Membrane electrode assembly of fuel cell and production method of membrane electrode assembly

A membrane electrode assembly and fuel cell technology, applied in fuel cells, electrical components, circuits, etc., can solve problems affecting fuel cell performance, numerous parameters, unfavorable mass production, etc.

Inactive Publication Date: 2018-03-23
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned schemes are either complicated in preparation process and have many parameters to be controlled, which is not conducive to mass production, or the effect of improving the water management of the fuel cell is not good, which in turn affects the performance of the fuel cell

Method used

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  • Membrane electrode assembly of fuel cell and production method of membrane electrode assembly
  • Membrane electrode assembly of fuel cell and production method of membrane electrode assembly
  • Membrane electrode assembly of fuel cell and production method of membrane electrode assembly

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preparation example Construction

[0033]The present invention also provides a method for preparing a membrane electrode assembly of a fuel cell, comprising the following steps:

[0034] A), preparing microporous layer slurry mixture and catalytic layer slurry mixture;

[0035] B), coating the microporous layer slurry mixture on the surface of the hydrophobically treated gas diffusion layer, and obtaining a microporous layer after heat treatment; coating the catalytic layer slurry mixture on the surface of the electrolyte membrane, and obtaining a membrane / electrode combination after heat treatment body; by separately controlling the coating process of the microporous layer and the membrane / electrode combination, the thickness of the microporous layer decreases in the direction of the air flow path, and the thickness of the catalytic layer in the membrane / electrode combination is in the direction of the air flow path Incrementally, the microporous layer is consistent with the total thickness of the catalytic la...

Embodiment 1

[0046] The microporous layer dispersion composed of carbon powder, polytetrafluoroethylene emulsion, deionized water and surfactant is used for ultrasonic dispersion and mechanical stirring to form a uniform microporous layer slurry; this slurry is coated on the gas diffusion On one side of the layer, the coating tool is a coating machine using a scraper, and the thickness gradient along the air inlet to the air outlet is formed by changing the height of both ends of the scraper; here, the scraper on the air inlet side is higher than the air outlet side, and the inlet side The thickness of the coated slurry is greater than that of the outlet side, and after heat treatment, a microporous layer is formed. The microporous layer has a thickness gradient distribution along the air inlet to the outlet, the thickness of the inlet is 40 μm, and the thickness of the outlet is 30 μm;

[0047] Carbon-supported platinum catalyst, solvent and ionomer liquid are used to form the catalytic la...

Embodiment 2

[0049] The microporous layer dispersion composed of carbon powder, polytetrafluoroethylene emulsion, deionized water and surfactant is used for ultrasonic dispersion and mechanical stirring to form a uniform microporous layer slurry; this slurry is coated on the gas diffusion On one side of the layer, the coating tool is a coating machine using a scraper; here, the scraper on the air inlet side is at the same height as the air outlet side, and after heat treatment, a highly water-permeable microporous layer with uniform thickness is formed, with a thickness of 35 μm; The carbon-supported platinum catalyst, solvent and ionomer liquid constitute the catalytic layer electrode dispersion liquid, which is ultrasonically dispersed and mechanically stirred to form a uniform slurry; the slurry is coated on the surface of the electrolyte membrane, and the coating tool is a spatula The coating machine, where the scraper on the air inlet side is at the same height as the air outlet side, ...

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Abstract

The invention provides a membrane electrode assembly of a fuel cell. The membrane electrode assembly comprises a gas diffusion layer, a micro-porous layer, a catalysis layer and an electrolyte membrane which are successively overlapped; in a direction of an air flow path, the thickness of the micro-porous layer is gradually reduced, the thickness of the catalysis layer is gradually increased, andthe total thickness of the micro-porous layer is consistent with the total thickness of the catalysis layer. The invention also provides a production method of the membrane electrode assembly of the fuel cell. The membrane electrode assembly of the fuel cell has the functions of balancing the content of water in areas of a gas inlet and a gas outlet of the fuel cell, finally improving the stability of the fuel cell under various temperatures and humidities, improving durability, reducing the catalyst loading capacity, and the like.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell membrane electrode assembly and a preparation method thereof. Background technique [0002] Due to the advantages of high energy conversion efficiency, low emission and no pollution, fuel cells have broad prospects for development in the fields of transportation, backup power, and distributed power stations. A typical fuel cell cell consists of an electrolyte membrane (typically a proton exchange membrane), catalytic electrodes for the cathode and anode, a gas diffusion layer, and bipolar plates. Gas diffusion media in fuel cells typically consist of a conductive porous substrate such as carbon fiber paper or carbon cloth, with a microporous layer attached to it. The microporous layer usually includes carbon powder and hydrophobic fluoropolymer, which plays a role in drainage and ventilation and enhances electron transport capabilities. The microporous layer plays...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004
CPCH01M8/1004Y02E60/50Y02P70/50
Inventor 万年坊丁叁叁张文超李克雷李艳昆
Owner CRRC QINGDAO SIFANG CO LTD
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