Electrode production of fuel battery membrane with proton exchange membrane

A technology of fuel cell membrane and proton exchange membrane, which is applied to fuel cell parts, solid electrolyte fuel cells, fuel cells, etc., can solve the problem of inability to ensure the complete transfer of the catalytic layer, the flattening of the catalytic layer, the influence of electrode performance, and the tendency to stick to the catalyst. layer and other issues, to achieve easy operation, improved performance, and good reproducibility

Active Publication Date: 2005-12-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this preparation method, there are many steps, and the operation is more complicated, and when the transfer sheet is peeled off, part of the catalytic layer is easily stuck on the sheet, so that the complete transfer of the catalytic layer and the smoothness of the catalytic layer cannot be guaranteed. thus affecting the electrode performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The carbon paper is immersed in a 10% concentration of PTFE emulsion, then dried at 50°C, and then placed in a muffle furnace. The temperature is raised to 240°C for 30 minutes, and then the temperature is increased to 360°C for 30 minutes. Conductive substrate. Mix VXC-72 carbon black and PTFE emulsion uniformly into a slurry, in which the percentage of PTFE is 10%, and then apply the slurry to the conductive substrate by spraying method, dry at 40℃, and then put it in the furnace to raise the temperature first Heat for 30 minutes at 240°C, then continue to heat up to 360°C for 30 minutes. After cooling to room temperature, heat the conductive substrate with carbon black at a temperature of 120°C and a pressure of 1MPa for 100 Second, a gas diffusion layer is formed. After the hot pressing is completed, in order to prevent the gas diffusion layer from deforming, the gas diffusion layer is naturally cooled while maintaining a pressure of 1 MPa. The thickness of the gas diff...

Embodiment 2

[0025]The carbon paper is immersed in a 5% concentration of PTFE emulsion, then dried at 60°C, and then placed in a muffle furnace. The temperature is raised to 250°C for 20 minutes, and then the temperature is increased to 350°C for 15 minutes. Conductive substrate. Then mix the acetylene black and PTFE emulsion uniformly into a slurry, in which the percentage of PTFE is 20%, and then apply the above slurry to the conductive substrate by spraying. After drying at 80°C, it is then placed in a furnace to first raise the temperature to 250 ℃, keep for 20 minutes, then continue to heat up to 350℃, keep for 15 minutes, after cooling to room temperature, then heat the conductive substrate with carbon black at a temperature of 100 ℃ under 0.5MPa pressure for 30 seconds , Form a gas diffusion layer. After the hot pressing is completed, in order to prevent the gas diffusion layer from deforming, the gas diffusion layer is cooled with water while maintaining a pressure of 0.5 MPa. The thic...

Embodiment 3

[0029] The carbon cloth was soaked in a 35% PTFE emulsion, then dried at 80°C, and then placed in a muffle furnace. The temperature was raised to 290°C for 15 minutes, and then the temperature was increased to 340°C for 20 minutes. Conductive substrate. Then mix the acetylene black and PTFE emulsion uniformly into a slurry, where the percentage of PTFE is 40%, and then apply the above slurry to the conductive substrate by spraying, and then dry it at 20°C, then put it in a furnace to first raise the temperature to 290 ℃, keep for 15 minutes, then continue to heat up to 340℃, keep for 25 minutes, after cooling to room temperature, then heat-press the conductive substrate with carbon black at a temperature of 20℃ and a pressure of 5MPa for 300 seconds. A gas diffusion layer is formed. After the hot pressing is completed, in order to prevent the gas diffusion layer from deforming, the gas diffusion layer is cooled with water while maintaining a pressure of 5 MPa. The thickness of the...

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Abstract

The method includes following steps: 1) the carbon paper or carbon fabric is dipped in PTFE latex, and then dried to get conduction base; 2) the VXCʔ72 carbon black or acetylene black is mixed with PTFE latex to form synthetic size that is coated on the conducting base; after drying, forms a gas diffusion layer; 3) prepares catalyst slurry; 4) the catalyst slurry is coated on the diffused layer; after hot pressing, it is cooled at the condition of keeping pressure, and the gas diffusion electrode is formed; 5) the Nafion film is set between two gas diffusion electrodes with catalysis layer; after hot pressing, it is cooled at the condition of keeping pressure.

Description

Technical field [0001] The invention relates to a method for preparing fuel cell electrodes, in particular to a method for preparing a membrane electrode assembly of a proton exchange membrane fuel cell. Background technique [0002] The proton exchange membrane fuel cell is a device that generates electric energy by electrochemically reacting a fuel that produces hydrogen ions with an oxidizing gas such as oxygen or air. It has the advantages of low noise, high energy conversion efficiency, and no environmental pollution. It is one of the ideal power sources in the future. It can be used in small portable power supplies, small household power stations, and power supplies for electric vehicles. [0003] The core component of the proton exchange membrane fuel cell is the membrane electrode assembly. It is the electrochemical reaction site of the fuel cell. It needs to have both proton and electron conduction functions. Its structural performance is very important to the overall pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/12H01M4/86H01M4/88H01M4/92H01M8/02H01M8/10
CPCH01M4/8605H01M4/8807H01M4/8817H01M4/8896H01M4/926H01M8/0234H01M8/1004H01M2008/1095Y02P70/50Y02E60/50
Inventor 张日清董俊卿
Owner BYD CO LTD
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