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Ice-resistant water repellent agent for fuel cell, microporous layer slurry and GDL and preparation method thereof

A fuel cell and hydrophobic agent technology, applied in fuel cells, chemical instruments and methods, battery electrodes, etc., can solve problems such as reducing PEMFC power generation efficiency, MEA performance attenuation, and limiting application environments, so as to increase preparation costs and reduce icing Temperature, the effect of improving the preparation efficiency

Pending Publication Date: 2022-03-08
DONGFENG MOTOR GRP
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Problems solved by technology

Literature reports (Zhan Z G, Lyu Z Y, Huang Y, et al.Research on PEMFC start-up at subzero temperature and performance decay[J].Journal ofWuhan University of Technology,2011,33(1):151-155.) at low temperature Under certain conditions, the water generated in the membrane electrode is prone to freezing. When the water turns into ice, the volume will increase, thereby squeezing the gas diffusion layer, causing tearing and damage to the gas diffusion layer.
In addition, too much water produced by the reaction not only increases the possibility of freezing, but also causes water flooding of the MEA, blocks the pores on the gas diffusion layer, and affects gas conduction
GDL damage will lead to a sharp decline in the performance of the MEA and reduce the power generation efficiency of the PEMFC
[0004] In the prior art, such as Chinese invention patent application CN200610047230.9, a method for improving the adaptability of a fuel cell to a sub-zero environment provides a method for evacuating the hydrogen chamber and oxygen chamber of the fuel cell to remove the gas in the battery flow field and the gas diffusion layer. water, so that the battery can maintain integrity and long enough life at sub-zero temperatures, and improve the antifreeze ability of PEMFC; but this method needs to be equipped with a vacuum pump, which is costly, and the supporting vacuum pump increases the volume of the fuel cell, limiting its application environment

Method used

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  • Ice-resistant water repellent agent for fuel cell, microporous layer slurry and GDL and preparation method thereof
  • Ice-resistant water repellent agent for fuel cell, microporous layer slurry and GDL and preparation method thereof
  • Ice-resistant water repellent agent for fuel cell, microporous layer slurry and GDL and preparation method thereof

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preparation example Construction

[0050] According to a typical embodiment of the present invention, a method for preparing a GDL for a fuel cell is provided, the method comprising:

[0051] S1. Add Zn(NO 3 ) 2 , urea and Co(NO 3 ) 2 Dissolved in the first solvent to obtain a mixed solution;

[0052] S2. NH 4 F is dissolved in the mixed solution, followed by hydrothermal reaction to obtain a white powder;

[0053] S3. drying the white powder to obtain an anti-ice hydrophobic agent;

[0054] Specifically, a certain amount of Zn(NO 3 ) 2 , urea, Co(NO 3 ) 2 Dissolve in deionized water and stir with a glass rod until completely dissolved. Then add a certain amount of NH to the solution 4 F, continue to use the glass rod until completely dissolved. Pour the solution into the reaction kettle, place the reaction kettle in an oven for reaction, after a certain period of reaction, take the muffle furnace out of the oven, leave the white powder and dry it, and get ZnO / co 3 o 4 Composite materials (i.e. ...

Embodiment 1

[0078] A preparation method of GDL for a fuel cell, the method comprising:

[0079] First weigh 1g of Zn(NO 3 ) 2 , 1g urea, 1gCo(NO 3 ) 2 Dissolve in 20mL deionized water and stir with a glass rod until completely dissolved. Then add 0.2 g of NH4F to the solution, and continue to use the glass rod until completely dissolved. Then the solution was poured into the reaction kettle, and the reaction kettle was placed in an oven for reaction. The temperature of the oven was set at 120°C. After 4 hours of reaction, the muffle furnace was taken out from the oven, and the white powder was left and dried. ZnO / Co can be obtained after drying 3 o 4 composite material. Then take 1g of graphene oxide, pour it into 8g of absolute ethanol, add 0.2g of binder, stir, then add 0.5g of ZnO / Co 3 o 4 For the composite material, the mixed solution was stirred in a magnetic stirrer with a stirring speed of 1000 r / min and a stirring time of 60 min to obtain a microporous layer slurry.

[0...

Embodiment 2

[0082] A preparation method of GDL for a fuel cell, the method comprising:

[0083] First weigh 1g of Zn(NO 3 ) 2 , 3g urea, 0.8gCo(NO 3 ) 2 Dissolve in 20mL deionized water and stir with a glass rod until completely dissolved. Then add 0.4 g of NH to the solution 4 F, continue to use the glass rod until completely dissolved. Then the solution was poured into the reaction kettle, and the reaction kettle was placed in an oven for reaction. The temperature of the oven was set at 130°C. After 4 hours of reaction, the muffle furnace was taken out from the oven, and the white powder was left and dried. ZnO / Co can be obtained after drying 3 o 4composite material. Then take 1g of graphene oxide, pour it into 15g of absolute ethanol, add 0.4g of binder, stir, then add 0.7g of ZnO / Co 3 o 4 For the composite material, the mixed solution was stirred in a magnetic stirrer with a stirring speed of 1000 r / min and a stirring time of 60 min to obtain a microporous layer slurry.

[...

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Abstract

The invention particularly relates to an ice-resistant water repellent agent for a fuel cell, microporous layer slurry and GDL and a preparation method thereof, and belongs to the technical field of fuel cells, the method comprises the following steps: dissolving Zn (NO3) 2, urea and Co (NO3) 2 in a first solvent to obtain a mixed solution; dissolving NH4F in the mixed solution, and then carrying out hydrothermal reaction to obtain white powder; and drying the white powder to obtain the ice-resistant water repellent agent. The composition of the ice-resistant water repellent agent is a Zn (NO3) 2 and Co (NO3) 2 composite material, the material is in a microsphere shape, has a structure with a super-smooth surface, and can enable GDL to have super-hydrophobic performance, and meanwhile, the introduction of the ice-resistant water repellent agent can significantly reduce the icing temperature of water, so that the GDL has ice-resistant performance. And secondly, due to the introduction of the material, a traditional water repellent agent is not used for soaking in the preparation process of the GDL, so that the preparation efficiency is improved, and the preparation cost is reduced. Finally, the ice-resistant and super-hydrophobic GDL designed by the method has no obvious difference from commercial carbon paper in conductivity, and other properties of the GDL are not reduced.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to an anti-icing hydrophobic agent, a microporous layer slurry and a GDL for a fuel cell and a preparation method thereof. Background technique [0002] Energy security is a crucial issue. Traditional petroleum, coal and other chemical energy sources are being exhausted day by day, and an alternative clean energy source is urgently needed. Hydrogen energy is a clean energy that is considered to be a promising alternative to the above-mentioned chemical energy. A proton exchange membrane fuel cell is a device that uses hydrogen energy to generate electricity. It is composed of many membrane electrodes and bipolar plates. Membrane electrode is composed of gas diffusion layer, catalytic layer and proton exchange membrane. Among them, the gas diffusion layer is the core component, which plays the role of gas conduction, drainage and conduction. It can conduct the gas ...

Claims

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Application Information

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IPC IPC(8): C09K3/18H01M4/88H01M8/0243H01M8/0245
CPCC09K3/18H01M4/8807H01M8/0243H01M8/0245Y02E60/50
Inventor 高佳武唐雪君张泽王智捷周江峰
Owner DONGFENG MOTOR GRP
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