A kind of preparation method of fuel cell CCM membrane electrode

A fuel cell, membrane electrode technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as affecting gas mass transfer process, and achieve the effect of improving battery performance, reducing adhesion, and improving water management problems

Active Publication Date: 2020-10-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the CCM is further pressed with the gas diffusion layer to form a membrane electrode, an interface will be formed between the catalytic layer and the microporous layer, and liquid water will easily accumulate at this interface, thereby affecting the gas mass transfer process.

Method used

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  • A kind of preparation method of fuel cell CCM membrane electrode
  • A kind of preparation method of fuel cell CCM membrane electrode
  • A kind of preparation method of fuel cell CCM membrane electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0023] according to figure 1 In the process shown, a piece of aluminum foil with a thickness of about 20 microns is preferred, wipe it clean with alcohol cotton and lay it flat. The size of the aluminum foil is 5cm*5cm. Weigh 25mg of XC-72 carbon powder, add 1ml of water and 5ml of ethanol, mix well, spray it on the surface of aluminum foil, and dry it at 80°C to form a transition layer. Then weigh 20 mg of 50% Pt / C catalyst, disperse it with 10 ml of ethanol, add 160 mg of 5% Nafion solution, ultrasonically vibrate evenly, spray it on the surface of the transition layer, and dry it at 90° C. to form a catalytic layer.

[0024] Take a proton exchange membrane with a thickness of 50 microns, cut two small pieces with an area of ​​2cm*2.5cm from the above-mentioned sprayed sheet, clamp them on both sides of the proton exchange membrane oppositely, and clamp them with a thin metal plate Then put it in a hydraulic press at 140°C, and control the pressure on the surface of the mem...

Embodiment 2

[0028] according to figure 1 In the process shown, a tetrafluoromembrane with a thickness of about 50 microns is preferred, wiped clean with alcohol cotton and paved. The size of the tetrafluoromembrane is 5cm*5cm. Weigh 25mg of graphite powder with a particle size of about 50nm, add 1ml of water and 5ml of ethanol, mix well, spray it on the surface of the PTFE membrane, and dry it at 90°C to form a transition layer. Then weigh 20 mg of Pt black catalyst, disperse it with 10 ml of water, add 80 mg of 5% Nafion solution, ultrasonically vibrate evenly, spray it on the surface of the transition layer, and dry it at 90° C. to form a catalytic layer.

[0029] Take a proton exchange membrane with a thickness of 150 microns, cut two small pieces with an area of ​​2cm*2.5cm from the above-mentioned sprayed sheet, clamp them on both sides of the proton exchange membrane oppositely, and clamp them with a thin metal plate Then place it in a hydraulic press at 150°C, and control the pres...

Embodiment 3

[0032] according to figure 1 In the process shown, a tetrafluoromembrane with a thickness of about 50 microns is preferred, wiped clean with alcohol cotton and paved. The size of the tetrafluoromembrane is 5cm*5cm. Weigh 25 mg of carbon powder with a particle size of about 20 nm, add 1 ml of water and 5 ml of ethanol, mix well, spray it on the surface of the PTFE film, and dry it at 100 ° C to form a transition layer. Then weigh 40 mg of PtPd / C catalyst, disperse it with 10 ml of water, add 800 mg of 5% Nafion solution, ultrasonically vibrate evenly, spray it on the surface of the transition layer, and dry it at 100° C. to form a catalytic layer.

[0033] Take a proton exchange membrane with a thickness of 10 microns, cut two small pieces with an area of ​​2cm*2.5cm from the above-mentioned sprayed sheet, clamp them on both sides of the proton exchange membrane oppositely, and clamp them with a thin metal plate Then put it in a hydraulic press at 145°C, and control the pressu...

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Abstract

The invention provides a method for preparing a fuel cell CCM membrane electrode, specifically spraying / screen printing catalyst slurry onto a transfer membrane to form a catalytic layer, and then transferring the catalytic layer onto a proton exchange membrane by hot pressing , to form a CCM electrode, which is a common preparation method for fuel cell membrane electrodes. However, in the process of preparing CCM by transfer printing, there are often problems such as the large adhesion between the catalytic layer and the transfer film, the uneven preparation of the catalytic layer, the uneven temperature and pressure of hot pressing, and the uneven temperature and humidity of the environment. The transfer is not complete, which leads to the failure of CCM preparation. The present invention proposes a transition layer method, which can reduce the adhesion between the catalytic layer and the transfer film, improve the transfer efficiency of the catalytic layer, and improve the water management problem between the catalytic layer and the microporous layer, and The resulting mass transfer problems, etc.

Description

technical field [0001] The invention belongs to the field of fuel cells and relates to a preparation method of a membrane electrode. Background technique [0002] The membrane electrode is the core component of the fuel cell and the place where the electrochemical reaction occurs inside the battery. It is composed of an ion exchange membrane, a catalytic layer, and a gas diffusion layer. Among them, according to the different preparation processes of the catalytic layer, the membrane electrode structure includes the first-generation gas diffusion electrode, the second-generation CCM electrode, and the third-generation thin-layer ordered structure electrode, etc., and the most widely used one is still It is the second generation CCM type membrane electrode. The preparation method of CCM type electrode includes transfer printing method and direct spraying method, and wherein transfer printing method is that slurry is sprayed / printed on other media, then transfers to form cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004
CPCH01M8/1004Y02E60/50
Inventor 宋微俞红梅邵志刚衣宝廉刘晓平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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