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Nitrogen-doped graphene hydrogel, preparation method and applications thereof

A nitrogen-doped graphene and hydrogel technology is applied in the field of graphene to achieve the effects of simple synthesis and regulation, no pollution, and low cost

Inactive Publication Date: 2013-01-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, methods such as chemical vapor deposition, high-temperature ammonia gas treatment, and plasma treatment have been used to synthesize nitrogen-doped graphene, but these methods require large-scale equipment or extreme synthesis conditions, and simple methods are developed to prepare nitrogen-doped graphene still challenging work

Method used

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  • Nitrogen-doped graphene hydrogel, preparation method and applications thereof
  • Nitrogen-doped graphene hydrogel, preparation method and applications thereof
  • Nitrogen-doped graphene hydrogel, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Graphene oxide was chemically synthesized by the Hummars method, and graphite oxide was added to water for ultrasonic dispersion to obtain a graphene oxide aqueous solution with a concentration of 2.7 mg / mL; 30.0 μL ethylenediamine was slowly added dropwise to 17 mL of graphene oxide aqueous solution, and The speed of diamine dripping is 50uL / min, after stirring for 15 minutes, put into the reaction kettle of 23mL and carry out reaction, and hydrothermal reaction temperature is 200 ℃, time 12h. The product was washed with water. Photos of the obtained product are attached figure 1 shown. From attached figure 1 It can be seen that the product has certain mechanical properties. figure 2 SEM photographs of the obtained product. image 3 According to the photoelectron spectrum (N1s) of the obtained product, it can be seen that pyridinic and pyrrole nitrogen exist in the product. Figure 6 It is the charge-discharge performance that the obtained product has as the supe...

Embodiment 2

[0040] Graphene oxide was chemically synthesized by the Hummars method, and graphite oxide was added to water for ultrasonic dispersion to obtain a graphene oxide aqueous solution of 2.0 mg / mL; 2.5 μL of ethylenediamine was slowly added dropwise to 17 mL of graphene oxide aqueous solution, and ethylenediamine was dropped The speed of adding is 100uL / min, after stirring for 15 minutes, put it into a 23mL reactor for reaction, the hydrothermal reaction temperature is 200°C, and the time is 10h. The product was washed with water, and the results are shown in Table 1.

Embodiment 3

[0042] Graphene oxide was chemically synthesized by the Hummars method, and graphite oxide was added to water for ultrasonic dispersion to obtain a graphene oxide aqueous solution of 2.7 mg / mL; 5.0 μL of ethylenediamine was slowly added dropwise to 17 mL of graphene oxide aqueous solution, and ethylenediamine was dropped The speed of adding is 250uL / min, after stirring for 15 minutes, put it into a 23mL reactor for reaction, the hydrothermal reaction temperature is 200°C, and the time is 12h. The product was washed with water, and the results are shown in Table 1.

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Abstract

The present invention provides a preparation method for a nitrogen-doped graphene hydrogel. The preparation method comprises the following steps: (1) adding an oxidized graphite to water according to a certain ratio, and carrying out ultrasonic dispersion to obtain an oxidized graphene aqueous solution; (2) adding an organic amine to the oxidized graphene aqueous solution obtained from the step (1) in a dropwise manner, and stirring for a certain time to form an oxidized graphene and organic amine compounded intermediate product; and (3) carrying out a hydrothermal synthesis reaction on the intermediate product obtained from the step (2) to obtain the nitrogen-doped graphene hydrogel. The method of the present invention is a new and easy method for synthesis and regulation of the three dimensional structure of the graphene, and has characteristics of simple operation, easy control, low cost, no pollution and easy industrialization. With application of the graphene hydrogel of the present invention as a super-capacitor electrode material, results show that good specific capacitance and high power density are provided under the very high charge and discharge current circumstance.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a nitrogen-doped graphene hydrogel and its hydrothermal synthesis and regulation method and application. Background technique [0002] Supercapacitor is a new type of energy storage device developed in the 1970s and 1980s. It is a power source with special properties between traditional capacitors and batteries. The outstanding advantages of supercapacitors are high power density, short charge and discharge time, long cycle life, and wide operating temperature range. Improving the energy density and power density of supercapacitors has always been the pursuit of human beings. [0003] Graphene is a new material with a single-layer sheet structure composed of carbon atoms, and its appearance has caused a research boom all over the world. It is the thinnest known material, the material is very strong and hard, and at room temperature, it can transfer electrons faste...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01G9/042C01B32/184
CPCY02E60/13
Inventor 俞书宏陈平杨晶晶王政肖天元李姗姗
Owner UNIV OF SCI & TECH OF CHINA
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