Gaseous diffusion layer of proton exchange membrane fuel cell and preparation method thereof

A gas diffusion layer and proton exchange membrane technology, which is applied to fuel cell components, fuel cells, electrical components, etc., can solve problems such as the gap between the microporous layer and the base layer, and the unfavorable discharge of generated water, so as to increase power and improve Gas Diffusion Layer, Effect of Improving Operating Operating Points

Inactive Publication Date: 2011-04-20
SUNRISE POWER CO LTD
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Problems solved by technology

However, the commonly used gas diffusion layer has a large gap in porosity between the microporous layer and the base layer, which is especially unfavorable for the discharge of generated water.

Method used

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  • Gaseous diffusion layer of proton exchange membrane fuel cell and preparation method thereof
  • Gaseous diffusion layer of proton exchange membrane fuel cell and preparation method thereof

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 As shown, a gas diffusion layer of a proton exchange membrane fuel cell includes a base layer 1 and a microporous layer, and the microporous layer is composed of a microporous lining layer 2 and a microporous surface layer 3 . The base layer 1 is made of large-diameter carbon paper or carbon cloth, and then treated with PTFE and fired at high temperature; the mass percentage of PTFE in the base material after hydrophobic treatment is 10% to 20%. The microporous liner 2 is located between the base layer 1 and the microporous surface layer 3, the microporous liner 2 is a microporous layer with relatively large porosity and strong hydrophobicity, and the microporous surface layer 3 is connected with the microporous liner 2. Compared to microporous layers with less porosity and less hydrophobicity. The thickness of the first microporous layer is 5-10 μm, a...

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Abstract

The invention discloses a gaseous diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof. The diffusion layer comprises a basal layer and a micropore layer, and the micropore layer consists of a micropore lining layer and a micropore surface layer. The micropore lining layer is located between the basal layer and the micropore surface layer, the micropore lining layer is the micropore layer with larger porosity and stronger hydrophobicity, and the micropore surface layer the micropore layer with smaller porosity and weaker hydrophobicity in comparison with the micropore lining layer. The preparation method comprises the steps of: water-repellency treatment, slurry preparation, micropore layer coating and roasting at high temperature. Because gas diffuses from the basal layer to the micropore layers in the fuel cell reaction, by manufacturing the micropore layers in the gaseous diffusion layer step by step in the invention, gradient decrease is formed between the porosities from the basal layer to the two micropore layers in the gaseous diffusion layer, which is more beneficial to the diffusion of reaction gas and the discharge of water generated by the cell, and the power of the cell can be obviously improved.

Description

technical field [0001] The invention relates to a preparation technology of a proton exchange membrane fuel cell, in particular to a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] A proton exchange membrane fuel cell is a power generation system that generates direct current through the electrochemical reaction of hydrogen and oxygen. The specific reaction process is: [0003] 2H 2 →4H + +4e - (1) [0004] o 2 +4e - →2O 2- +4H + →2H 2 O (2) [0005] Equation (1) represents the oxidation reaction taking place at the anode. During this process hydrogen molecules are converted into protons and electrons, and the protons are conducted to the cathode. Equation (2) represents the reduction reaction that takes place at the cathode. In this process, oxygen atoms accept electrons to become oxygen ions, which react with hydrogen protons from the anode to form water molecules. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 赵恩介侯中军邢丹敏李奇
Owner SUNRISE POWER CO LTD
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