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Gas diffusion electrode, membrane-electrolyte assembly, polymer electrolyte fuel cell, and methods for producing these

A gas diffusion electrode and electrode assembly technology, applied in solid electrolyte fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of insufficient hydrophobicity, damage, and battery performance degradation, and achieve excellent discharge performance Effect

Inactive Publication Date: 2008-05-07
TOMOEGAWA PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the gas diffusion electrode formed by coating the above-mentioned mixture fills the gaps of the stainless steel mesh fabric, so there is a problem that the gas permeability inside the gaps is deteriorated, and the performance of the battery is lowered.
In addition, there is also the following problem: in the process of applying pressure to the gas diffusion electrode in order to make the gas diffusion electrode adhere to the electrolyte or use an adhesive to bond it, the porous membrane of the gas diffusion electrode will be damaged. The gaps are destroyed, hindering the discharge of gas and water
[0011] However, the diffusion layer formed by this method has problems such as low strength and insufficient hydrophobicity.

Method used

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  • Gas diffusion electrode, membrane-electrolyte assembly, polymer electrolyte fuel cell, and methods for producing these
  • Gas diffusion electrode, membrane-electrolyte assembly, polymer electrolyte fuel cell, and methods for producing these
  • Gas diffusion electrode, membrane-electrolyte assembly, polymer electrolyte fuel cell, and methods for producing these

Examples

Experimental program
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Effect test

Embodiment approach

[0101] Embodiment (the 1)

[0102] Next, Embodiment (No. 1) will be specifically described. The gas diffusion electrode of the embodiment (1) has at least a porous fluororesin film containing a fibrous carbon material, and preferably has a smooth surface having the hydrophobicity and drainage properties of the fluororesin and the conductivity of the carbon material.

[0103] In the embodiment (1), examples of the above-mentioned fluororesin include vinylidene fluoride, tetrafluoroethylene, tetrafluoroethylene-fluoroalkyl vinyl ether copolymer, vinyl fluoride-hexafluoropropylene copolymer, etc., which can be selectively used A fluororesin formed from one or more of the above resins. Among them, fluoroolefin-based resins are particularly preferable because they have high heat resistance and good mechanical strength. Fluoroolefin-based resins can form high-precision porous membranes, and have advantages such as good discharge of humidification water inside the porous membrane a...

Embodiment 1～10、 comparative example 1 and 2

[0194] (Fabrication of Gas Diffusion Electrodes)

[0195] 30 parts by weight of vinylidene fluoride resin was dissolved in 600 parts by weight of 1-methyl-2-pyrrolidone, and acetylene carbon black and carbon fiber (manufactured by Showa Denko Co., Ltd. , trade name: VGCF (aspect ratio of 10 to 500)) was dispersed to obtain a dispersion. Then, 45 parts by weight of diethylene glycol was mixed and stirred to obtain a dope. The obtained paint was coated on a polyethylene naphthalate (PEN) film using a coater to obtain a coated film, which was dried to obtain a gas diffusion electrode composed of a porous fluororesin film.

[0196] (Measurement of physical properties and confirmation test of void destruction)

[0197] The mass per unit area and film thickness of the obtained gas diffusion electrode were measured. The density was calculated from the measured mass, and the above-mentioned porosity was calculated. Then, in order to confirm the degree of void destruction by hot pr...

Embodiment 1-A～ Embodiment 10-A、 comparative example 1-A and comparative example 2-A

[0207] (Preparation example A of solid polymer fuel cell)

[0208] Two 50 mm square gas diffusion electrodes (with substrates) obtained in Examples 1 to 10 and Comparative Examples 1 to 2 were used. On the surfaces of the porous membranes of the two gas diffusion electrodes, catalyst paints consisting of carbon carrying a platinum catalyst, an ion-conducting resin, and a mixed solution of water and ethanol were coated and dried to form a catalyst layer. Catalyst layer gas diffusion electrode. The amount of each platinum catalyst is 0.3 mg / cm 2 . Then, a gas diffusion electrode with a catalyst layer was arranged to connect the catalyst layer to a polymer electrolyte membrane (manufactured by DuPont, trade name: Nafion 117), and the gas diffusion electrode with the catalyst layer was bonded by hot pressing (120° C., 10 MPa, 10 minutes). The diffusion electrode and the polymer electrolyte membrane were peeled off to remove the substrate PEN film used in the production of the g...

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Abstract

PROBLEM TO BE SOLVED: To provide a gas diffusion electrode for solid polymer fuel cell that is superior in water-repellent property for quickly supplying and removing reaction gas, and in conductivity that effectively transmits generated electricity.SOLUTION: The gas diffusion electrode for solid polymer fuel cell is formed only by fibrous carbon material or has a porous fluororesin, formed by painting a liquid prepared by dispersing carbon material constituted of a fibrous carbon material and a particle-shaped carbon material in fluororesin solution. The film-electrode assembly for the solid polymer fuel cell can be manufactured, by laminating the gas diffusion electrodes 3a, 3b on both surfaces of the solid polymer electrolyte film 1 via catalyst layers 2a, 2b.

Description

technical field [0001] The present invention relates to a gas diffusion electrode, a membrane-electrode assembly, a solid polymer fuel cell and a manufacturing method thereof. Background technique [0002] A fuel cell is a power generation system that continuously supplies fuel and oxidant, and uses the chemical energy of the electrochemical reaction of the substances as electrical output. Fuel cells that use this electrochemical reaction to generate electricity use the reverse reaction of water electrolysis, that is, the mechanism in which hydrogen and oxygen combine to form electrons and water. They have high efficiency and excellent environmental characteristics, so they have attracted attention in recent years. [0003] Fuel cells can be classified into phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells, alkali fuel cells and solid polymer fuel cells according to the type of electrolyte. In recent years, particular attention has been paid to...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02H01M4/88H01M2/16C08J5/22H01M8/10
CPCY02E60/12Y02E60/521Y02P70/50Y02E60/50
Inventor 铃木利保田中弘真
Owner TOMOEGAWA PAPER CO LTD
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