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Method for preparing self-humidifying membrane electrode in fuel cell

A fuel cell and self-humidification technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult to achieve stable operation of self-humidified fuel cells and difficult to ensure three channels.

Inactive Publication Date: 2007-03-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above inventions and documents, it is difficult to simultaneously construct the gradient distribution of catalyst, hydrophobic resin, and hydrophilic resin, that is, it is difficult to ensure smooth three channels: electron channel, proton and liquid channel, and gas channel, so it is difficult to realize self-humidifying fuel cells. Stable operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: After the carbon-supported catalyst containing metal platinum and the PTFE resin weight percentage are 0.08ml of emulsion of 10, after secondary water 5ml, pore-enlarging agent 100mg are mixed, ultrasonic dispersion is 20 minutes, be slurry-like, this slurry The object was coated on 7×7cm by scraping method 2 On the hydrophobic carbon paper, the content of metal platinum is: 0.4 mg / cm2, after drying, treat it at 5MPa pressure and 100°C for 3 minutes, and then place it in a muffle furnace for 1 hour in hot air at 350°C; Take the carbon-supported catalyst and mix it with 1ml of Nafion ionic polymer solution with a weight percentage of 5, and then ultrasonically disperse it for 20 minutes. Above, the content of metal platinum is: 0.4 mg / cm2, which is used as the cathode catalyst layer. Using the same method, just change the platinum content to 0.35 mg / cm2 each time, and keep the others unchanged to make the anode catalyst layer. A Nafion112 membrane is sand...

Embodiment 2

[0024] Embodiment 2: After the carbon-supported catalyst containing metal platinum and the PTFE resin weight percentage are 0.05ml of emulsion of 10, after secondary water 5ml, pore-forming agent 50mg are mixed, ultrasonic dispersion 20 minutes, be slurry-like, this slurry The object is sprayed on 7×7cm 2Hydrophobic carbon paper, in which the content of metal platinum is: 0.35 mg / cm2, after drying, treat it at 5MPa pressure and 135°C for 3 minutes, and then place it in a muffle furnace for 1 hour in hot air at 300°C; Get carbon-supported catalyst and 0.5ml weight percentage again after being 5 Nafion ionic polymer solutions and mix, ultrasonic dispersion 20 minutes, be slurry, this slurry is sprayed on the carbon-supported catalyst layer that last process forms, The content of metal platinum is: 0.25 mg / cm2, which is used as the cathode catalyst layer. Using the same method, just change the platinum content to 0.02 mg / cm2 each time, and keep the others unchanged, to make the ...

Embodiment 3

[0026] Embodiment 3: after the carbon-supported catalyst containing metal platinum and ruthenium and PTFE resin weight percentage are 10 ml, after secondary water 10 ml, pore-forming agent 200 mg are mixed, ultrasonic dispersion 20 minutes, be slurry, this The slurry is coated on a 7×7 square centimeter hydrophobic carbon cloth by scraping method, wherein the metal platinum content is: 2 mg / square centimeter, and the ruthenium content: 1 mg / square centimeter. Treat at 135°C for 3 minutes, and then place it in a muffle furnace for 1 hour in hot air at 500°C; take the carbon-supported catalyst and mix it with 2ml of Nafion ionic polymer solution with a weight percentage of 5, and ultrasonically disperse it for 20 minutes. It is in the form of slurry, and the slurry is coated on the carbon-supported catalyst layer formed in the above process by scraping method, wherein the content of metal platinum is: 2 mg / cm2, and the content of ruthenium: 1 mg / cm2, to make a cathode catalytic ...

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Abstract

Carbon paper, carbon cloth, carbon felt, porous thin slice of foam nickel or foam titanium are as electroconductive carrier. Carbon carried catalyst and admixture of hydrophobic latex containing fluoropolymer and hole expansion agent are coated on the electroconductive carrier. Content of catalyst metal contained on carbon carried catalyst on electroconductive carrier is 0.02 - 3 mg / cm2, and content of fluoropolymer on electroconductive carrier is 0.1-2 cm2. Then, following operations are carried out for electroconductive carrier: hot pressing the carrier for 1-5 minutes under l-7MPa, at 100-200 deg.C; after agglomeration at 300-500 deg.C, admixture of carbon carried catalyst and ionic polymer solution is coated on the carrier; faced to a piece of ion exchange membrane, two pieces of dried carrier clip the membrane; membrane electrode is made by hot pressing clipped membrane for 1-5 minutes under l-7MPa, at 100-160 deg.C.

Description

technical field [0001] The invention belongs to a preparation method of a self-humidifying membrane electrode of a fuel cell. Background technique [0002] Regarding the manufacture of membrane electrodes, E. Lamoney et al. describe a general manufacturing method in Chinese patent CN98109696.4: After mixing activated carbon or other conductive carbon with polytetrafluoroethylene emulsion, coat it on carrier carbon paper or carbon Cloth or other conductive carrier, after heat treatment, apply a layer of mixture containing catalyst, polytetrafluoroethylene emulsion, and ion polymer solution, and then sandwich an ion polymer film with two such carriers, and form a polymerized film by hot pressing Membrane electrode, hereinafter referred to as MEA. [0003] Other methods include screen printing, electrodeposition, spraying, sputtering, chemical deposition, and the like. Such patents or documents can be found in: 1. Screen printing method: Int.J.Hydrogen.Energy.vol 23, No.1pp10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 廖建辉邢巍马红超刘长鹏苏怡薛新忠单义斌
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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