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Preparation method of tubular graphene with high electrochemical and capacitive property

An electrochemical and graphene technology, applied in the field of electrochemical energy storage, can solve the problems of low hydrophilicity, difficult to show capacitance performance, low capacitance, etc., and achieve the effect of high energy density

Inactive Publication Date: 2012-09-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]However, in practice, both materials have their own limitations
Graphene often agglomerates or re-stacks due to the van der Waals force, which makes it difficult to demonstrate its capacitive performance; carbon nanotubes often show low capacitance due to the difficulty of electrolyte ions to penetrate into the inner side of the tube wall and low hydrophilicity. Capacitance, especially for multi-walled carbon nanotubes

Method used

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  • Preparation method of tubular graphene with high electrochemical and capacitive property
  • Preparation method of tubular graphene with high electrochemical and capacitive property
  • Preparation method of tubular graphene with high electrochemical and capacitive property

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Embodiment 1

[0025] Example 1: The graphitized material can be exfoliated by oxidation by a strong oxidant. The Hummers method has been able to oxidize graphite, and then disperse and reduce it through ultrasonics to prepare two-dimensional graphene. figure 1 As shown, the present invention uses the same method to oxidize multi-walled carbon nanotubes and passes through NaBH 4 Reduction not only cuts the carbon nanotubes in the transverse direction, such as figure 2 , 3, and can be opened longitudinally, such as Figure 4 , As shown in 5, a tubular graphene sheet is formed.

[0026] The above-mentioned multi-walled carbon nanotubes and tubular graphene sheets were subjected to nitrogen adsorption and desorption experiments. Such as Image 6 As shown, the specific surface areas of multi-walled carbon nanotubes and tubular graphene sheets are 47 cm, respectively 2 g -1 And 89 cm 2 g -1 The increase in specific surface area indicates that the multi-walled carbon nanotubes were successfully cut...

Embodiment 2

[0030] Example 2: Hummers method oxidizes multi-walled carbon nanotubes, keeps the amount of multi-walled carbon nanotubes, sodium nitrate, and concentrated sulfuric acid unchanged, doubles the amount of oxidant potassium permanganate, centrifugal washing, vacuum drying; Such as Figure 5 The same result is that it is cut off in the horizontal direction and opened in the vertical direction. Electrochemical tests show that there is no change in capacitance performance. It shows that the method adopted in this patent is simple and easy to implement, and is suitable for mass production.

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Abstract

The invention relates to a preparation method of tubular graphene with high electrochemical and capacitive property. According to the invention, a Hummers method is used for simultaneously cutting a multi-wall carbon nano tube along a vertical direction and a transverse direction, so as to form a tubular graphene sheet. The tubular graphene is in a hybrid structure of a one-dimensional carbon nano tube and two-dimensional graphene. The result of an electrochemical property test shows that compared with the multi-wall carbon nano tube, the tubular graphene has the advantage of higher electrochemical and capacitive property.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a preparation method of tubular graphene with high electrochemical capacitance performance. Background technique [0002] Supercapacitor is a new type of energy storage device that has emerged in recent years. Compared with various energy storage devices widely used at present, its charge storage capacity is much higher than that of physical capacitors, and its charge and discharge speed and efficiency are superior to secondary batteries. In addition, supercapacitors also have the characteristics of no pollution to the environment, long cycle life, wide operating temperature range, and high safety performance, so they occupy an increasingly important position in new energy technologies (Chinese SciBull, 2011, 56: 2092? 2097). Carbon nanotubes and graphene are new carbon materials that have attracted much attention in recent years, and have been applied in...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y40/00C01B32/184
Inventor 王雪峰王欢文王雅兰
Owner TONGJI UNIV