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Gas diffusion layer for fuel cell as well as preparation method and application of gas diffusion layer

A gas diffusion layer, fuel cell technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve problems such as increased impedance and decreased durability, and achieves the goal of avoiding flooding, reducing workload, and avoiding proton conductivity decline. Effect

Active Publication Date: 2020-05-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to the previous patent, the use of polymer resin as a hydrophilic substance in this patent will also cause the problems of increased impedance and decreased durability

Method used

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  • Gas diffusion layer for fuel cell as well as preparation method and application of gas diffusion layer
  • Gas diffusion layer for fuel cell as well as preparation method and application of gas diffusion layer
  • Gas diffusion layer for fuel cell as well as preparation method and application of gas diffusion layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Hydrophobic treatment: use polytetrafluoroethylene as a hydrophobic agent to soak the support layer of the gas diffusion layer; prepare the microporous layer of the gas diffusion layer with a ratio of conductive carbon black and hydrophobic agent of 5:1.

[0044] Hydrophilic structure design: The selected small molecule is isopropyl tris(dioctyl pyrophosphate acyloxy) titanate, and the hydrophilic region is designed as image 3 Shown, the preparation method of hydrophilic region comprises the following steps:

[0045] a) using a mixed solution of deionized water and ethanol as a solvent, wherein the deionized water accounts for 5% of the mixed solution mass;

[0046] b) adjusting the pH value of the mixed solution to 6;

[0047] c) Put the small molecule used for self-assembly of the hydrophilic region into the above mixed solution, and stir for 20 minutes to obtain the precursor solution of the hydrophilic region, the mass proportion of the small molecule is 1%;

[00...

Embodiment 2

[0051] Hydrophobic treatment: use polytetrafluoroethylene as a hydrophobic agent to soak the support layer of the gas diffusion layer; prepare the microporous layer of the gas diffusion layer with a ratio of conductive carbon black to hydrophobic agent of 4:1.

[0052] Hydrophilic structure design: The selected small molecule is γ-glycidyloxypropyltrimethoxysilane, and the hydrophilic region is designed as image 3 Shown, the preparation method of hydrophilic region comprises the following steps:

[0053] a) using a mixed solution of deionized water and ethanol as a solvent, wherein deionized water accounts for 50% of the mixed solution mass;

[0054] b) adjusting the pH value of the mixed solution to 4;

[0055] c) Put the small molecule used for self-assembly of the hydrophilic region into the above mixed solution, and stir for 10 minutes to obtain the precursor solution of the hydrophilic region, the mass proportion of the small molecule is 2%;

[0056] d) Coating a hydro...

Embodiment 3

[0059] Hydrophobic treatment: use polyvinylidene fluoride as a hydrophobic agent to soak the support layer of the gas diffusion layer; prepare the microporous layer of the gas diffusion layer with a ratio of conductive carbon black to hydrophobic agent of 5:1.

[0060] Hydrophilic structure design: The selected small molecule is γ-methacryloxypropyltrimethoxysilane, and the hydrophilic region is designed as Figure 4 Shown, the preparation method of hydrophilic region comprises the following steps:

[0061] a) using a mixed solution of deionized water and ethanol as a solvent, wherein deionized water accounts for 30% of the mixed solution mass;

[0062] b) adjusting the pH value of the mixture to 2;

[0063] c) Put the small molecule used for self-assembly of the hydrophilic region into the above mixed solution, and stir for 30 minutes to obtain the precursor solution of the hydrophilic region, the mass proportion of the small molecule is 0.5%;

[0064] d) Coating a hydrophi...

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Abstract

The invention relates to a gas diffusion layer for a fuel cell as well as a preparation method and application of the gas diffusion layer. The gas diffusion layer is subjected to hydrophobic treatment, and then a hydrophilic region with a controllable shape is set on the gas diffusion layer. The hydrophilic region is of a hydrophilic membrane structure formed by self-assembly of hydrophilic smallmolecules in the gas diffusion layer, the thickness of the membrane structure depends on the diameter of the small molecules, and the hydrophilic capacity depends on the strength of hydrophilic groupscontained in the small molecules. The hydrophilic region passes through at least part of the thickness of the entire gas diffusion layer. The coordination structure of the hydrophilic and hydrophobicregions in the gas diffusion layer can be adjusted according to different working condition requirements, and the adjustment and control can meet the structural design of a plane and the structural design of the depth at the same time.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a gas diffusion layer for a fuel cell and a preparation method and application thereof. Background technique [0002] A fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. It has the advantages of high energy density, high utilization rate, clean and quiet, and is an efficient energy conversion device. Among them, the proton exchange membrane fuel cell is composed of a proton exchange membrane, a cathode and anode catalyst layer and a gas diffusion layer, and the gas diffusion layer can be further divided into a support layer and a microporous layer. Hydrogen is converted into protons and electrons under the action of the anode catalyst, the protons reach the cathode through the proton exchange membrane, and the electrons reach the cathode through the external circuit. After oxygen enters the cathode diffusion layer, it obtains electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/1004
CPCH01M4/86H01M4/8807H01M8/1004Y02E60/50
Inventor 林瑞陈亮唐圣濠董梦成
Owner TONGJI UNIV
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