Proton exchange membrane fuel cell gas diffusion layer microporous layer and preparation method thereof

A gas diffusion layer and proton exchange membrane technology, applied in solid electrolyte fuel cells, electrical components, battery electrodes, etc., can solve problems affecting gas transmission, slurry infiltration, electrode flooding, etc., and achieve uniform pore structure and gas transmission. Enhanced capacity and drainage capacity, good electrical conductivity

Pending Publication Date: 2022-01-28
WUXI WEIFU HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the microporous layer is prepared by the blade coating method, the slurry will penetrate into the macropores of the substrate and block the macropores of the substrate, which will affect the gas transmission and water discharge and cause the electrode to be flooded.

Method used

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  • Proton exchange membrane fuel cell gas diffusion layer microporous layer and preparation method thereof
  • Proton exchange membrane fuel cell gas diffusion layer microporous layer and preparation method thereof
  • Proton exchange membrane fuel cell gas diffusion layer microporous layer and preparation method thereof

Examples

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Embodiment 1

[0024] A method for preparing a microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell, comprising the following steps:

[0025] (1) Hydrophobic treatment of the substrate: impregnate the carbon paper with polytetrafluoroethylene emulsion, dry it in a 70°C oven for 30 minutes, and weigh it. Repeat the above operation several times and weigh until the polytetrafluoroethylene in the carbon paper The content is 5%, then roasted in a muffle furnace at 290°C for 30 minutes, and then heated to 350°C for 30 minutes;

[0026] (2) Mix 200g deionized water, 4g Triton X-100, 20g XC-72 carbon black, and 8.3g polytetrafluoroethylene emulsion with a mass fraction of 60%, stir it mechanically for 2 hours, and then carry out ultrasonic dispersion until To form a uniform slurry, the slurry is coated on the hydrophobically treated carbon paper by reverse roll, after coating, it is dried in an oven at 70°C for 30min, and baked in a muffle furnace at 290°C for 30min, a...

Embodiment 2

[0028] A method for preparing a microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell, comprising the following steps:

[0029] (1) Hydrophobic treatment of the substrate: impregnate the carbon paper with polyvinylidene fluoride emulsion, dry it in an oven at 120°C for 5 minutes, and weigh it. Repeat the above operation several times and weigh until the polyvinylidene fluoride in the carbon paper The content is 7%, and then roasted in a muffle furnace at 290°C for 30 minutes, and then heated to 350°C for 30 minutes;

[0030] (2) Mix 200g deionized water, 4g Triton X-100, 20g XC-72 carbon black, and 8.3g polyvinylidene fluoride emulsion with a mass fraction of 60%, stir them mechanically for 2 hours, and then carry out ultrasonic dispersion until A uniform slurry is formed, and the slurry is coated on the hydrophobically treated carbon paper by a forward-rotating roll. After coating, it is dried in an oven at 120°C for 30 minutes, and then baked in ...

Embodiment 3

[0032] A method for preparing a microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell, comprising the following steps:

[0033] (1) Hydrophobic treatment of the base material: impregnate the carbon cloth with polytetrafluoroethylene emulsion, dry it in a 70°C oven for 0.5h, and weigh it. Repeat the above operation several times and weigh until the polytetrafluoroethylene in the carbon cloth The ethylene content is 5%, and then roasted in a muffle furnace at 290°C for 30 minutes, and then heated to 350°C for 30 minutes;

[0034] (2) Mix 100g of deionized water, 100g of n-propanol, 4g of Triton X-100, 10g of XC-72 carbon black, 10g of carbon nanotubes, and 14.3g of polytetrafluoroethylene emulsion with a mass fraction of 60% , mechanically stirred for 2 hours, and then ultrasonically dispersed until a uniform slurry was formed. The slurry was coated on the carbon paper after water-repellent treatment by reverse roll, and dried in an oven at 70°C for ...

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a gas diffusion layer microporous layer of a proton exchange membrane fuel cell and a preparation method thereof. The preparation method comprises the following steps: dipping a base material in a water repellent for 0.5-5 minutes, then putting the base material in a drying oven at 50-120 DEG C, carrying out drying for 5-30 minutes, then carrying out weighing, repeating the operation for multiple times until the content of the water repellent in the base material is 5-10%, then carrying out roasting in a muffle furnace at 200-300 DEG C for 10-120 minutes, taking a conductive agent, a water repellent, a surfactant and a solvent as raw materials, and performing mechanical stirring and ultrasonic dispersion until uniform microporous layer slurry is formed; coating a substrate subjected to hydrophobic treatment with the microporous layer slurry by adopting a roller coating method, and then carrying out drying and roasting to form the gas diffusion layer. The roller type coating method is adopted, so the problems that microporous layer slurry permeates into the base material, large holes of the base material are blocked, and a transmission channel and a drainage channel of reaction gas are blocked are solved, the gas transmission capacity and the drainage capacity are enhanced, and the battery performance is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a microporous layer of a proton exchange membrane fuel cell gas diffusion layer and a preparation method thereof. Background technique [0002] The current methods for preparing the microporous layer mainly include screen printing, spraying and scraping. The surface of the microporous layer prepared by the screen printing method leaves a screen grid, and the traces of these mesh lines are usually the starting position of the degradation of the microporous layer, which will make the microporous layer fall off easily and reduce the durability of the microporous layer. The microporous layer prepared by the spraying method is only suitable for small-area preparation and cannot achieve large-scale production. Blade coating methods include blade coating and wire bar coating. When the microporous layer is prepared by the blade coating method, the slurry will penetrate i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M8/10
CPCH01M4/8807H01M4/8673H01M8/10Y02E60/50
Inventor 李叶涛张义煌许笑目陈杰吴楚李刚
Owner WUXI WEIFU HIGH TECH CO LTD
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