A kind of gas diffusion layer and its preparation method and use

A technology of gas diffusion layer and microporous layer, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of increasing the complexity and cost of the battery system, and achieve excellent anti-reversal ability, stability of the overall structure and performance Good, reduce the effect of reverse polarity conditions

Active Publication Date: 2021-06-11
上海骥翀氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of gas diffusion layer and its preparation method and use
  • A kind of gas diffusion layer and its preparation method and use
  • A kind of gas diffusion layer and its preparation method and use

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 its preparation method and application. The preparation method of the gas diffusion layer includes: (1) adding a water-promoting electrolysis catalyst precursor to the microporous layer slurry to obtain the treated microporous layer slurry; (2) treating the treated microporous layer slurry in step (1) The microporous layer slurry is coated on the substrate, and dried in an inert atmosphere until the precursor of the water-promoting electrolysis catalyst is decomposed to obtain the gas diffusion layer; the microporous layer in the gas diffusion layer contains the water-promoting electrolysis catalyst and Loose and porous; the gas diffusion electrode and the fuel cell provided by the invention comprise the gas diffusion layer; the invention also provides a method for reducing the corrosion of the carbon carrier in the anode catalyst layer of the fuel cell under the reverse electrode working condition, by adding the gas to the microporous layer The slurry is mixed into the water-promoting electrolysis catalyst precursor to realize. The gas diffusion layer provided by the invention improves the electrolysis capacity of water on the surface of the electrode, slows down the corrosion of the carbon carrier in the catalyst layer on the surface of the electrode by the counter electrode, and prolongs the service life of the electrode.

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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Patent Type & Authority Patents(China)
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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