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Three-dimensional graphene frame material, microporous layer, gas diffusion layer and preparation method thereof

A frame material, graphene technology, applied in fuel cells, electrical components, structural parts, etc., can solve the problem of insufficient cathode water return performance of materials, achieve water management and performance improvement, and achieve high-speed conduction and high conductivity. and hydrophobic properties

Pending Publication Date: 2022-05-13
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a three-dimensional graphene frame material, a microporous layer, a gas diffusion layer and its Preparation

Method used

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  • Three-dimensional graphene frame material, microporous layer, gas diffusion layer and preparation method thereof
  • Three-dimensional graphene frame material, microporous layer, gas diffusion layer and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0088] A kind of composite microporous layer containing 3DGF, its preparation method is as follows:

[0089] 1. Under an ice-water bath, first pour 20g of concentrated sulfuric acid solution into a reaction bottle containing 1g of graphite powder, add 2g of potassium permanganate solid, mix well; stir and react at 15°C for 20min; heat up to 35°C and continue Stir and react for 30 minutes; slowly add 10 g of deionized water, and continue to stir and react for 20 minutes; add 15 g of hydrogen peroxide for reduction reaction to reduce the unreacted oxidant, making the solution bright yellow. Filtrate while hot, wash with HCl and deionized water until the filtrate is free of sulfate ions, and finally configure a graphene oxide (GO) aqueous solution with a certain mass concentration (0.1-2mg / mL).

[0090] 2. Take 50 mL of the graphene oxide aqueous solution (1 mg / mL) prepared in the previous step, add 200 mg of vitamin C, and carry out a cross-linking reaction at 40 ° C for 12 hour...

Embodiment 2

[0098] A kind of composite microporous layer containing 3DGF, its preparation method is as follows:

[0099] 1. the preparation method of graphene oxide aqueous solution is as described in embodiment 1;

[0100] 2. Use ethylene glycol to carry out cross-linking, and other conditions are as above-mentioned embodiment 1, obtain GO gel;

[0101] 3. The GO gel was quickly frozen under liquid nitrogen, and then placed in a freeze dryer for freeze-drying;

[0102] 4. Carry out high-temperature heat treatment, the experimental conditions are identical with embodiment 1, obtain three-dimensional graphene framework powder material 3DGF-2;

[0103] Steps 5-8 were all as described in Example 1 to obtain the microporous layer prepared by 3DGF-2 and the assembled fuel cell, and perform performance tests.

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Abstract

The invention discloses a three-dimensional graphene frame material, a microporous layer, a gas diffusion layer and a preparation method thereof. The preparation method of the three-dimensional graphene framework material comprises the following steps: (1) in the presence of a solvent, carrying out cross-linking reaction on graphene oxide and a reducing agent to obtain graphene oxide gel; (2) carrying out freeze drying on the graphene oxide gel to obtain a three-dimensional graphene oxide nanosheet; (3) carrying out heat treatment on the three-dimensional graphene oxide nanosheet to obtain a three-dimensional graphene nanosheet framework material; wherein the heat treatment comprises the following steps: heating to 700-900 DEG C at a heating rate of 3-6 DEG C / min, and keeping the temperature for 2-6 hours. The three-dimensional graphene framework material has an ultra-large specific surface area and porosity, and has high conductivity and hydrophobic property. The invention also constructs a high-performance microporous layer and a gas diffusion layer based on the three-dimensional graphene frame, and the water management and performance improvement effects on the fuel cell are obvious.

Description

technical field [0001] The invention relates to a three-dimensional graphene frame material, a microporous layer, a gas diffusion layer and a preparation method thereof. Background technique [0002] Cathode water management plays an important role in proton exchange membrane fuel cells (PEMFC). A large amount of water is usually produced on the cathode side, especially in the case of high current discharge, if the produced water cannot be discharged in time, it will hinder the oxygen transmission, thereby reducing the density of the three-phase reaction interface, and the performance of the fuel cell will be attenuated. The gas diffusion layer (GDL) is located between the flow field and the catalytic layer, and usually plays a certain role in gas conduction and drainage, and plays an important role in PEMFC water management. [0003] Usually GDL includes a support layer and a microporous layer (MPL). The microporous layer is mainly composed of conductive carbon black (Vulc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/0234H01M8/0245H01M8/0273
CPCH01M8/0234H01M8/0245H01M8/0273H01M4/8807
Inventor 朱星烨詹吟桥闫海杨敏
Owner SHANGHAI ELECTRICGROUP CORP
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