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Preparation method for three-dimensional reticular nitrogen-doped graphene composite cobalt hydroxide hexagonal nano-sheet electrode material

A technology of nitrogen-doped graphene and three-dimensional network, which is applied in the field of preparation of supercapacitor electrode materials, can solve the problem of specific surface area reduction and achieve the effect of ensuring specific surface area, good industrial application prospects, experimental conditions and simple preparation process

Inactive Publication Date: 2015-12-02
NANJING UNIV
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  • Application Information

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Problems solved by technology

However, the graphene reported so far is mainly two-dimensional monolithic, and the graphene in the composite is easy to stack, and the specific surface area is greatly reduced.

Method used

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  • Preparation method for three-dimensional reticular nitrogen-doped graphene composite cobalt hydroxide hexagonal nano-sheet electrode material
  • Preparation method for three-dimensional reticular nitrogen-doped graphene composite cobalt hydroxide hexagonal nano-sheet electrode material
  • Preparation method for three-dimensional reticular nitrogen-doped graphene composite cobalt hydroxide hexagonal nano-sheet electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Under vigorous stirring conditions, 1.0g of cobalt chloride hydrate, 5.9g of sodium citrate and 2.1g of hydrated sodium dihydrogen phosphate were dissolved in 100ml of deionized water in turn, and the latter was added after the former reactant was completely dissolved. , the concentrations of the three are 0.04M, 0.2M and 0.15M respectively; add 8.0g of sodium hydroxide in a water bath at 50°C, the final concentration of sodium hydroxide is 2.0M, and then continue to stir for 30min; take another 100ml of deionized water, Add 0.2g of graphite oxide powder, and ultrasonicate for 1.0h at 100W power to obtain a 2.0mg / ml graphene oxide suspension; mix the mixed solution and the graphene oxide suspension at a volume ratio of 1:3 to form a 40ml reaction solution, and add 500 μl of ethyl alcohol Diamine, magnetically stirred and reacted for 15 minutes; the reaction solution was transferred into a 50ml reaction kettle, reacted at 180°C for 12 hours, and cooled naturally; finally,...

Embodiment 2

[0037] The volume ratio of the mixed solution and the graphene oxide solution was changed to 1:0.5, and other conditions were the same as in Example 1.

Embodiment 3

[0039] The volume ratio of the mixed solution and the graphene oxide solution was changed to 1:5, and other conditions were the same as in Example 1.

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Abstract

The invention discloses a preparation method for a three-dimensional reticular nitrogen-doped graphene composite cobalt hydroxide hexagonal nano-sheet electrode material. In order to overcome the problem that the pseudocapacitance material is poor in electrical conductivity and low in specific surface area, the simple and economical one-step hydrothermal route is conducted. During the formation process of three-dimensional reticular nitrogen-doped graphene, the graphene three-dimensional network skeleton-supported Co(OH)2 composite electrode material is prepared through the in-situ growth of Co(OH)2 hexagonal nano-sheets. Each edge of one hexagonal nano-sheet is about 100-300 nm, and the thickness of the hexagonal nano-sheet is 10-15 nm. The material is good in capacitive performance, wherein the capacitive value of the material is 740.4F / g at the scanning speed of 5mV / s and is up to 952.4F / g at the current density of 1.0A / g. therefore, the method has a considerable advantage in preparing electrode materials for super capacitors.

Description

technical field [0001] The invention relates to a preparation method of a supercapacitor electrode material, which is characterized in that Co(OH) is grown in situ during the formation of three-dimensional network nitrogen-doped graphene by a one-step hydrothermal method 2 Hexagonal nanosheets to obtain graphene three-dimensional network framework supporting Co(OH) 2 composite electrode materials. Background technique [0002] With the continuous consumption of non-renewable energy such as petroleum and coal and the continuous enhancement of people's awareness of environmental protection, the application of green and clean energy and the improvement of the ecological environment have attracted more and more attention. Supercapacitors have attracted close attention from academia and industry because of their high power density and long cycle life. Compared with traditional secondary battery storage devices, supercapacitors have many advantages. For example, the specific pow...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36
Inventor 唐少春谢浩孟祥康
Owner NANJING UNIV
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