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Graphene paper and preparation method and application thereof

A technology of graphene paper and graphite paper, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of reducing specific surface area capacitance performance, difficulty in large-scale preparation of graphene electrodes, etc., and achieve excellent capacitance performance , low cost, simple operation

Active Publication Date: 2014-04-02
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current method usually takes place in aqueous solution. In the process of separating graphene, graphene sheets often reunite due to the strong van der Waals force between graphene sheets, thereby greatly reducing its ratio. Surface area and its capacitive properties
In addition, this method is difficult to prepare large graphene electrodes on a large scale.

Method used

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  • Graphene paper and preparation method and application thereof
  • Graphene paper and preparation method and application thereof
  • Graphene paper and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) First prepare the mixed oxidant. Mix 40 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid in an ice bath, and keep stirring until homogeneous. Then slowly add 6g of potassium permanganate to the mixed solution, and continue to stir evenly.

[0036] (2) Cut the graphite paper with a thickness of 1 mm into 4*4 cm and a mass of 1.5 g, and put it into the mixed oxidant. Stirring was stopped and the whole was left at room temperature for 2 hours. The oxidized graphite paper was taken out, washed successively with hydrogen peroxide, 3 mol / L hydrochloric acid solution, and distilled water until neutral, and then freeze-dried.

[0037] (3) The dried graphene oxide paper was placed in a tube furnace, and calcined at a high temperature for 1 hour under a nitrogen atmosphere, and the calcining temperature was controlled at 800°C.

[0038] (4) Performance test:

[0039] A, the prepared graphene paper has been carried out field emission scanning electron...

Embodiment 2~7

[0046] The preparation method of Examples 2-7 is different from that of Example 1 in the ratio of the mixed oxidant and the time and temperature of calcination. The proportioning of specific mixed oxidants, the time and temperature of calcination and the results of each embodiment are listed in Table 1 and Table 2.

[0047] Table 1. Oxidation regulation of graphite paper

[0048] Oxidant Sulfuric Amount Amount of oxidant nitric acid Potassium permanganate oxidation time Result description Specific surface area m 2 g -1 Conductivity Sm -1 Maximum specific capacitance mF cm -2 Example 2 35mL 10mL 5 g 2h The degree of graphene exfoliation is slightly lower 83 17 411 Example 3 45mL 15mL 7 g 2h Graphene has a high degree of peeling and is damaged 121 23 489 Example 4 35mL 15mL 6 g 2h The degree of graphene exfoliation is slightly lower 101 18 425 Example 5 45mL 10mL 6 g 2h Graphene has a hig...

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Abstract

The invention discloses graphene paper and a preparation method and application thereof. According to the preparation method disclosed by the invention, the preparation of the graphene paper is performed by taking conventional graphite paper as a basal body. The preparation method comprises the following specific steps: S1, performing oxidation stripping on the graphite paper by using a mixed oxidizing agent with strong oxidizing property, and then, cleaning and drying; S2, performing high-temperature calcination reduction on oxide graphene paper under an inert gas atmosphere to obtain the graphene paper. The preparation method is simple in process and low in cost, and suitable for large-scale volume industrial production. A paper form is kept by the prepared graphene paper, so that the graphene paper is very high in stripping degree, excellent in electrical conductivity and superhigh in specific surface area and very good in electrochemical capacitance performance. Compared with a traditional powder operation method, the preparation method is more convenient. The graphene paper product can be directly used as an electrode material of a supercapacitor, and is broad in application prospect in the energy storage aspect.

Description

technical field [0001] The invention belongs to the field of capacitor materials, in particular to a graphene paper and its preparation method and application. Background technique [0002] With the development of society and technology, the continuous development and utilization of various new energy sources requires the development of different types of energy storage devices to achieve efficient conversion and utilization of new energy sources. As a new, efficient and practical energy storage device between batteries and traditional capacitors, supercapacitors have many advantages, such as high power density, fast charge and discharge speed, long service life, environmental friendliness, operating temperature window width etc. At present, supercapacitors have been widely used in electronic equipment backup power supply, signal light power supply, and combined with fuel cells, lithium batteries and other power batteries as power supplies for electric vehicles, etc., and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/86
CPCY02E60/13
Inventor 卢锡洪于明浩童叶翔方萍萍
Owner SUN YAT SEN UNIV
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