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Method for preparing nitrogen-doped porous carbon material

A nitrogen-doped porous carbon and carbon tetrachloride technology is applied in the fields of inorganic nanomaterials and electrochemistry, which can solve the problems such as the unsatisfactory capacitance of the material, and achieve the effects of maintaining stability, uniform distribution and high specific surface area.

Inactive Publication Date: 2011-08-03
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • 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 of ethylenediamine, 10.8g of carbon tetrachloride, and 1.0g of mesoporous silica SBA-15 template were mixed, magnetically stirred for two hours, heated to 90°C, and stirred and refluxed for 6h. The obtained samples were first dried at 100°C, and then placed in a tube furnace, heated to 600°C at a heating rate of 5K / min under a nitrogen atmosphere, kept for 6 hours, and then cooled to take out the samples. After removing the silicon template with 8% HF acid, it was washed several times with ethanol and water, and separated by filtration. Finally, it is dried in air at 100°C, and the obtained product is ordered mesoporous carbonitride, abbreviated as MCN-1. The prepared ordered mesoporous carbon-nitrogen material is mixed with potassium hydroxide in a mass ratio of 1:3, fully stirred and mixed in an aqueous solution, and after drying, the sample is placed in a tube furnace and heated under an Ar atmosphere to The temperature was raised to 750°C at a rate of 10K / min,...

Embodiment 2

[0029] The method of this example is basically the same as that of Example 1, except that the mass ratio of the ordered mesoporous carbon-nitrogen material to potassium hydroxide is 1:5, and it is named MCN-1-AC5. Then characterize its morphology, texture characteristics and electrochemical capacitive performance (the electrolyte is 6mol / L KOH). image 3 It is a TEM photo of the porous carbon-nitrogen material obtained in this example. This structure has quite abundant micropore distribution equally, what is different from the porous carbon-nitrogen material that embodiment 1 obtains is, there is certain mesopore distribution in the porous carbon-nitrogen structure that this embodiment obtains, and they make these micropores effectively connect. Similarly, the 77K nitrogen adsorption and desorption experiments also obtained mesoporous structures distributed in the range of 2-5nm.

[0030] The change of the specific capacitance of the electrode material at different scan rate...

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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 nanometer materials and electrochemistry. Background technique [0002] Supercapacitors, also known as 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 limit. Supercapacitors have higher power density than batteries and greater energy density than traditional capacitors. In recent years, with the miniaturization of electronic and electrical equipment and the continuous development of the electric vehicle industry, supercapacitors as backup power and memory backup devices have increasingly attracted people's attention. [0003] Electrode materials are the key to supercapacitor research, and one of the research hot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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