Method for preparing membrane electrode for hydrophilicity and hydrophobicity-adjustable proton exchange membrane fuel battery on the basis of catalyst/membrane technology

A proton exchange membrane technology with adjustable hydrophilicity and hydrophobicity, which can be used in battery electrodes, circuits, electrical components, etc.

Active Publication Date: 2010-08-11
武汉理工新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] It can be seen from the above patents that the catalytic layer of the catalyst / membrane module uses a proton-conducting polymer as a binder, so there is a problem of water flooding
On the other hand, the proton exchange membrane near the electrochemical reaction area has aging problems during long-term use, and the proton-conducting polymer in the catalytic layer as the electrochemical reaction area is more prone to aging, which will make the stability of the catalytic layer decreased sex

Method used

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  • Method for preparing membrane electrode for hydrophilicity and hydrophobicity-adjustable proton exchange membrane fuel battery on the basis of catalyst/membrane technology
  • Method for preparing membrane electrode for hydrophilicity and hydrophobicity-adjustable proton exchange membrane fuel battery on the basis of catalyst/membrane technology

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Embodiment 1

[0036] A method for preparing a membrane electrode for a proton exchange membrane fuel cell with adjustable hydrophilicity and hydrophobicity, the preparation steps are as follows:

[0037] 1. Get 3g of Pt / C catalyst (carbon-supported Pt catalyst, the mass content of Pt is 40%), add 15g of water and mix with the catalyst evenly to make the catalyst wet; get another 1g of PTFE emulsion with a mass concentration of 60%, add 12g of water Mix well, then add 20g of 5% Solution (produced by DuPont Company, 5% is Nafion resin, 95% is water and low-boiling point alcohol components), these mixed solutions are poured into the wetted catalyst and mixed evenly to prepare slurry;

[0038] 2. Pretreatment of proton exchange membrane: take The membrane is a proton exchange membrane with a thickness of 51 μm; immersed in 5% H 2 o 2 heat treatment at 70°C for 1 hour, rinsed with deionized water three times, and then immersed in 0.5mol / L H 2 SO 4 Heat treatment in the solution at 70°C fo...

Embodiment 2

[0046] A method for preparing a membrane electrode for a proton exchange membrane fuel cell with adjustable hydrophilicity and hydrophobicity, the preparation steps are as follows:

[0047] 1. Take 1.2g of Pt black catalyst, add 3.6g of water to wet the catalyst; take another 2g of PTFE emulsion with a mass concentration of 60%, add 5g of water to disperse evenly, then add 40g of 3% sulfonated trifluorostyrene solution and mix Uniformly, finally pour these mixed solutions into the wetted catalyst and disperse evenly to obtain a slurry;

[0048] 2, The pretreatment method of membrane, PTFE membrane is identical with embodiment 1, adopts screen printing equipment to be coated with slip on PTFE membrane, with N 2 For protective gas, dry at 100-120°C, heat to remove the solvent, and form a catalytic layer on the PTFE membrane; the screen size is 40-200 mesh nylon mesh, and the single-pass printing area is 15×30cm. Put the PTFE membrane medium coated with the catalyst layer into...

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Abstract

The invention relates to a method for preparing a membrane electrode for a hydrophilicity and hydrophobicity-adjustable proton exchange membrane fuel battery on the basis of a catalyst / membrane technology, comprising the following steps of: mixing deionized water and a hydrophobizing agent and then adding an alcohol-containing proton conduction polymer solution in the mixture and uniformly mixing to prepare a hydrophobizing agent and proton conduction polymer solution dispersion; wetting a catalyst by using the deionized water; adding the hydrophobizing agent and proton conduction polymer solution dispersion in the wet catalyst for dispersion to prepare catalyst slurry; coating the catalyst slurry on two mediums and drying by heating to obtain two mediums with catalytic layers through thermal processing; placing a proton exchange membrane between the catalytic layers of the two mediums with the catalytic layers and respectively shifting the catalytic layers on the two mediums to the two surfaces of the proton exchange membrane through thermal compression to obtain a catalyst-covering proton exchange membrane assembly; and placing the assembly between two gas diffusion layers and then making the assembly into the membrane electrode through the thermal compression, wherein the two surfaces of the proton exchange membrane exactly face the two gas diffusion layers.

Description

technical field [0001] The invention relates to a method for preparing a membrane electrode for a proton exchange membrane fuel cell, in particular to a method for preparing a membrane electrode for a proton exchange membrane fuel cell with adjustable hydrophilicity and hydrophobicity based on catalyst covering membrane (abbreviated as: catalyst / membrane) technology. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high power density, high energy conversion efficiency, low-temperature start-up, and environmental friendliness. Today's deterioration has become one of the hot spots of international high-tech competition. The core component for proton exchange membrane fuel cells - catalyst / membrane module (catalyst coated membrane, CCM) is a proton membrane developed in recent years that is different from the traditional membrane electrode assembly (MEA) structure. Exchange membrane fuel cell core components. The traditional membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 潘牧田明星艾勇诚宛朝辉李虎胡阿勇陈磊
Owner 武汉理工新能源有限公司
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