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Gas diffusion layer for fuel cell and its preparation method

A gas diffusion layer and fuel cell technology, which is applied in the parts of fuel cells, solid electrolyte fuel cells, electrical components, etc., can solve the problem that the current density cannot be further improved, and can reduce the Pt load, improve the performance, and reduce the reaction gas. Field uniform effect

Active Publication Date: 2005-08-24
武汉理工新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pore diameters of the microporous layer formed by the above-mentioned patents and documents are different in size, they are all through holes; there is also water entering the electrode hole through the through hole of the porous substrate to the microporous layer, covering the surface of the catalyst, and the current density cannot be reached. Raise the puzzle further

Method used

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  • Gas diffusion layer for fuel cell and its preparation method
  • Gas diffusion layer for fuel cell and its preparation method
  • Gas diffusion layer for fuel cell and its preparation method

Examples

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Effect test

example 1

[0033] Example 1: Dilute polytetrafluoroethylene emulsion (Zhonghao Chenguang Chemical Research Institute, concentration is 60%) to 18%, then put carbon paper (Toray TGPH-060) into the prepared PTFE emulsion for 8min and take it out, Air-dried for 10 minutes, and then placed in a muffle furnace at 350°C for 20 minutes.

[0034] Take by weighing 2g of conductive carbon black (Vulcan XC-72, Cabot Co. particle size 30nm) and 50ml of distilled water and stir in a three-necked flask for 60min, and take by weighing 1.43g of polytetrafluoroethylene emulsion (Zhonghao Chenguang Chemical Research Institute, the concentration is 60%) and diluted to 10 ml with distilled water and added to the above stirred solution. After 30 minutes, 0.33g, 1.23g and 2.86g of ammonium chloride were added respectively, and the resulting mixtures were recorded as S-1, S-2 and S-3 respectively, and the detailed list is shown in Table 1. Continue to stir for 60 minutes, take out the ultrasonic vibration for...

example 2

[0038] Example 2: The hydrophobic treatment of carbon paper is the same as Example 1.

[0039] Weigh 2g of conductive carbon black (Vulcan XC-72, Cabot Co. particle size 30nm) and 50ml of distilled water and stir in a three-necked flask for 60min, weigh 1.43g of polytetrafluoroethylene emulsion (Zhonghao Chenguang Chemical Research Institute, concentration 60%) and diluted to 10 ml with distilled water and added to the above stirred solution. After 30 minutes, 0.33g, 1.23g and 2.86g of lithium carbonate were added respectively, and the formed mixed solutions were respectively recorded as P-1, P-2, and P-3. The detailed list of the mixed solutions is shown in Table 2. Continue to stir for 60 minutes, take out the ultrasonic vibration for 10 minutes and set aside.

[0040] Fix the hydrophobically treated carbon paper with an area of ​​100mm×200mm on the platform of a screen printing machine (PAD PRINTER ENG.CO.LTD, SPP-600FV). When printing, print the mixed solution P-3 first, ...

example 3

[0043] Example 3: The hydrophobic treatment of the carbon paper was the same as in Example 1 (obtaining the straight-through pore structure of the traditional microporous layer).

[0044] Take by weighing 2g of conductive carbon black (Vulcan XC-72, Cabot Co. particle size 30nm) and 50ml of distilled water and stir in a three-necked flask for 60min, and take by weighing 1.43g of polytetrafluoroethylene emulsion (Zhonghao Chenguang Chemical Research Institute, the concentration is 60%) and diluted to 10 ml with distilled water and added to the above stirred solution. After 30 minutes, add 1.23g of ammonium chloride, continue to stir for 60 minutes, take out the ultrasonic vibration for 10 minutes and set aside.

[0045] Fix the hydrophobically treated carbon paper with an area of ​​100mm×200mm on the platform of a screen printing machine (PAD PRINTER ENG.CO.LTD, SPP-600FV), pour out 20ml of the prepared solution, start the machine, and gently press the scraper repeatedly The s...

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Abstract

This invention relates to a gas expanding layer for fuel battery and its making method. The expanding layer includes the multi-hole base materials, the micro-hole layer that compounds on the surface of the multi-hole base materials near the catalyzing layer, the micro-hole layer has holes on it; the characteristics are: the holes of the micro-hole layer are the grads holes, the section of the grad hole is trapezia, the aperture of one end of the grads hole near the multi-hole base material is bigger than that of the other end to make the micro-hole layer have grads hole structure. The method of this invention is to add the hole forming dosage to form the grads. The additive driving power caused by the hole shape of the grads hole on the micro-hole layer make the water let more convenient, the effect much better and improve the fuel's performance.

Description

technical field [0001] The invention relates to a gas diffusion layer for a fuel cell and a preparation method thereof. Background technique [0002] A fuel cell (Fuel Cell) is an electrochemical power generation device, which is different from a battery in the conventional sense. A fuel cell directly converts chemical energy into electrical energy isothermally and electrochemically. It does not go through a heat engine process, so it is not limited by the Carnot cycle, has high energy conversion efficiency (40%-60%), is environmentally friendly, and hardly emits nitrogen oxides and sulfur oxides. Moreover, the emission of carbon dioxide is also reduced by more than 40% compared with conventional power plants. During the operation of the fuel cell, the hydrogen in the anode catalytic layer undergoes an electrode reaction under the action of the catalyst: <chemistry num="001"> <chem file="200510018417_cml001.xml" / > < / chemistry> , the electrons generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/94H01M8/0202H01M8/023H01M8/10
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 潘牧汪圣龙木士春罗志平袁润章
Owner 武汉理工新能源有限公司
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