Fuel cell membrane electrode and its preparation method

A fuel cell membrane and membrane electrode technology, applied in the direction of fuel cells, battery electrodes, fuel cell components, etc., can solve the problems of poor self-humidification effect of membrane electrodes and low battery output power, etc., and achieve good effects and output power. Improve the effect of simple and easy preparation method

Inactive Publication Date: 2008-07-02
BYD CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defect that the fuel cell membrane electrode with self-humidification function in the prior art is complicated to prepare, and the poor self-humidification effect of the membrane electrode leads to the low output power of the battery under high current density, and provides a preparation The method is simple, and the self-humidification effect of the membrane electrode is good, so that the fuel cell has a higher output power under a large current density. The fuel cell membrane electrode and its preparation method
Although various methods are also used in the prior art to improve the catalyst, such as increasing the inorganic nanoparticle water retention layer on the catalytic layer, the above problems still cannot be avoided.

Method used

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  • Fuel cell membrane electrode and its preparation method

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preparation example Construction

[0027] According to the preparation method of the fuel cell membrane electrode provided by the present invention, the preparation method of the gas diffusion layer includes coating the conductive paste containing the conductive agent and the binder on the conductive support to obtain the diffusion layer, wherein the anode is prepared The binder in the conductive paste of the gas diffusion layer is a hydrophilic binder, and the hydrophilic binder may be a sulfonic acid resin and / or a fluorinated sulfonic acid resin, preferably a fluorinated sulfonic acid resin.

[0028] The above-mentioned hydrophilic binder is usually used in the form of an emulsion, for example, may be an aqueous or alcoholic solution of a sulfonic acid resin and / or a fluorinated sulfonic acid resin. The alcohol may be selected from various conventional alcohols in the art, such as one or more of isopropanol, ethanol and glycerol. The solid content of the binder in the hydrophilic binder emulsion is 1-50% by ...

Embodiment 1

[0050] This embodiment illustrates the preparation of the fuel cell membrane electrode provided by the invention

[0051] (1) Carbon paper (TGP-H-90, Toray company) was first sintered at 400°C for 40 minutes, then immersed in polytetrafluoroethylene (PTFE) emulsion (solid content was 8% by weight) for 15 minutes, and then Dry at room temperature and keep warm at 360° C. for 30 minutes to obtain a hydrophobically treated gas diffusion layer.

[0052]0.2 parts by weight of carbon black (Vulcan XC72R, Cabot company), 0.5 parts by weight of perfluorosulfonic acid resin Nafion resin solution (nafion dispersion liquid DE520, DuPont products, wherein the solid content of perfluorosulfonic acid resin is 5% by weight), Mix 10 parts by weight of deionized water and 2 parts by weight of ethanol, ultrasonically disperse for 30 minutes to obtain a carbon dispersion, and then coat the carbon dispersion on the above-mentioned gas diffusion layer. After drying at 100°C, the weight gain of the...

Embodiment 2

[0057] This embodiment illustrates the preparation of the fuel cell membrane electrode provided by the invention

[0058] Prepare the membrane electrode according to the method of Example 1, the difference is that when preparing the anode gas diffusion layer, when the carbon paper is subjected to hydrophobic treatment and coated with the carbon dispersion, the hydrophilic binder in the carbon dispersion It is 0.5 parts by weight of Nafion resin solution (the product of DuPont, wherein the solid content of perfluorosulfonic acid resin is 10% by weight). The membrane electrode a2 is obtained.

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Abstract

The invention relates to a membrane electrode of a fuel cell, which comprises an anode gas diffusing layer, an anode catalyzing layer, a proton exchange membrane, a cathode catalyzing layer, and a cathode gas diffusing layer. The gas diffusing layers comprise a conductive carrier as well as a conductive agent and a binding agent carried by the conductive carrier, wherein the binding agent in the anode gas diffusing layer is a hydrophilic binding agent. The membrane electrode of the fuel cell provided by the invention has good effect of self-humidifying. When the fuel cell manufactured by adopting the membrane electrode in the invention works in a large current density, the output power of the cell is high.

Description

technical field [0001] The present invention relates to a membrane electrode and its preparation method, more specifically to a fuel cell membrane electrode and its preparation method. Background technique [0002] A fuel cell is an energy conversion device that converts chemical energy stored in fuels (such as hydrogen, lower alcohols, etc.) and oxidants (oxygen) into electrical energy according to electrochemical principles. Fuel cells have the advantages of high energy conversion rate and environmental friendliness, while Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of low temperature operation and high specific power, and is a new type of power source widely used. [0003] The reaction formulas of the anode reaction and the cathode reaction of the fuel cell using hydrogen as fuel are shown in the reaction formulas (1) and (2) respectively, and the oxygen used as the oxidant on the cathode is usually from the air. The ion conduction that transfers the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02H01M4/88H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 翟玉清
Owner BYD CO LTD
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