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Pyridine nitrogen-enriched ultrathin carbon nanosheet material and preparation method thereof

A carbon nanosheet, pyridine nitrogen technology, applied in nanocarbon, nanotechnology, nanotechnology and other directions, to achieve the effect of overcoming poor conductivity, high stability and high capacitance value

Active Publication Date: 2020-02-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, the effect of nitrogen doping on the performance of carbon materials used in supercapacitors is only a preliminary discussion, and further research and exploration are needed.

Method used

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  • Pyridine nitrogen-enriched ultrathin carbon nanosheet material and preparation method thereof
  • Pyridine nitrogen-enriched ultrathin carbon nanosheet material and preparation method thereof
  • Pyridine nitrogen-enriched ultrathin carbon nanosheet material and preparation method thereof

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Effect test

Embodiment 1

[0053] A preparation method of pyridine nitrogen enriched ultra-thin carbon nanosheet material, the method comprising the following steps:

[0054] (1) Mixing of raw materials: 19g, 0.8g, 19g, 0.8g, After mixing 0.1g and 0.1g, add 40mL of deionized water to dissolve, stir and mix evenly under the condition of heating in a water bath, and place in an oven for 40-48 hours to obtain a light yellow solid mixture;

[0055] (2) Pyrolysis reaction: Grind the light yellow solid mixture obtained in step (1) into a uniform powder, react in a tube furnace, use nitrogen as a protective gas, and start from room temperature (25 ° C) at 5 ° C / The temperature was raised to 600 °C at a rate of 1 min and kept for 1 h, and then raised to 700 °C at a rate of 5 °C / min and kept for 1 h to obtain a black powdery solid that is a nanosheet material enriched with pyridine nitrogen. figure 1 It is a scanning electron micrograph of the ultra-thin pyridine nitrogen-rich nanosheet material prepared in t...

Embodiment 2

[0058] A preparation method of pyridine nitrogen enriched ultra-thin carbon nanosheet material, the method comprising the following steps:

[0059] (1) Mixing of raw materials: Melamine, GAH (D-glucosamine hydrochloride) 2-methylimidazole and pyromellitic anhydride were mixed with 10g, 0.8g, After mixing 0.1g and 0.1g, add 40mL of deionized water to dissolve, stir and mix evenly under the condition of heating in a water bath, and dry in an oven for about 48 hours to obtain a light yellow solid mixture.

[0060] (2) Pyrolysis reaction: Grind the solid mixture into a fine and uniform powder, react in a tube furnace, use nitrogen as a protective gas, and raise the temperature from room temperature to 600°C at a rate of 5°C / min and keep it for 1h. Then the temperature was raised to 700° C. at a rate of 5° C. / min and kept for 1 h to obtain a black powdery solid that was an ultrathin pyridine nitrogen-enriched nanosheet material. Figure 7 The scanning electron micrograph of the ul...

Embodiment 3

[0063] A preparation method of pyridine nitrogen enriched ultra-thin carbon nanosheet material, the method comprising the following steps:

[0064] (1) Mixing of raw materials: Melamine, GAH (D-glucosamine hydrochloride) 2-methylimidazole and pyromellitic anhydride were mixed with the above reactants 40, 0.8g, After mixing 0.1g and 0.1g, add 40mL of deionized water to dissolve, stir and mix evenly under the condition of heating in a water bath, and dry in an oven for about 48 hours to obtain a light yellow solid mixture.

[0065] (2) Pyrolysis reaction: Grind the solid mixture into a fine and uniform powder, react in a tube furnace, use nitrogen as a protective gas, and raise the temperature from room temperature to 600°C at a rate of 5°C / min and keep it for 1h. Then the temperature was raised to 700° C. at a rate of 5° C. / min and kept for 1 h to obtain a black powdery solid that was an ultrathin pyridine nitrogen-enriched nanosheet material. Figure 8 The scanning electron m...

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Abstract

The invention discloses preparation methods and applications of a pyridine nitrogen enriched ultrathin carbon nanosheet material and metal composite of the pyridine nitrogen enriched ultrathin carbonnanosheet material. Specifically, a nitrogen source and a carbon source are mixed, the mixture reacts under a high-temperature condition, and solid phase mixing is adopted. The nitrogen source can bemelamine, dicyandiamide, cyanamide or urea and the like, and the carbon source can be D-GAH (glucosamine hydrochloride), glucose or 2-methylimidazole and the like. The obtained nitrogen-doped carbon nanosheet material and the metal composite thereof have the characteristics of high nitrogen doping levels and size graded porous combined structures in composition and structure, have higher specificcapacitance, better chemical stability and thermal stability, higher cycle stability and more ideal conductivity and the like. The composite electrode is tested as a working electrode material of a supercapacitor and still has higher specific capacitance, better rate performance and cycle stability under the condition of large current density.

Description

technical field [0001] The invention relates to the field of nano-carbon composite materials, in particular to a method for preparing pyridine nitrogen-enriched ultra-thin carbon nanosheets and metal composite materials. Background technique [0002] Due to the continuous consumption of traditional fossil energy and the increasing global demand for energy, the problem of energy shortage is imminent. Therefore, electrochemical researchers have expended considerable efforts to develop advanced energy conversion and storage devices. Among various energy storage device systems, supercapacitors with high energy density are considered to be very promising energy storage devices that can meet human production needs. Traditional supercapacitors can be divided into two types according to the mechanism of storing electric energy. One is "electric double layer capacitor", the charge separation phenomenon on the electrode / electrolyte will produce electric double layer capacitance, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15B22F9/24B82Y30/00B82Y40/00H01G11/30H01G11/36H01G11/44
CPCB22F9/24B82Y30/00B82Y40/00C01B32/15H01G11/30H01G11/36H01G11/44Y02E60/13
Inventor 李涛周岩松赵帅郭文
Owner HUAZHONG UNIV OF SCI & TECH
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