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Membrane electrode of protone exchange membrane fuel cell and preparation method thereof

A proton exchange membrane and fuel cell technology, which is applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problem of increasing the contact resistance of membrane electrodes, reducing the time stability of membrane electrodes, affecting the electrochemical performance of fuel cells and Life and other issues, to achieve the effect of ensuring timely discharge

Inactive Publication Date: 2007-07-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the PEMFC membrane electrode has a five-layer structure, the preparation process of the membrane electrode is cumbersome, and the contact resistance between the layers in the membrane electrode is increased. During the use of the fuel cell, the catalytic layer and the diffusion layer are easily separated and detached, reducing the membrane. The time stability of the electrode greatly affects the electrochemical performance and life of the fuel cell
In addition, the diffusion layer of the membrane electrode is made of carbon cloth or carbon paper treated with polytetrafluoroethylene PTFE hydrophobicity. Although it can ensure sufficient strength during use, due to the addition of more non-conductive hydrophobic materials, further The resistivity of the diffusion layer is high, the porosity and structure are unreasonable, and there is no directional drainage and gas transmission channel, which affects the performance of the fuel cell

Method used

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  • Membrane electrode of protone exchange membrane fuel cell and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] (1) At 200°C, dissolve CHF1000 resin into N,N-dimethylformamide to obtain a resin solution with a concentration of 5wt%, and then put 1 part of carbon-supported Pt catalyst into 100 parts of the resin solution , mixed evenly to make a catalyst slurry, wherein the Pt content in the carbon-supported Pt catalyst is 20wt%, the catalyst slurry is sprayed, compounded on both sides of the CHFM1150 membrane, dried at 80 ° C for 60 minutes, and then flattened The catalyst slurry was coated on both sides of the CHFM1150 membrane, and the total loading of the catalyst Pt on the CHFM1150 membrane was 1.0 mg / cm 2 , to obtain a CHFM1150 film coated with catalyst slurry;

[0031] (2) Shorten the activated carbon fiber filaments with a diameter of 50-100 microns so that the length of the activated carbon fibers is between 0.01-5 mm to obtain carbon fibers; respectively place the CHFM1150 film and carbon fiber coated with catalyst slurry in an electrostatic The receiving screen and the...

Embodiment 2

[0034] (1) At 200°C, dissolve the CHF1000 resin into a mixed solvent of water and N,N-dimethylformamide with a volume ratio of 1:5 to obtain a resin solution with a concentration of 5wt%, and then add 5 parts of carbon Load Pt catalyst into 100 parts of resin solution, mix uniformly to make catalyst slurry, wherein the Pt content in the carbon-supported Pt catalyst is 20wt%, the catalyst slurry is compounded on both sides of the CHFM1150 membrane by spraying, Dry at 80°C for 60 minutes, and then coat the catalyst slurry on both sides of the CHFM1150 membrane after leveling. The total loading of catalyst Pt on the CHFM1150 membrane is 1.0mg / cm 2 , to obtain a CHFM1150 film coated with catalyst slurry;

[0035] (2) Shorten graphite carbon fiber filaments with a diameter between 50 and 100 microns, so that the length of graphite carbon fibers is between 0.01 and 5 mm to obtain carbon fibers; respectively place the CHFM1150 film and carbon fiber coated with catalyst slurry in an e...

Embodiment 3

[0038] (1) At 200°C, CHF1000 resin is dissolved in N, N-dimethylacetamide to obtain a resin solution with a concentration of 5 wt%, and then 200 parts of carbon-supported Pt catalysts are dropped into 100 parts of the resin solution , mixed evenly to make a catalyst slurry, wherein the Pt content in the carbon-supported Pt catalyst is 40wt%, the catalyst slurry is sprayed, compounded on both sides of the CHFM10125 film, dried at 80 ° C for 60 minutes, and then flattened The catalyst slurry was coated on both sides of the CHFM10125 membrane, and the total loading of the catalyst Pt on the CHFM10125 membrane was 1.0 mg / cm 2 , to obtain the CHFM10125 proton exchange membrane coated with catalyst slurry;

[0039] (2) Shorten the activated carbon fiber filaments with a diameter of 50-100 microns so that the length of the activated carbon fibers is between 0.01-5 mm to obtain carbon fibers; respectively place the CHFM10125 film and carbon fiber coated with catalyst slurry in an elec...

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Abstract

This invention discloses a membrane electrode for PEMFC and its preparation method, which is made of three tiers. The middle layer is proton exchange membrane, and the two-side layers are porous cathode and porous anode catalyst-diffusion layer respectively which are both made of the catalyst, slurry and carbon fiber on the outer surface. The membrane electrode of this invention is obtained by using static flocking technology to implant the carbon fiber directly onto PEM with catalyst slurry and then drying. It simplifies the process of membrane electrode, reduces the contact resistance between layers, raises the capability of gas quick spreading and water timely discharge, and improves the electrochemical properties. When the current density is 200mA / cm2, the discharge power of battery increases 14~20%.

Description

Technical field: [0001] The invention relates to a battery electrode and a preparation method thereof, in particular to a membrane electrode for a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is a power generation device that converts hydrogen energy into electrical energy. The PEMFC system consists of the following parts. The electrolyte is a proton exchange membrane (PEM), the catalytic layer (the catalyst is carbon-supported Pt or carbon-supported Pt-Ru alloy), and the bipolar plate (graphite or surface modification with gas and water flow channels). permanent metal plate). Because the chemical energy is directly converted into electrical energy, it is not limited by the Carnot thermal cycle, so the energy conversion efficiency is high, about 60%, which is 2 to 3 times that of the internal combustion engine; and the working current is large and the specific power is high. In...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M2/16H01M4/92H01M4/96H01M4/88C08J5/22H01M8/1004
CPCY02E60/50
Inventor 张永明李磊
Owner SHANGHAI JIAO TONG UNIV
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