/50
Inventor 付宇迟军
Owner 上海骥翀氢能科技有限公司
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