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A kind of hydrogen fuel cell gas diffusion layer with double microporous layer structure and preparation method thereof

A technology of gas diffusion layer and microporous layer, which is applied in the direction of fuel cells, structural parts, electrical components, etc., can solve the problem of the limited scope of the comprehensive performance of gas diffusion layer fuel cells, the limited space for selecting the particle size of carbon powder materials, and the problem of gas diffusion. The gradient of layer pore size distribution is not obvious, etc., to achieve the effect of facilitating processing and assembly, optimizing internal and surface structure, and facilitating transmission

Active Publication Date: 2022-07-12
SHANDONG RENFENG SPECIAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size of carbon powder is generally in the range of 30-40nm, and the particle size selection space of carbon powder material is limited. The double microporous layer prepared by using carbon powder with different particle sizes will make the pore size distribution gradient of the gas diffusion layer different. Obviously, there is a limit to improving the drainage capacity of the gas diffusion layer and the comprehensive performance of the fuel cell.

Method used

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  • A kind of hydrogen fuel cell gas diffusion layer with double microporous layer structure and preparation method thereof
  • A kind of hydrogen fuel cell gas diffusion layer with double microporous layer structure and preparation method thereof
  • A kind of hydrogen fuel cell gas diffusion layer with double microporous layer structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Preparation of carbon paper support layer

[0064] First, the carbon paper base paper was prepared by wet papermaking process, and the basis weight was 43±5g / m 2 Second, the base paper is dipped and coated with thermosetting phenolic resin, and the coating weight is 1 times that of the base paper; again, the hot-pressing curing process is carried out, the hot-pressing pressure is 5MPa, the hot-pressing temperature is 180 ℃, and the hot-pressing time is 20min; The substrate is carbonized and graphitized, the carbonization temperature is 1200 °C, the carbonization time is 1 h, the graphitization temperature is 2200 °C, and the graphitization time is 1 h, and finally a carbon paper product as a support layer is obtained.

[0065] (2) Preparation of slurry

[0066] A. Preparation of carbon paper hydrophobic treatment slurry: take 60wt% aqueous polytetrafluoroethylene (PTFE) emulsion, add deionized water to dilute to 10wt% PTFE, stir evenly at medium or low speed for us...

Embodiment 2

[0080] (2) Preparation of slurry

[0081]B. Preparation of the first microporous layer coating slurry: Mix carbon fiber powder, sodium carboxymethyl cellulose, benzenesulfonyl hydrazide foaming agent, and deionized water in a ratio of 15:2:3:80 to prepare for use. Transfer to a foam slurry storage device for use, and keep stirring at a low speed to ensure good distribution of carbon fiber powder in the foam, and the concentration of the slurry is 15wt%.

[0082] Other steps are the same as in Example 1.

[0083] The performance parameters of the final gas diffusion layer product are shown in Table 1.

Embodiment 3

[0085] (2) Preparation of slurry

[0086] C. Preparation of the second microporous layer coating slurry: First, ethanol, isopropanol and water were mixed uniformly in a ratio of 4:4:2; In the mixed solvent of isopropyl alcohol / water, the ratio of carbon powder to mixed solvent is 1:9, and the concentration of carbon powder is 10wt%; use a double planetary mixer to stir at a low speed of 300rpm at room temperature, and wait until the carbon powder is completely covered by alcohol. After the solution is wrapped, the high-speed shearing and dispersing is carried out at a rotating speed of 1500 rpm, and finally the carbon powder and the solvent are fully mixed to obtain a continuous and uninterrupted uniform black oily liquid; 10wt% sodium chloride aqueous solution is then added. 3wt%, stir evenly at medium speed (800rpm); finally, weigh 10wt% of the PTFE suspension with 43wt% of the carbon powder consumption (according to the solute), add it to the mixed solution, keep stirring a...

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Abstract

The invention provides a gas diffusion layer with a double microporous layer structure, the double microporous layer comprises a first microporous layer and a second microporous layer, the first microporous layer is close to the support layer and has a thickness of A carbon fiber powder layer of 10-20 μm; the second microporous layer is in direct contact with the catalytic layer, and a carbon powder layer with a thickness of 10-30 μm. The surface of the microporous layer has both nano- and micro-scale pores with high flatness, which is conducive to reducing the contact resistance; the gas diffusion layer forms gradient pores with gradually decreasing pore size from the support layer to the carbon fiber powder layer and then to the carbon powder layer. On the one hand, adjust the pore structure distribution of the microporous layer to improve the water vapor management ability; on the other hand, optimize the coating formula and performance of the microporous layer, the conductivity of carbon fiber powder is higher than that of carbon powder, and the addition of carbon fiber powder layer can greatly Improve the conductivity of the system and promote the efficient transport of electrons.

Description

technical field [0001] The invention relates to a gas diffusion layer for a hydrogen fuel cell, in particular to an optimized design of a microporous layer of a gas diffusion layer of a proton exchange membrane fuel cell and a preparation method thereof, belonging to the technical field of hydrogen fuel cell materials. Background technique [0002] Hydrogen fuel cells are an important direction for the transformation and upgrading of China's automobile power system and the strategy of new energy vehicles. The "Made in China 2025", "Medium and long-term development plan for the automobile industry" and other plans have listed the development of hydrogen energy and fuel cell technology as key tasks. , and listed fuel cell vehicles as a key support area. [0003] The gas diffusion layer is one of the core materials of the hydrogen fuel cell stack. At present, it mainly relies on imports, which seriously restricts the development of the hydrogen fuel cell industry. During the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/0234H01M8/0245B82Y30/00B82Y40/00
CPCH01M4/8605H01M4/8657H01M4/8807H01M8/0234H01M8/0245B82Y30/00B82Y40/00Y02E60/50
Inventor 汤秀秀宋佃凤郁国强刘娜何冬梅吴立群
Owner SHANDONG RENFENG SPECIAL MATERIALS
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