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Method for preparing complex film of proton exchange film for fuel cell

A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell parts, solid electrolyte fuel cells, etc., can solve the problems of composite membranes, difficulty in making compactness, etc., and achieve flexibility, mechanical strength, The effect of easy control of immersion amount and low cost

Inactive Publication Date: 2003-05-07
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to produce a composite film with good density.

Method used

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  • Method for preparing complex film of proton exchange film for fuel cell
  • Method for preparing complex film of proton exchange film for fuel cell
  • Method for preparing complex film of proton exchange film for fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Cut a piece of 10×11cm 2 Polytetrafluoroethylene (PTFE) porous membrane with a thickness of 30 μm (SEM scanning electron micrographs are shown in the attached figure 1 ), soak in ethanol solution to remove organic matter on the surface. Then spread the PTFE porous membrane on a flat glass, Nafion (R) The solution was mixed with DMSO at a ratio of 1:8 (volume), and 17.6 g of the solution was dropped onto the surface of the porous membrane. Put it on a 50°C hot stage, and after 1 hour, the temperature is raised to 75°C, and after 1 hour, the temperature is raised to 120°C. Take it off the hot table, put it in a vacuum oven at 100°C for 12 hours, cool it down to room temperature and take it out to get Nafion (R) / PTFE composite membrane (film thickness 45μm). Put it into double distilled water, take out the membrane, and save it in deionized water for later use.

[0034] Porous gas diffusion electrodes were prepared using carbon paper, polytetrafluoroethyl...

Embodiment 2

[0037] Embodiment 2: Prepare perfluorosulfonic acid Nafion by using the method of Example 1 (R) / PTFE composite membrane and membrane electrode three-in-one, PTFE porous membrane adopts 15μm thick film (10×11cm 2 ), its SEM photo is shown in the attached image 3 . in Nafion (R) DMF was added to the solution at a ratio of 1:8 (volume ratio). 28 g of the mixed solution was added dropwise on the surface of the porous membrane. The prepared composite film was placed in a vacuum oven at 150°C overnight. Preparation of Nafion (R) The thickness of the / PTFE composite membrane is 70 μm, and the membrane electrode three-in-one is prepared by hot pressing this membrane. The assembled PEMFC was tested for battery performance on a single-cell evaluation device. The polarization curve of the test battery is attached Figure 4 . The operating conditions of the battery are the same as in Example 1.

Embodiment 3

[0038] Embodiment 3: Use the mixed solvent of low molecular weight alcohols and water to dissolve perfluorosulfonic acid Nafion in a closed reactor (R) Membrane corner material, made of Nafion (R) solution. With this solution, adopt example 1 method to prepare perfluorosulfonic acid composite membrane and membrane electrode three-in-one, PTFE porous membrane adopts 15 μ m thick film (10 * 11cm 2 ), its SEM photo is shown in the attached image 3 . in Nafion (R) DMAC was added to the solution at a ratio of 1:8 (volume ratio). 14.6 g of the mixed solution was added dropwise on the surface of the porous membrane. The prepared composite film was placed in a vacuum oven at 200°C overnight. Preparation of Nafion (R) The thickness of the / PTFE composite membrane is 25 μm, and the membrane electrode three-in-one is prepared by hot pressing this membrane. The assembled PEMFC was tested for battery performance on a single-cell evaluation device. The polarization curve of the te...

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Abstract

The method includes following steps. The porous membrane of high polymer is dipped in ethanol solution in order to remove the organic matter on the surface. The organic solvent with high boiling point is added to the porous membrane, which is then put to the vacuum oven heating to obtain the composite proton exchange membrane of perfluorosulfuric acid. The thickness of the membrane is 10-100 micron m. The invention possessesthe advantages of easy to control the thickness of the composite membrane and the immersion quantity of the perfluoro resin, providing the membrane with the proporties of airtight and good intensity. It is safe to be used in the fuel cell.

Description

technical field [0001] The invention relates to a method for preparing a proton exchange membrane composite membrane for a fuel cell, in particular to a method using perfluorosulfonic acid resin and high temperature. 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. It will be widely used in aerospace, military, energy and transportation and other fields. The electrode of PEMFC is a porous gas diffusion electrode, and pure Pt, Pt / C or Pt-Ru / C are used as electrocatalysts, and the electrolyte is a solid polymer proton exchange membrane. Proton exchange membrane (PEM) is one of the core components of PEMFC. It is very different from the diaphragm used in general chemical power sources. First of all, it is not only a diaphragm material, but also an electrolyte (proton transfer) and electrode active material ( Electrocatal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M4/88H01M8/1041
CPCY02E60/521Y02E60/50
Inventor 刘富强衣宝廉邢丹敏于景荣张华民
Owner SUNRISE POWER CO LTD
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