Preparing method for corrosion-resistant gas diffusion layer of fuel cell

A gas diffusion layer and fuel cell technology, applied in fuel cells, solid electrolyte fuel cells, electrical components, etc., to overcome agglomeration, improve corrosion resistance and stability, and improve dispersion effects

Inactive Publication Date: 2015-12-02
HUANGHE S & T COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A microporous layer with good durability will undoubtedly play a crucial role in the long-term sta

Method used

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  • Preparing method for corrosion-resistant gas diffusion layer of fuel cell
  • Preparing method for corrosion-resistant gas diffusion layer of fuel cell
  • Preparing method for corrosion-resistant gas diffusion layer of fuel cell

Examples

Experimental program
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Example Embodiment

[0028] Example 1

[0029] Dissolve polyvinylpyrrolidone (PVP) in deionized water, and the mass ratio of PVP to deionized water is 1:1999 (that is, the mass percentage of PVP in the solution is 0.5‰); measure 15 ml of the solution, and add two Tin oxide (SnO 2 ) nanopowder and indium oxide (In 2 o 3 ) A total of 75 mg of nano powder (ie SnO 2 and In 2 o 3 The mass percentage of nano powders in the total solution is 0.5%), fully mechanically stirred for 0.5 hours, and then ultrasonically dispersed for 30 minutes to form a uniform suspension; then add polytetrafluoroethylene (PTFE) with a mass fraction of 10% to it A total of 30 mg of emulsion (i.e. the mass of PTFE as SnO 2 and In 2 o 3 4% of the total mass of the nanometer powder), stirred slowly for 10 minutes to form a microporous layer slurry; prepare a carbon fiber paper with a porosity of 30% and a thickness of 190 microns as the support layer, and use the prepared microporous layer slurry The glass rod is rolle...

Example Embodiment

[0031] Example 2

[0032] Dissolve alkylphenol polyoxyethylene ether (APEO) in deionized water, and the mass ratio of APEO to deionized water is 1:666 (that is, the mass percentage of APEO in the solution is 1.5‰); measure 15 ml of the solution, Add a total of 464 mg of fluorine-doped tin dioxide (FTO) nanopowder to it (that is, the mass percentage of FTO nanopowder in the total solution is 3%), fully mechanically stir for 1 hour, and then ultrasonically disperse for 40 minutes to form a uniform suspension liquid; adding thereto a total of 462 mg of tetrafluoroethylene and hexafluoropropylene copolymer (FEP) emulsion with a mass fraction of 10% (that is, the quality of FEP is 10% of the FTO nano-powder quality), and stirred slowly for 15 minutes, Form the microporous layer slurry; prepare a carbon fiber paper with a porosity of 45% and a thickness of 200 microns as a support layer, and roll the prepared microporous layer slurry onto one side of the carbon fiber paper support...

Example Embodiment

[0034] Example 3

[0035] Dissolve polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (PEO-PPO-PEO) in deionized water, and the mass ratio of PEO-PPO-PEO to deionized water is 1:332 (that is, PEO-PPO -PEO accounted for the mass percent of the solution is 3 ‰); measure 15 milliliters of the solution, to which 789 mg of aluminum-doped zinc dioxide (AZO) nanopowder was added (that is, the mass percent of AZO nanopowder accounted for the total solution was 5 %), fully mechanically stirred for 1 hour, and then ultrasonically dispersed for 50 minutes to form a uniform suspension; then add 1.58 grams of polyvinylidene fluoride (PVDF) emulsion with a mass fraction of 10% (that is, the mass of PVDF is AZO nano 20% of the mass of the powder), stirred slowly for 20 minutes until uniform to form a microporous layer slurry; prepare a carbon fiber paper with a porosity of 60% and a thickness of 150 microns as the support layer, and use the prepared microporous layer slurry Th...

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Abstract

The invention discloses a preparing method for a corrosion-resistant gas diffusion layer of a fuel cell. The gas diffusion layer is composed of a micropore layer and a supporting layer. The preparing method includes the following steps: metallic oxide nano-powder is added into a dispersing-agent-containing aqueous solution, and stirring and ultrasonic dispersion are carried out till even suspension liquid is formed; then water repellent emulsion is added, and stirring is carried out till micropore layer slurry is formed; one side of the supporting layer is evenly coated with the micropore layer slurry, and low-concentration water repellent emulsion is sprayed to the other side of the supporting layer; the object is dried and placed into a nitrogen-charged dryer to be sintered, and the gas diffusion layer is obtained. By means of the gas diffusion layer obtained with the preparing method, it is effectively guaranteed that conductive materials and hydrophobic materials in the micropore layer slurry are evenly dispersed, the gas diffusion layer has the proper hydrophilic performance and the proper hydrophobic performance accordingly, the corrosion resistance and the stability of the gas diffusion layer are improved, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a preparation method of a corrosion-resistant fuel cell gas diffusion layer. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) core component membrane electrode assembly (MEA) is composed of gas diffusion layer, catalytic layer and proton exchange membrane. The gas diffusion layer (GDL) is located between the catalytic layer and the flow field, and its main function is to support the catalytic layer, collect current, and provide channels for the transport of reaction gases and product water. [0003] A typical gas diffusion layer is usually composed of a support layer and a microporous layer. The support layer is composed of porous conductive media such as carbon fiber paper or carbon cloth, and the microporous layer is generally composed of carbon powder and hydrophobic polytetrafluoroethylene (PTFE). )constitute. The drainage per...

Claims

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Application Information

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IPC IPC(8): H01M8/10H01M4/88
CPCH01M4/8807H01M8/1004Y02E60/50
Inventor 于书淳杨汉嵩秦国帅刘权孙莹
Owner HUANGHE S & T COLLEGE
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