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Method for preparing nitrogen-doped porous carbon material

A technology of nitrogen-doped porous carbon and carbon tetrachloride, which is applied in the field of inorganic nanomaterials and electrochemistry, can solve the problem that the capacitance of the material cannot meet expectations, and achieve excellent electrochemical capacitance performance, large pore volume, and microporous The effect of high content

Inactive Publication Date: 2008-11-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although activated carbon has a very large specific surface area, the capacitance of the material is not as expected.

Method used

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  • Method for preparing nitrogen-doped porous carbon material
  • Method for preparing nitrogen-doped porous carbon material
  • Method for preparing nitrogen-doped porous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 4.4g ethylenediamine, 10.8g carbon tetrachloride, and 1.0g mesoporous silica SBA-15 template were mixed, magnetically stirred for two hours, heated to 90°C, stirred and refluxed for 6 hours. The obtained sample was dried at 100°C, and then placed in a tube furnace. The temperature was raised to 600°C at a temperature increase rate of 5K / min under a nitrogen atmosphere, and the temperature was kept for 6 hours, then the sample was taken out. After removing the silicon template with 8% HF acid, it is washed with ethanol and water several times, and separated by filtration. Finally, it is dried in air at 100°C, and the product obtained is ordered mesoporous carbonitride, abbreviated as MCN-1. The prepared ordered mesoporous carbon-nitrogen material and potassium hydroxide are mixed in a mass ratio of 1:3, fully stirred and mixed in the aqueous solution, and dried, and then the sample is placed in a tube furnace, under Ar atmosphere The temperature is increased to 750°C at a ra...

Embodiment 2

[0029] The method of this embodiment is basically the same as that of embodiment 1, except that the mass ratio of the ordered mesoporous carbon nitrogen material to potassium hydroxide is 1:5, which is named MCN-1-AC5. Then characterize its morphology, texture characteristics and electrochemical capacitance performance (the electrolyte is 6mol / L KOH). image 3 This is a TEM picture of the porous carbon-nitrogen material obtained in this example. This structure also has a fairly rich distribution of micropores. Unlike the porous carbon-nitrogen material obtained in Example 1, the porous carbon-nitrogen structure obtained in this example has a certain mesopore distribution. Connect effectively. Similarly, 77K nitrogen adsorption and desorption experiments also obtained mesoporous structures with a distribution of 2-5nm.

[0030] The change in specific capacitance of the electrode material at different scan rates is reflected in figure 2 In the curve represented by MCN-1-AC5. The sp...

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Abstract

The invention relates to a method of preparing a nitrogen-doped porous carbon material, and belongs to the field of inorganic nanometer materials and electrochemistry. The inventive method comprises the steps of: preparing mesoporous carbon nitrogen compound with mesoporous silicon oxide powder and ethylene diamine as precursors, and activating with an activator potassium hydroxide at high temperature while controlling the mass ratio of the potassium hydroxide and the mesoporous carbon nitrogen material to obtain a nitrogenous material with high specific surface area and pore volume. The specific electric double layer capacitance of the inventive nitrogen-doped porous carbon material in alkaline aqueous electrolyte under potential scanning speed of 2mV / s is 328F / g and 318F / g, respectively, which are much higher than that of the reported porous carbon materials. The inventive nitrogen-doped porous carbon material has good application prospect as a high-power super capacitor active material.

Description

Technical field [0001] The invention relates to a preparation method of a nitrogen-doped porous carbon material, which belongs to the field of inorganic nano materials and electrochemistry. Background technique [0002] Supercapacitors, also called electrochemical capacitors, are a new type of energy storage element between batteries and traditional electrostatic capacitors. They have the characteristics of high specific capacity, high power, good cycle performance, long life, and wide operating temperature limits. Supercapacitors have higher power density than batteries and greater energy density than traditional capacitors. In recent years, with the increasing miniaturization of electronic and electrical equipment and the continuous development of the electric vehicle industry, supercapacitors as backup power sources and memory candidate devices have increasingly attracted widespread attention. [0003] Electrode materials are the key to the research of supercapacitors, and one...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/08
Inventor 高秋明姜金华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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