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Cathode diffusion layer for proton exchange membrane fuel cell, preparation and application thereof

A technology of proton exchange membrane and fuel cell, applied in the field of diffusion layer, can solve the problems of mass transfer obstruction of cathode material, achieve the effect of improving mass transfer capacity, improving battery performance, and simple operation

Active Publication Date: 2012-05-30
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

There is no relevant research on the introduction of substances with oxygen storage properties to form oxygen mass transfer channels in the water-blocked diffusion layer to solve the problem of blocked mass transfer of cathode materials when the battery is operating in self-breathing or low air flow mode

Method used

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  • Cathode diffusion layer for proton exchange membrane fuel cell, preparation and application thereof
  • Cathode diffusion layer for proton exchange membrane fuel cell, preparation and application thereof
  • Cathode diffusion layer for proton exchange membrane fuel cell, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of support layer: Use a gas spray gun to evenly spray PTFE water dispersion with a mass concentration of 1-2% on one side of the carbon paper or carbon cloth. During the spraying process, after spraying a layer of PTFE water dispersion, use a hot air blower to Blow dry, and then continue to spray the next layer until it is loaded with carbon paper or carbon cloth with 10-20wt.% PTFE, and then place it in a muffle furnace for heat treatment at 320-360°C for 1-1.5 h, obtain carbon paper or carbon cloth treated with one-sided hydrophobic treatment, which can be used as a support layer for the diffusion layer;

[0034]Slurry preparation of the microporous layer: carbon powder mass 5wt.% oxygen storage material Gd 0.1 Ce 0.9 o 2 After the powder is mixed with carbon powder, it is dispersed in absolute ethanol with 55 times the mass of carbon powder to form a slurry, which is ultrasonically oscillated for 10 minutes and then 10 wt. Minutes to disperse PTFE even...

Embodiment 2

[0044] The preparation process of the support layer is the same as in Example 1.

[0045] Slurry preparation of the microporous layer: Mix carbon powder mass 5wt.% oxygen storage material CeO2 powder with carbon powder, disperse in 55 times the mass of carbon powder in absolute ethanol to form a slurry, and add 15 The 10wt.% concentration of PTFE water dispersion that is twice the mass of carbon powder, and mechanically stirred for 10 minutes to disperse the PTFE in the slurry evenly.

[0046] Preparation of the diffusion layer: uniformly prepare the microporous layer slurry onto the side of the carbon paper or carbon cloth sprayed with PTFE in the above step (a) by scraping coating. During the scraping process, after each layer of slurry is loaded, The solvent needs to be evaporated before the next layer of loading is carried out, and the above steps are repeated until the carbon powder loading is 2mg / cm 2 , the cathode diffusion layer was prepared after heat treatment at 34...

Embodiment 3

[0050] The preparation process of the support layer is the same as in Example 1.

[0051] Slurry preparation of the microporous layer: carbon powder quality 8wt.% oxygen storage material Ce 0.1 Zr 0.9 o 2 After the powder is mixed with carbon powder, it is dispersed in absolute ethanol with 50 times the mass of carbon powder to form a slurry, which is ultrasonically oscillated for 15 minutes and then added with a PTFE aqueous dispersion of 6 times the mass of carbon powder at a concentration of 5 wt.%. Minutes to disperse PTFE evenly in the slurry.

[0052] Preparation of the diffusion layer: uniformly prepare the microporous layer slurry onto the side of the carbon paper or carbon cloth sprayed with PTFE in the above step (a) by scraping coating. During the scraping process, after each layer of slurry is loaded, The solvent needs to be evaporated before the next layer of loading is carried out, and the above steps are repeated until the carbon powder loading is 1.5mg / cm 2...

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Abstract

The invention relates to a cathode diffusion layer for proton exchange membrane fuel cell, preparation and application thereof. The diffusion layer uses carbon paper or carbon cloth with a single surface treated with hydrophobic treatment as a supporting layer, and a surface treated with hydrophobic treatment of the supporting layer is provided with a micropore layer; the micropore layer comprises oxygen storage material powder, powdered carbon and PTFE, wherein a usage amount of the oxygen storage material powder is 5-10 wt% of powdered carbon, and a usage amount of the PTFE is 0.6-1.6 times of the weight of the powdered carbon. The diffusion layer of the invention has good gas mass transfer performance and can enhance discharging property of a cell under condition of self-breathing or low air intake when used as a cathode diffusion layer of a proton exchange membrane fuel cell. Meanwhile, the diffusion layer prepared by the method has advantages of cheap, easily available and various oxygen storage material and simple preparation technology, etc.

Description

technical field [0001] The invention relates to a diffusion layer of a proton exchange membrane fuel cell, in particular to a cathode diffusion layer for a proton exchange membrane fuel cell and its preparation and application. Background technique [0002] 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 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 support layer and a microporous layer, and has multiple functions such as supporting the catalytic layer, collecting current and conducting reaction gas. [0003] The control of the mass transfer rate of reactants and reaction products by the diffusion layer is crucial to the battery performance. [0004] In practical applications, in ord...

Claims

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Application Information

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IPC IPC(8): H01M4/94H01M4/88
CPCY02E60/50
Inventor 孙公权李咏江高妍王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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