Gas diffusion layer used for fuel cell with proton exchange film, production and application thereof

A technology of gas diffusion layer and proton exchange membrane, which is applied to fuel cell components, solid electrolyte fuel cells, fuel cells, etc., can solve problems such as difficult to eliminate, low capillary pressure, and easy to be accumulated inside the base layer, etc., to achieve Improving battery performance and reducing the effect of mass transfer polarization

Inactive Publication Date: 2009-04-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid water in the diffusion layer is mainly transmitted by capillary pressure. According to the Kelvin equation, the larger the contact angle, the greater the capillary pressure. However, the traditional impregnation hydrophobization method often makes the two sides of the base layer contain more hydrophobic agents, while the in

Method used

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  • Gas diffusion layer used for fuel cell with proton exchange film, production and application thereof
  • Gas diffusion layer used for fuel cell with proton exchange film, production and application thereof
  • Gas diffusion layer used for fuel cell with proton exchange film, production and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 100mg of 60% PTFE emulsion, add 5.9g of deionized water, and ultrasonically vibrate for 10 minutes to prepare a uniformly dispersed water-repellent slurry, and then spray the slurry evenly on one side of the cut carbon paper, and spray in multiple layers. The next layer was sprayed after drying the first layer, weighed so that the total water-repellent mass percentage in the base layer was 10wt.%, and finally the prepared gas diffusion base layer was placed in a high-temperature firing furnace and incubated Burn for 30 minutes. Prepare the prepared gas diffusion base layer according to the traditional method to prepare the upper microporous layer as the gas diffusion layer, and finally place the prepared cathode and anode diffusion layers on both sides of the proton exchange membrane with the catalytic layer, at 120 ° C, 1.0 Under the condition of MPa, hot press for 30 minutes to make a membrane-electrode three-in-one assembly. Place this component on both sides o...

Embodiment 2

[0037] Take 100mg of 60% PTFE emulsion, add 5.9g of deionized water, and ultrasonically vibrate for 10 minutes to prepare a uniformly dispersed water-repellent slurry, and then spray the slurry evenly on one side of the cut carbon paper, and spray in multiple layers. The next layer was sprayed after the layer was dried, weighed so that the total water repellent mass percentage in the base layer was 20wt.%, and finally the prepared gas diffusion base layer was placed in a high-temperature firing furnace, and incubated Burn for 30 minutes. A single cell was assembled according to the method of Example 1. Battery performance curve see Figure 6 .

Embodiment 3

[0039] Take 100mg of 60% PTFE emulsion, add 5.9g of deionized water, and ultrasonically vibrate for 10 minutes to prepare a uniformly dispersed water-repellent slurry, and then spray the slurry evenly on one side of the cut carbon paper, and spray in multiple layers. The next layer was sprayed after the layer was dried, weighed so that the total water-repellent mass percentage in the base layer was 30wt.%, and finally the prepared gas diffusion base layer was placed in a high-temperature firing furnace and incubated Burn for 30 minutes. A single cell was assembled according to the method of Example 1. Battery performance curve see Figure 7 .

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Abstract

The invention relates to a gas diffusion layer for a proton exchange membrane fuel cell, wherein, the gas diffusion layer is composed of a basal cell layer and a microporous layer, wherein, the total weight percentage content of a hydrophobic agent in the basal cell layer is 1-50 percent; and the hydrophobic nature in the basal cell layer shows the gradient decrease from the side of the microporous layer to the side of a flow field. The preparation steps are as follows: a) the hydrophobic agent is evenly dispersed in a solvent to form slurry; b) the slurry is evenly prepared to the surface of a porous conductive basal cell layer material from one side, the slurry is sunk into the basal cell layer material under the action of gravity and viscous force, thereby realizing the gradient distribution in the basal cell layer; c) the basal cell layer of a gas diffusion electrode is formed by baking for 20-40 minutes at 300-400 DEG C. The gas diffusion layer is applied to hydrogen-oxygen proton exchange membrane fuel cells and direct alcohol fuel cells, as well as cells, electrolytic cells and sensors with the gas diffusion electrode structures. As the gas diffusion layer adopts the gradient hydrophobization, the gas diffusion layer is conductive to the discharge of water which is a cathode product and improves the cell performance.

Description

technical field [0001] The invention relates to a gas diffusion layer for a proton exchange membrane fuel cell. [0002] The present invention also relates to a method for preparing the above-mentioned gas diffusion layer. [0003] The invention also relates to the use of the gas diffusion layers described above. Background technique [0004] Due to its high efficiency and environmental friendliness, proton exchange membrane fuel cells have been paid close attention to by research institutions in various countries in recent years. Its core component, the three-in-one membrane electrode (MEA) assembly, is usually composed of a gas diffusion layer, a catalytic layer, and a proton exchange membrane. The gas diffusion layer is composed of a single base layer or a base layer and a microporous layer, and has multiple functions such as supporting the catalytic layer, collecting current, conducting reaction gas, and discharging product water. The diffusion layer can effectively r...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/10H01M8/0245H01M8/1007H01M8/1011
CPCY02E60/522Y02E60/50Y02P70/50
Inventor 孙公权高妍王素力孙海毛庆叶瑷玮辛勤
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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