Forming method of ePTFE enhanced proton exchange membrane

A technology of proton exchange membrane and forming method, which is applied in the field of membrane material preparation, can solve the problems of uneven thickness of composite membrane and low film forming efficiency, and achieve the effects of dense film structure, low overcoming efficiency and rapid film formation

Inactive Publication Date: 2020-06-09
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

The spraying method needs to repeatedly spray the cation exchange resin solution on both sides of the ePTFE material, and the film forming efficiency is low; the impregnation method is affected by gravity and the perfluorosulfonic acid solution accumulates at the low point of the film, and the prepared composite film usually has the problem of uneven thickness , and repeated impregnation is required to obtain the desired thickness

Method used

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  • Forming method of ePTFE enhanced proton exchange membrane
  • Forming method of ePTFE enhanced proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare a perfluorosulfonic acid solution with a mass solid content of 5.0% of the cation exchange resin solution, wherein the solvent is ethanol, and the solute is domestic perfluorosulfonic acid resin (PFSA). Copper plates were used as the working electrode and the counter electrode respectively, and the working electrode was wrapped with the ePTFE membrane impregnated with the above solution.

[0031] Put the working electrode and the counter electrode vertically into the solution, and place them parallel to each other (the side of the working electrode wrapped with ePTFE membrane is placed parallel to the counter electrode), the vertical distance between the two is 0.5cm, and the wetting area of ​​the working electrode in the solution is 100cm 2 . The constant voltage mode was adopted, the voltage was set to 1.0V, and the electrodeposition time was set to 400s.

[0032] Working current density from -0.53mA / cm 2 down to -0.18mA / cm 2 , Take out the working electrod...

Embodiment 2

[0034] The mass solid content of configuration cation exchange resin solution is 5.0% perfluorosulfonic acid solution, wherein solvent is the mixed solution of ethanol and DMSO (the volume ratio of ethanol and DMSO is 6:4), and solute is domestic PFSA. Stainless steel plates were used as the working electrode and the counter electrode respectively, and the working electrode was wrapped with the ePTFE membrane impregnated with the above solution.

[0035] Put the working electrode and the counter electrode vertically into the solution, and place them parallel to each other (the side of the working electrode wrapped with ePTFE membrane is placed parallel to the counter electrode), the vertical distance between the two is 0.5cm, and the wetting area of ​​the working electrode in the solution is 100cm 2 . The constant voltage mode was adopted, the voltage was set to 1.0V, and the electrodeposition time was set to 400s.

[0036] Working current density from -0.63mA / cm 2 down to -...

Embodiment 3

[0038] The mass solid content of configuration cation exchange resin solution is 5.0% perfluorosulfonic acid solution, wherein solvent is the mixed solution of ethanol and DMSO (the volume ratio of ethanol and DMSO is 6:4), and solute is domestic PFSA. Copper plates were used as the working electrode and the counter electrode respectively, and the working electrode was wrapped with the ePTFE membrane impregnated with the above solution.

[0039] Put the working electrode and the counter electrode vertically into the solution, and place them parallel to each other (the side of the working electrode wrapped with the ePTFE membrane is placed parallel to the counter electrode). The wetting area of ​​the working electrode in the solution is 100cm 2 , and the distance to the electrode is 0.5cm. Using constant current mode, the current density is set to -0.25mA / cm 2 , The electrodeposition time is set to 400s.

[0040] The working voltage is increased from 0.27V to 0.90V, take out...

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Abstract

The invention discloses a forming method of an ePTFE enhanced proton exchange membrane, which relates to the field of membrane material preparation. An ePTFE enhanced membrane is prepared by adoptingan electro-deposition method, and the ePTFE enhanced membranes with different thicknesses are prepared by controlling current or voltage and matching with solution components, the infiltration area ofan electrode in a solution, the electrode distance and the deposition time modulation. The defects of a traditional ePTFE enhanced membrane preparation process are overcome, and efficient and rapid membrane forming can be achieved.

Description

technical field [0001] The invention relates to a preparation method of a proton exchange membrane for a fuel cell, in particular to a proton exchange membrane with a porous network material as a supporting structure, and relates to the field of membrane material preparation. Background technique [0002] A fuel cell is an electrochemical conversion device that converts chemical energy into electrical energy, and is one of the most competitive power generation technologies in the 21st century. Proton exchange membrane fuel cells are characterized by relatively low temperature and normal pressure, plus no chemical hazards to the human body and no harm to the environment. They are suitable for daily life, so they are developed and applied in transportation power, on-site and portable units. [0003] The application of ultra-thin proton exchange membranes reduces the ohmic polarization to a certain extent and promotes the development of fuel cells. However, problems such as poo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1069H01M8/1018H01M8/1086
CPCH01M8/1018H01M8/1069H01M8/1086H01M2008/1095Y02E60/50
Inventor 王素力马文佳孙公权李焕巧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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