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Fuel cell membrane electrode ionomer pretreatment method

A fuel cell membrane, ionomer technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problem of unfavorable catalytic layer high-activity reaction interface construction and strength, affecting the two-phase distribution of ionomer and catalyst, and inability to ionomerize Dispersion and shape regulation, etc., to prevent air mixing, short dispersion time, and avoid air bubbles

Pending Publication Date: 2022-03-15
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fuel cell membrane electrode ionomer pretreatment method to solve the problem that the ionomer cannot be efficiently dispersed and morphologically controlled in the existing design specifications, which affects the two-phase distribution of the ionomer and the catalyst, and then It is not conducive to the construction and strength of the highly active reaction interface of the catalytic layer, and ultimately affects the performance and life of the membrane electrode.

Method used

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  • Fuel cell membrane electrode ionomer pretreatment method
  • Fuel cell membrane electrode ionomer pretreatment method

Examples

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Effect test

Embodiment 1

[0042] A fuel cell membrane electrode ionomer pretreatment method, comprising the following steps:

[0043] (1) Weigh 1 part of the ionomer dispersion and place it in a beaker, weigh 10 parts of pure water and 3 parts of ethanol, add the ionomer dispersion and stir to mix evenly;

[0044] (2) Put the premixed ionomer dispersion in a closed high-speed shearing machine, turn on the cooling system, maintain the slurry temperature at 25°C, shear the line speed at 20m / s, and shear for 5 minutes, and the process is complete Pretreatment of ionomers.

[0045] (3) then the pretreated ionomer is mixed with catalyst, water, and ethanol, and the mass ratio of each component is: 1 part of catalyst, 10 parts of water, 10 parts of ethanol, 4 parts of ionomer; The material was dispersed by ultrasonic wave for 20 minutes, the ultrasonic power was 500W, and the temperature of the slurry was controlled at 25°C. That is, the desired catalyst slurry is prepared.

Embodiment 2

[0047] A fuel cell membrane electrode ionomer pretreatment method, comprising the following steps:

[0048] (1) Weigh 1 part of the ionomer dispersion and place it in a beaker, weigh 10 parts of pure water and 3 parts of n-propanol, add the ionomer dispersion and stir to mix evenly;

[0049] (2) Put the premixed ionomer dispersion in a closed high-speed shearing machine, turn on the cooling system, maintain the slurry temperature at 25°C, the shearing line speed at 20m / s, and the shearing time for 2 minutes, and the process is completed Pretreatment of ionomers.

[0050] (3) Then the pretreated ionomer is mixed with catalyst, water, and n-propanol, and the mass ratio of each component and the slurry dispersion process are consistent with Example 1. That is, the desired catalyst slurry is prepared.

Embodiment 3

[0052] A fuel cell membrane electrode ionomer pretreatment method, comprising the following steps:

[0053] (1) Weigh 1 part of the ionomer dispersion and place it in a beaker, weigh 10 parts of pure water and 2 parts of ethanol, add the ionomer dispersion and stir to mix evenly;

[0054] (2) Put the premixed ionomer dispersion in a closed high-speed shearing machine, turn on the cooling system, maintain the slurry temperature at 25°C, the shearing line speed at 30m / s, and the shearing time for 5 minutes, and the process is complete Pretreatment of ionomers.

[0055] (3) Then the pretreated ionomer is mixed with catalyst, water, and ethanol, and the mass ratio of each component and the slurry dispersion process are consistent with Example 1. That is, the desired catalyst slurry is prepared.

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Abstract

The invention discloses a fuel cell membrane electrode ionomer pretreatment method, and belongs to the technical field of fuel cells, and the method comprises the following steps: S1, weighing 1 part of an ionomer dispersion liquid, placing the ionomer dispersion liquid in a beaker, weighing 10 parts of pure water and 2-4 parts of an alcohol solvent, adding the pure water and the alcohol solvent into the ionomer dispersion liquid, and uniformly stirring and mixing the ionomer dispersion liquid and the alcohol solvent with 2-3 carbons; s2, placing the premixed ionomer dispersion liquid in a closed high-speed shearing machine, starting a cooling system, and shearing to complete pretreatment of the ionomer; and S3, mixing the pretreated ionomer with a catalyst, water and an alcohol solvent, and carrying out dispersion treatment on the slurry by adopting ultrasonic waves to prepare the required catalyst slurry.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a method for pretreatment of fuel cell membrane electrode ionomers. Background technique [0002] The catalytic layer of the membrane electrode is the core place where the electrochemical reaction of the fuel cell occurs, and it is also a key area that determines the power density of the membrane electrode. The catalytic layer is jointly constructed by a platinum catalyst and a proton conductor ionomer, and has a microporous structure in a micro-nano scale. In the catalytic layer, only when the catalyst platinum particles are in contact with the ionomer, and are jointly exposed to the position where hydrogen and oxygen molecules can diffuse, such as the surface of the hole, to form a gas-liquid-solid three-phase reaction interface, can the hydrogen-oxygen electrolysis The chemical reaction proceeds efficiently. [0003] The core role of ionomer in the membrane el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M4/88
CPCH01M8/1004H01M4/88Y02E60/50
Inventor 李婷谢光有朱磊锋姚敏翾孔禹刘鹏
Owner DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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