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Carbon nanofiber supported orderly-arranged reduced graphene oxide (RGO) electrode material

A carbon nanofiber and graphene electrode technology, which is applied in chemical instruments and methods, hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as poor order, low graphene packing density, and insufficient processing performance , to achieve the effects of preventing agglomeration, high polarizability, and improving charge accumulation ability

Active Publication Date: 2018-07-27
锦州凯美能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene in the graphene-based fibers obtained by the above two methods has problems such as low packing density, poor order and insufficient processing performance.

Method used

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  • Carbon nanofiber supported orderly-arranged reduced graphene oxide (RGO) electrode material
  • Carbon nanofiber supported orderly-arranged reduced graphene oxide (RGO) electrode material
  • Carbon nanofiber supported orderly-arranged reduced graphene oxide (RGO) electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of RGO-carbon nanofiber composite

[0042] process such as figure 1 As shown, the specific preparation steps are as follows:

[0043] (1), preparation of surface modified graphene oxide

[0044] Slowly add 10.0g of 5000 mesh natural flake graphite into a 2000mL large beaker filled with 200mL of concentrated sulfuric acid under stirring, keep the temperature at (0±1)℃, then slowly add the mixture of 4g of sodium nitrate and 20g of potassium permanganate , maintain (0 ± 1) ℃ under stirring, 2h to complete the reaction, in (35 ± 3) ℃ constant temperature water bath, keep stirring for 30min, slowly add 460mL of water, let the temperature rise to 98 ℃, at this temperature Maintain for 15 minutes; dilute to 1400mL with warm water, pour a certain amount of 0.5g H 2 o 2 , filtered while hot, fully washed the filter cake with 5wt% HCl until there was no SO in the filtrate 4 2- (with BaC1 2 solution detection), at 50°C at P 2 o 5 In the presence of ...

Embodiment 2

[0052] Example 2 Preparation of RGO-carbon nanofiber composite

[0053] (1), preparation of surface modified graphene oxide

[0054] Take 10.0g of 3000 mesh flake graphite as raw material, add 300.0mL of concentrated sulfuric acid, 5.0g of sodium nitrate, 30.0g of potassium permanganate and 0.5g of H 2 o 2 , using the improved Hummer method to prepare graphene oxide to obtain an aqueous graphene oxide solution with an O / C ratio of 0.3 to 0.5;

[0055] Take the graphene oxide aqueous solution and process it for 10 minutes under the action of ultrasonic waves with a frequency of 80 kHz and a power of 2.0 kW to obtain a graphene oxide solution with a graphene oxide sheet thickness of 10.0 nm to 30.0 nm and a sheet size of 0.1 μm to 2 μm;

[0056]The obtained graphene oxide solution is deacidified and deionized in deionized water using a semipermeable membrane, and the deionized water outside the semipermeable membrane is replaced every 2 hours until the pH of the solution outsi...

Embodiment 3

[0064] Example 3 Preparation of RGO-carbon nanofiber composites

[0065] (1), preparation of surface modified graphene oxide

[0066] Take 10.0g of 1000 mesh flake graphite as raw material, add 400mL of concentrated sulfuric acid, 6.0g of sodium nitrate, 40.0g of potassium permanganate and 0.5g of H 2 o 2 , using the improved Hummer method to prepare graphene oxide to obtain an aqueous graphene oxide solution with an O / C ratio of 0.3 to 0.5;

[0067] Take the graphene oxide aqueous solution and process it for 20 minutes under the action of ultrasonic waves with a frequency of 100 kHz and a power of 3.0 kW to obtain a graphene oxide dispersion solution with a graphene oxide sheet thickness of 10.0 nm to 30.0 nm and a sheet size of 0.1 μm to 2 μm;

[0068] The resulting graphene oxide dispersion solution is deacidified and deionized in deionized water using a semipermeable membrane, and the deionized water outside the semipermeable membrane is replaced every 2 hours until the ...

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Abstract

The invention discloses a preparation method of a carbon nanofiber supported orderly-arranged reduced graphene oxide (RGO) electrode material. The preparation method comprises the following steps: preparing graphene oxide from flake graphite by a Hummer method, performing surface modification on the graphene oxide by ionic liquid to obtain ionic liquid surface-modified graphene oxide, adding a polymer into a solvent, and stirred strongly under the action of ultrasonic waves to form an electrostatic spinning solution; and performing electrostatic spinning on the electrostatic spinning solution,and performing heat treatment on graphene oxide-polymer electrostatic spinning fibers obtained on an electrostatic spinning receiver to obtain a composite material in which RGO is arranged verticallyand orderly on the surfaces of the carbon nanofibers in an embedded manner. The preparation method has the advantages of reasonable process and stable performance, can prevent RGO agglomeration, increase the specific surface area and increase the charge storage density and charge transfer rate, is taken as an electrode of a high-capacity power supercapacitor, and can be up to 99.5 to 99.7 percentin charging and discharging efficiency.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and relates to a method for preparing carbon nanofiber-loaded embedded orderly vertically arranged reduced graphene oxide electrode materials. Background technique [0002] Reduced graphene oxide (RGO) is usually composed of several to dozens of layers of single-sheet graphene, which has the characteristics of open two-dimensional structure, high specific surface area and fast intralayer electron transport rate, making RGO as an electrode The material is extremely valuable in chemical power sources such as supercapacitors. However, the application of RGO as an electrode material has problems such as serious agglomeration, easy interlayer recombination, and difficulty in forming and processing. Using one-dimensional (1D) high-aspect-ratio nanowires to load two-dimensional (2D) RGO can form a three-dimensional (3D) network film structure, thereby preventing RGO agglomeration, increasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/32H01G11/36H01G11/40H01G11/84H01G11/86C01B32/198
CPCH01G11/24H01G11/26H01G11/32H01G11/36H01G11/40H01G11/84H01G11/86Y02E60/13
Inventor 何铁石付一然曾金贾瑞王云凤赵欣晔
Owner 锦州凯美能源有限公司
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