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Gas diffusion layer for proton exchanging film fuel cell and its preparing method

A technology of gas diffusion layer and proton exchange membrane, which is applied to the components of fuel cells, solid electrolyte fuel cells, fuel cells, etc. Problems such as carbon powder morphology and structure, to achieve reasonable water and gas distribution, easier discharge, and good stability

Inactive Publication Date: 2007-06-27
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The interaction between these surface groups and organic solvent molecules can affect the morphology and structure of the carbon powder in the solvent, and ultimately affect the microstructure and hydrophilic / hydrophobic properties of the microporous layer, resulting in a decrease in the water management capacity of the microporous layer.
[0017] Therefore, the process of preparing the microporous layer by the wet method is complicated, and the surface of the microporous layer is easy to form macropores and the thickness of the microporous layer is relatively thick.
These problems lead to hindered water-gas mass transfer in the gas diffusion layer of the proton exchange membrane fuel cell, resulting in a decrease in the performance of the cell

Method used

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  • Gas diffusion layer for proton exchanging film fuel cell and its preparing method
  • Gas diffusion layer for proton exchanging film fuel cell and its preparing method
  • Gas diffusion layer for proton exchanging film fuel cell and its preparing method

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Experimental program
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Effect test

Embodiment 1

[0047] The gas diffusion layer includes a porous support layer and a microporous layer, the porous support layer is a mesh and porous structure, the microporous layer is compounded on the surface of the porous support layer near the catalyst layer, and the microporous layer has micropores; The microporous layer evenly covers the macropore and fiber dense area of ​​the porous support layer, and does not go deep into the interior of the porous support layer.

[0048] PTFE emulsion (Daikin Industries Co., Ltd., concentration 60%) was diluted to 5%, then carbon paper (Toray TGPH-060) was put into the prepared PTFE emulsion and soaked for 5 minutes, and dried in the air. Repeat 5 times until the content of PTFE reaches 20%, and put it into a 60°C oven for 1 hour to dry. Then put it in a furnace at 360°C for 60 minutes.

[0049] Weigh 0.7g conductive carbon black (Vulcan XC-72, Cabot Co. particle size 30nm) and 0.3g PTFE powder (Daikin Industries Co., Ltd.) respectively, put them i...

Embodiment 2

[0053] The PVDF emulsion (Daikin Industry Co., Ltd.) was diluted to 10%, and then carbon paper (Toray TGPH-060) was put into the prepared PVDF emulsion to soak for 5 minutes, and then air-dried. Repeat 5 times until the content of PVDF is 30%, put it into a 60°C oven for 1 hour to dry. Then put it in an oven at 190°C for 55 minutes.

[0054] Weigh 1g of conductive carbon black (Acetylene Black, Henan, particle size 40nm) and 0.1g of PVDF powder (Daikin Industry Co., Ltd.) respectively, put them into a grinder, and grind for 1 minute (25000 rpm).

[0055] Scrape-coat the treated carbon powder + PVDF dry powder onto the surface of the hydrophobically treated carbon paper, the load of carbon powder is 0.8mgcm -2 . After rolling, put the treated carbon paper into the furnace, N 2 Protection, 170 ° C treatment for 55 minutes.

[0056] The prepared gas diffusion layer and membrane electrode CCM (self-made) assembled cells were tested, and the assembled MEA is shown in Figure 2. ...

Embodiment 3

[0058] Polytetrafluoroethylene (PTFE) emulsion (Daikin Industry Co., Ltd., concentration 60%) was diluted to 10%, then carbon paper (Toray TGPH-060) was put into the prepared PTFE emulsion and soaked for 5 minutes, and air-dried Dry. Repeat several times until the content of PTFE is 5%, 15%, 30% and 40% respectively. Dry the carbon paper in an oven at 60°C for 1 hour, and then put it in an oven at 340°C for 50 minutes.

[0059] Weigh 1g conductive carbon black (Vulcan XC-72, Cabot Co. particle size 30nm) and 0.01g polytetrafluoroethylene (PTFE) powder (Daikin Industry Co., Ltd.) / minute).

[0060] Squeegee-coat the treated carbon powder + PTFE dry powder onto the surface of the hydrophobically treated carbon paper, the amount of carbon powder is 1.0mgcm -2 . After rolling, put the treated carbon paper into the furnace, N 2 protection, 330°C for 50 minutes.

[0061] The prepared gas diffusion layer and membrane electrode CCM (self-made) assembled cells were tested, and th...

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Abstract

This invention relates to a gas diffusion layer used in proton exchange film fuel cells and its preparation method, in which, the gas diffusion layer includes a multihole supporting layer and a microhole layer, the multihole supporting layer is a net and porous structure, the microhole layer is composited on the surface of the porous supporting layer closing to the catalyzed layer and covers the surface of the large hole and fiber dense region of the supporting layer uniformly but not penerates into the inside of the supporting layer, which applies a drying method to prepare a gas diffusion layer used in proton exchange membrane fuel cells, and polymr 1 and 2 containing FI is either a same kind or different, and the hydrophile / hydrophobic degree of the two layers is adjustable, so the gas diffusion layer structure is matched with the running condition of the fuel cell and discharges water more easily.

Description

technical field [0001] The invention relates to a gas diffusion layer for a fuel cell, in particular to a gas diffusion layer for a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] The proton exchange membrane fuel cell directly converts the chemical energy stored in the fuel (hydrogen) and oxidant (oxygen) into electrical energy, and is a highly efficient and environmentally friendly power generation device. The working mode of the proton exchange membrane fuel cell is that the fuel and oxidant required for the battery reaction are stored outside the battery. When the battery is working, the reaction gas needs to be continuously fed into the battery and the water formed during the reaction is removed. The gas diffusion layer and the flow field constitute the mass transfer channel of the proton exchange membrane fuel cell. [0003] The gas diffusion layer is located between the flow field and the catalytic layer. Its main fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/02H01M8/10H01M8/1004
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 陈剑张华民徐海峰衣宝廉
Owner SUNRISE POWER CO LTD
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