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Gas diffusion layer for fuel cell and preparation method thereof

A gas diffusion layer, fuel cell technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as affecting the effect of gas transmission and liquid water discharge

Inactive Publication Date: 2020-08-28
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional microporous layer mostly adopts brushing or spraying process. For example, Chinese patents 200510047370.1, 200610047931.2, 200710019376.7 and 201310692107.2 all disperse the conductive material (carbon powder particles) into an organic solvent, and then add PTFE emulsion to form a microporous layer. The slurry is then applied to the surface of the support by spraying or brushing to form a microporous layer. The microporous layer prepared by this process is in a disordered state, which affects the gas transmission and liquid water discharge effect

Method used

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  • Gas diffusion layer for fuel cell and preparation method thereof
  • Gas diffusion layer for fuel cell and preparation method thereof
  • Gas diffusion layer for fuel cell and preparation method thereof

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preparation example Construction

[0026] The invention provides a method for preparing a gas diffusion layer for a fuel cell, comprising the following steps:

[0027] (1) providing an electrospinning solution comprising a conductive material and an electrostatic spraying solution comprising a hydrophobic agent, respectively;

[0028] (2) using the electrospinning solution to carry out electrospinning on the support body, and simultaneously using the electrostatic spray liquid to carry out electrostatic spraying on the support body to obtain a prefabricated body;

[0029] (3) Heat-treating the preform to obtain a gas diffusion layer for a fuel cell.

[0030] The present invention respectively provides an electrospinning solution comprising a conductive material and an electrostatic spraying solution comprising a water-repellent agent. In the present invention, the electrospinning solution includes conductive materials, and the mass concentration of the conductive materials is preferably 5-25%, more preferably ...

Embodiment 1

[0048] Add carbon nanotubes, N,N-dimethylformamide, and polypyrrole into a volumetric flask, and stir evenly to obtain a solution with a total mass fraction of 10% for electrospinning, wherein the mass of carbon nanotubes is 5%. ; A dilute polyvinylidene fluoride solution with a mass fraction of 5‰ was used for electrostatic spraying. Control the voltage of electrospinning and electrostatic spraying to 10kV, the advancing speed of spinning solution is 0.02mL / h, and the advancing speed of spraying solution is 0.4mL / h, and the hydrophobic treated Toray carbon paper is covered on the negative electrode receiving plate to collect the spinning Silk fiber, the distance between the needle tip and the receiving plate is 10cm, by controlling the receiving time, a microporous layer with a thickness of 3μm is obtained; finally, the carbon paper and the microporous layer are placed in a nitrogen-filled oven and sintered at 250°C for 30min to obtain a microscopically ordered structure The ...

Embodiment 2

[0050] Add acetylene black, N,N-dimethylformamide, and polyaniline respectively in the volumetric flask, and stir evenly to obtain a solution with a total mass fraction of 10% for electrospinning, wherein the mass of acetylene black is 7%; A dilute solution of polyvinylidene fluoride and polydimethylsiloxane (mass ratio 1:0.8) with a mass fraction of 6‰ is used for electrostatic spraying. Control the voltage of electrospinning and electrostatic spraying to 15kV, the propulsion speed of spinning solution is 0.2mL / h, and the propulsion speed of spray solution is 2mL / h, and the hydrophobic treated Toray carbon paper is covered on the negative electrode receiving plate to collect the spinning Fiber, the distance between the needle tip and the receiving plate is 15cm, by controlling the receiving time, a microporous layer with a thickness of 3μm is obtained; finally, the carbon paper and the microporous layer are placed in a nitrogen-filled oven and sintered at 300°C for 30min to ob...

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Abstract

The invention belongs to the technical field of fuel cell materials, and particularly relates to a gas diffusion layer for a fuel cell and a preparation method thereof. The method provided by the invention comprises the following steps: respectively providing an electrostatic spinning solution containing a conductive material and an electrostatic spraying solution containing a water repellent; carrying out electrostatic spinning on a support body by using the electrostatic spinning solution, and carrying out electrostatic spraying on the support body by using the electrostatic spraying solution to obtain a prefabricated body; and carrying out heat treatment on the prefabricated body to obtain the gas diffusion layer for the fuel cell. The results of the embodiments demonstrate that the permeability coefficient of the gas diffusion layer prepared by the method is 1.356x10<-12>m<2> and is higher than that of the gas diffusion layer prepared by the traditional method, and the permeabilitycoefficient of the gas diffusion layer prepared by the traditional method is 1.290x10<-12>m<2>.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a gas diffusion layer for a fuel cell and a preparation method thereof. Background technique [0002] In a fuel cell, the gas diffusion layer (GDL) is located between the catalytic layer and the flow field, and its main function is to support the catalytic layer, collect current, and provide a transport channel for the reactant gas and product water. The drainage performance of the gas diffusion layer affects the diffusion of the reaction gas and the discharge of the product water, which in turn affects the performance of the fuel cell. Therefore, it is particularly important to prepare a diffusion layer with better drainage performance. A typical gas diffusion layer usually consists of a support and a microporous layer. The support is made of porous conductive media such as carbon paper or carbon cloth, and the microporous layer is generally made of condu...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/8605H01M4/8657H01M4/8807Y02E60/50
Inventor 于书淳周媛媛周佩张芳芳王莉
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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