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Microporous layer slurry, gas diffusion layer, fuel cell and preparation method

A gas diffusion layer and microporous layer technology, applied in fuel cells, battery electrodes, circuits, etc., can solve problems such as shortening product life and inability to transmit gas

Active Publication Date: 2021-05-18
武汉理工氢电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Water will be generated during the operation of the fuel cell. If the water is not discharged in time, the water will block the pore structure of the microporous layer of the gas diffusion layer, resulting in the inability to transmit the gas required for the reaction.
In order to enhance the drainage and air permeability of the microporous layer, the commonly used method is to form large-diameter pore structures, such as cracks and perforations, in the process of preparing the microporous layer. However, these cracks, perforations and other large-diameter pore structures often bring life problems. , reduce product life

Method used

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  • Microporous layer slurry, gas diffusion layer, fuel cell and preparation method
  • Microporous layer slurry, gas diffusion layer, fuel cell and preparation method

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preparation example Construction

[0040] The embodiment of the present application also provides a method for preparing the above-mentioned microporous layer slurry, which includes the following steps:

[0041] (1) Proportionally disperse the hydrophobic agent, perfluorosulfonic acid polymer or its corresponding salt in a solvent formed by water and organic solvent to obtain a gel.

[0042] (2) Adding the carbon-based material into the gel, stirring, ball milling, and dispersing to obtain a microporous layer slurry. Usually, the stirring rate is 2000-3000rad / min, and the stirring time is 1-3h; the ball milling rate is 100-500rad / min, and the ball-milling time is 2-5h; the dispersion time is 1-3h, so as to ensure that the carbon-based material particles are uniform and uniform in the gel.

[0043] The embodiment of the present application also provides a method for preparing a gas diffusion layer, which includes the following steps:

[0044] 1. Hydrophobic treatment of the base layer (GB) for subsequent use. ...

Embodiment 1

[0054] This embodiment provides a gas diffusion layer and a fuel cell, which can be prepared according to the following preparation methods:

[0055] (1) The carbon paper is hydrophobized with the hydrophobic agent PTFE. The specific method is to place the carbon paper in the PTFE aqueous dispersion and soak it. The amount of PTFE is 10% of the mass of the carbon paper. It is heated to 100 ° C and treated for 10 minutes to obtain Hydrophobized carbon paper, as GB.

[0056] (2) Add carbon powder, PTFE powder and sulfonic acid resin salt to the hydroalcoholic solution (water: ethanol = 7:3), specifically, first add PTFE powder and sulfonic acid resin salt to the hydroalcoholic solution and ultrasonically disperse to obtain a gel Then add carbon powder to the gel, the mass ratio of carbon powder and water-alcohol solution is 1:9, the mass of PTFE powder is 25% of the mass of carbon powder, and the sulfonic acid resin salt is 5% of the mass of carbon powder , followed by stirring...

Embodiment 2

[0061] This embodiment provides a gas diffusion layer and a fuel cell, which can be prepared according to the following preparation methods:

[0062] (1) The carbon paper is subjected to hydrophobization treatment with a hydrophobizing agent PTFE, and the process is the same as in Example 1 to obtain a hydrophobization carbon paper.

[0063] (2) Add carbon powder, PTFE powder and sulfonic acid resin salt to the hydroalcoholic solution (water:ethanol=7:3), the mass ratio of carbon powder and hydroalcoholic solution is 1:5, and the mass of PTFE powder is carbon 20% of the powder mass, sulfonic acid resin salt is 10% of the carbon powder mass, then stirred at 2500rad / min for 1.5h, ball milled at 300rad / min for 3h, and ultrasonically dispersed for 60 minutes to obtain a microporous layer slurry.

[0064] (3) Coating the microporous layer slurry treated in step (2) on the hydrophobized carbon paper in (1), the treatment process is the same as in Example 1 to obtain a gas diffusion ...

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Abstract

The embodiment of the invention provides microporous layer slurry, a gas diffusion layer, a fuel cell and a preparation method, and relates to the field of fuel cells. The microporous layer slurry comprises a water repellent agent, a gel formed by a perfluorosulfonic acid polymer or a corresponding salt thereof and a solvent, and a carbon-based material dispersed in the gel, the mass ratio of the carbon-based material to the solvent is 1: (3-20), the mass of the water repellent agent is 20-30% of the mass of the carbon-based material, and the mass of the perfluorosulfonic acid type polymer or the corresponding salt is 2-300% of the mass of the carbon-based material. The microporous layer slurry, the gas diffusion layer and the fuel cell provided by the embodiment of the invention are high in gas transmission capability, and the service life of a product is not influenced.

Description

technical field [0001] The present application relates to the field of fuel cells, in particular, to a microporous layer slurry, a gas diffusion layer, 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 vital part of the proton exchange membrane fuel cell system, which includes the proton exchange membrane, catalytic layer and gas diffusion layer (GDL for short), generally composed of the base layer (GB ) and microporous layer (MPL), the base layer (GB) mainly plays the role of support and current collection, while the microporous layer (MPL) is used to reduce the contact resistance between the catalytic layer and the gas diffusion layer and conduct ef...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/1007
CPCH01M4/8605H01M4/8652H01M4/8807H01M8/1007H01M2008/1095Y02E60/50
Inventor 陈峰潘牧田明星刘素芬尹红兵吴天涯
Owner 武汉理工氢电科技有限公司
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