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Three-dimensional functionalized graphene for supercapacitors and preparation method of three-dimensional functionalized graphene

A supercapacitor and functionalized technology, which is applied in the field of three-dimensional functionalized graphene for supercapacitors and its preparation, can solve the problems of poor contact, prone to reaggregation, and the specific capacitance density value limits the application of graphene electrodes. Polymerization, the effect of high cycle stability

Inactive Publication Date: 2015-01-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, two-dimensional sheet graphene usually has poor contact with the electrolyte and strong van der Waals force between sheets, which is prone to reunion, resulting in a specific capacitance density of graphene electrodes in water bases of 135F / g (November 2011 1st edition, Zhu Hongwei, "Graphene-Structure, Preparation Method and Characterization", p. 159)
Low specific capacitance density values ​​greatly limit the application of graphene electrodes in supercapacitors

Method used

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  • Three-dimensional functionalized graphene for supercapacitors and preparation method of three-dimensional functionalized graphene
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  • Three-dimensional functionalized graphene for supercapacitors and preparation method of three-dimensional functionalized graphene

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Experimental program
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Effect test

Embodiment 1

[0058] Preparation of FG-300 three-dimensional functionalized graphene

[0059] Step 1: Making Graphite Oxide

[0060] (A) under 0 DEG C of ice-bath conditions, adding graphite powder and oxidizing agent is in the sulfuric acid of 98% in percent concentration, after mixing 30min under stirring velocity at 800r / min, obtains mixture; Described oxidizing agent is potassium permanganate and sodium nitrate;

[0061] Dosage: 50g of potassium permanganate, 10g of sodium nitrate, and 500ml of sulfuric acid are needed in 10g of graphite powder.

[0062] In the present invention, the particle size of the selected graphite powder should be less than 300 mesh.

[0063] (B) The mixture was stirred and reacted for 180 minutes at a stirring speed of 800 r / min in a water bath at 35° C., diluted with deionized water, and reacted for 15 minutes at a temperature of 95° C. to obtain the first suspension;

[0064] Add 1000ml of deionized water to 500ml of sulfuric acid;

[0065] In the present...

Embodiment 2

[0096] Preparation of FG-200 three-dimensional functionalized graphene

[0097] Step 1: Making Graphite Oxide

[0098] (A) under 4 ℃ of ice-bath conditions, adding graphite powder and oxidizing agent is in the sulfuric acid of 98% in percentage concentration, after mixing 20min under stirring speed at 1500r / min, obtains mixture; Described oxidizing agent can be potassium permanganate and sodium nitrate.

[0099] Dosage: 40g of potassium permanganate, 5g of sodium nitrate, and 400ml of sulfuric acid are needed in 10g of graphite powder.

[0100] In the present invention, the particle size of the selected graphite powder should be less than 300 mesh.

[0101] (B) The mixture was stirred and reacted for 120 minutes at a stirring speed of 1000 r / min in a water bath at 22° C., diluted with deionized water, and reacted at 90° C. for 10 minutes to obtain the first suspension;

[0102] Add 800ml of deionized water to 400ml of sulfuric acid;

[0103] (C) adding hydrogen peroxide wi...

Embodiment 3

[0113] Preparation of FG-500 three-dimensional functionalized graphene

[0114] Step 1: Making Graphite Oxide

[0115] (A) Under the condition of ice bath at 1° C., graphite powder and oxidizing agent are added in the sulfuric acid with a percentage concentration of 98%, and after mixing for 25 min at a stirring speed of 1200 r / min, the mixture is obtained; the oxidizing agent can be potassium permanganate and sodium nitrate.

[0116] Dosage: 30g of potassium permanganate, 15g of sodium nitrate, and 300ml of sulfuric acid are needed in 10g of graphite powder.

[0117] In the present invention, the particle size of the selected graphite powder should be less than 300 mesh.

[0118] (B) The mixture was stirred and reacted for 200 min at a stirring speed of 1200 r / min in a water bath at 30° C., diluted with deionized water, and reacted at 3° C. for 10 min to obtain the first suspension;

[0119] Add 700ml of deionized water to 300ml of sulfuric acid;

[0120] (C) adding hydro...

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Abstract

The invention discloses three-dimensional functionalized graphene for supercapacitors and a preparation method of the three-dimensional functionalized graphene. Natural graphite powder is used as a raw material for preparing graphite oxide, hydrochloric acid assists in ultrasonic stripping so that oxidized graphene can be prepared, and the three-dimensional functionalized graphene is obtained through controllable thermal reduction. The three-dimensional functionalized graphene prepared through the method is of a controllable multistage mutual through hole structure and has functionalized surface functional groups. The three-dimensional functionalized graphene is made into electrodes suitable for the supercapacitors, the specific capacitance value of the electrodes in a water-based electrolytic solution reaches 508 F / g, energy densities of the supercapacitors are 15 Wh / kg and 66 Wh / kg, and corresponding power densities of the supercapacitors are 14 kW / kg and 52 kW / kg in a water-based electrolytic solution system and an ionic liquid-based electrolytic solution system. When the power density of the ionic liquid-based electrolytic solution system is 128 kW / kg, the corresponding energy density still keeps 56 Wh / kg accounting for 85% that of an initial value.

Description

technical field [0001] The invention relates to the preparation of a graphene nano-energy material, more particularly, to a three-dimensional functionalized graphene for a supercapacitor and a preparation method thereof. Background technique [0002] In recent years, with the aggravation of environmental pollution and the depletion of fossil fuels, renewable energy storage systems with the advantages of environmental friendliness, high efficiency, and low consumption have attracted more and more attention. Among these renewable energy storage systems, supercapacitors are widely used in portable electronic devices, hybrid electric vehicles, etc. due to their advantages of high power, good cycle stability, and low operating cost. Supercapacitors, also known as electrochemical capacitors (ECs), are a new class of energy storage devices based on electrode materials such as high specific surface area carbon materials, metal oxides, and conductive polymers. However, low energy de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/86H01G11/84
CPCY02E60/13H01G11/24H01G11/84H01G11/86
Inventor 高秋明田维乾
Owner BEIHANG UNIV
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