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Enhanced gas diffusion layer microporous membrane for fuel cell membrane electrode, membrane electrode and preparation method thereof

A fuel cell membrane and gas diffusion layer technology, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems affecting the durability of membrane electrodes and the complexity of the catalyst coating process, so that the coating process is simple and easy to ensure that the electrical Chemical performance, easy industrialization effect

Inactive Publication Date: 2019-06-28
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve the specific power of the fuel cell, the electrolyte membrane has been reduced from about 100 μm to 10-20 μm, which brings about two problems of mechanical strength and the complexity of the membrane electrode processing during use. The proton exchange membrane itself has swelling properties, which makes the catalyst The coating process is complex and affects the durability of the membrane electrode

Method used

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  • Enhanced gas diffusion layer microporous membrane for fuel cell membrane electrode, membrane electrode and preparation method thereof
  • Enhanced gas diffusion layer microporous membrane for fuel cell membrane electrode, membrane electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add polytetrafluoroethylene emulsion and conductive carbon black into ethanol and ultrasonically disperse for 30 minutes, then heat and coagulate in an 80-degree water bath for 20 minutes to obtain a viscous slurry. In the slurry raw materials, 50 parts by weight of carbon powder, mass Concentration is 30 parts by weight of polytetrafluoroethylene emulsion of 60%, 20 parts by weight of absolute ethanol;

[0029] The viscous slurry obtained in step (1) is mixed with a plasticizer, 96 parts by weight of the slurry, 4 parts by weight of the plasticizer, the plasticizer is toluene, mechanically stirred for 10 minutes, and a film is prepared by rolling technology;

[0030] After drying at room temperature, bake at 240 degrees for 30 minutes, and bake at 340 degrees for 30 minutes to obtain a fuel cell-enhanced gas diffusion layer microporous membrane;

[0031] Use screen printing technology to prepare a Pt / C catalytic layer on one side of the microporous membrane, and prepar...

Embodiment 2

[0035] Add polytetrafluoroethylene emulsion and graphene to ethanol and ultrasonically disperse for 30 minutes, then heat and coagulate in an 80-degree water bath for 16 minutes to obtain a viscous slurry. In the slurry raw materials, 56 parts by weight of graphene, mass concentration 28 parts by weight of 60% polytetrafluoroethylene emulsion, 16 parts by weight of absolute ethanol;

[0036] Mix the viscous slurry obtained in step (1) with a plasticizer, 95 parts by weight of the slurry, 5 parts by weight of the plasticizer, the plasticizer is phenol, mechanically stirred for 10 minutes, and the film is prepared by wet stretching technology ;

[0037] After drying at room temperature, bake at 250 degrees for 25 minutes, and bake at 350 degrees for 25 minutes to obtain a fuel cell-enhanced gas diffusion layer microporous membrane;

[0038] Electrostatic spraying technology is used to prepare a Pt / C catalytic layer on one side of the microporous membrane to prepare a microporou...

Embodiment 3

[0042] Add polytetrafluoroethylene emulsion and carbon nanotubes to ethanol and ultrasonically disperse them for 20 minutes, then heat and coagulate in an 80-degree water bath for 10 minutes to obtain a viscous slurry. Among the slurry raw materials, 62 parts by weight of carbon nanotubes, 25 parts by weight of polytetrafluoroethylene emulsion with a mass concentration of 60%, and 13 parts by weight of absolute ethanol;

[0043] The viscous slurry obtained in step (1) is mixed with a plasticizer, 98 parts by weight of the slurry, 2 parts by weight of a plasticizer, and the plasticizer is cyclohexanone, mechanically stirred for 20 minutes, and wet stretching technology is adopted Prepare thin film;

[0044] After drying at room temperature, bake at 250 degrees for 25 minutes, and bake at 350 degrees for 25 minutes to obtain a fuel cell-enhanced gas diffusion layer microporous membrane;

[0045] Electrostatic spraying technology is used to prepare a catalytic layer Pt / C on one ...

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Abstract

The invention discloses an enhanced gas diffusion layer microporous membrane for a fuel cell membrane electrode, the membrane electrode and a preparation method thereof, and belongs to the field of fuel cells. A fuel cell enhanced gas diffusion layer is a self-supporting microporous membrane, the microporous membrane is prepared by performing rolling, stretching for film formation and roasting ona mixture of polytetrafluoroethylene and carbon powder, the thickness of the self-supporting microporous membrane is 30 to 50 micrometers, the surface of the microporous membrane is coated to preparea catalytic layer to obtain microporous membrane supporting catalytic layers. An enhanced membrane electrode is composed of an anode gas diffusion layer, an anode microporous membrane supporting catalytic layer, a proton exchange membrane, a cathode microporous membrane supporting catalytic layer and a cathode gas diffusion layer. The enhanced membrane electrode is obtained by combination. The enhanced gas diffusion layer prepared by the invention has excellent conductivity and strength and high gas permeability and water conductivity, the micropore distribution is uniform, the membrane electrode is assembled by the microporous membrane supporting catalytic layers and the strength of the membrane electrode is significantly improved, the processing process is simple, the performance of themembrane electrode is good, and the industrial mass production is facilitated.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to the preparation technology of an enhanced gas diffusion layer and the assembly method of an enhanced membrane electrode. Background technique [0002] The membrane electrode is the core component of the fuel cell, which is composed of a gas diffusion layer, a catalytic layer and a proton exchange membrane, and is assembled by a hot pressing process. In order to improve the specific power of the fuel cell, the electrolyte membrane has been reduced from about 100 μm to 10-20 μm, which brings about two problems of mechanical strength and the complexity of the membrane electrode processing during use. The proton exchange membrane itself has swelling properties, which makes the catalyst The coating process is complex and affects the durability of the membrane electrode. The gas diffusion layer is usually composed of a base layer and a microporous layer. The base layer usually play...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 朱少敏徐洪峰邓晗王建海徐冰卢璐
Owner DALIAN JIAOTONG UNIVERSITY
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