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Method for preparing nitrogen-doped porous carbon by taking cottonseed hull as raw material and application

A nitrogen-doped porous carbon and cottonseed hull technology, applied in the field of nanomaterials, can solve the problems of low specific surface area of ​​porous carbon materials, unsuitable chemical composition, great differences in physical and chemical properties, etc., and achieves large pore volume and resource source range. Wide, energy-saving and consumption-reducing significant effect

Inactive Publication Date: 2018-08-28
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these methods, some raw materials have limited sources of resources, some chemical compositions are not suitable as raw materials for preparing nitrogen-doped porous carbon materials, and some have complex components, such as various plant straws (cellulose, hemicellulose, wood, etc.) The mixture of different components such as prime), the chemical structure and physical and chemical properties of each different component are very different, resulting in high requirements for the carbonization process using such raw materials, poor adaptability, and low yield. The specific surface area of ​​the prepared porous carbon material low, poor electrochemical performance

Method used

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  • Method for preparing nitrogen-doped porous carbon by taking cottonseed hull as raw material and application
  • Method for preparing nitrogen-doped porous carbon by taking cottonseed hull as raw material and application
  • Method for preparing nitrogen-doped porous carbon by taking cottonseed hull as raw material and application

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Experimental program
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Effect test

Embodiment 1

[0062] a. Pretreatment of cottonseed hulls: crush cottonseed hulls, put 4g of sodium hydroxide into the container as an evaporating dish, add 15mL of water and stir to dissolve, then add 4g of urea, stir to dissolve, at a temperature of 15°C Add 4g of pulverized cottonseed hulls and stir vigorously for 30 minutes to obtain a uniform sol, which is placed in a magnetic boat;

[0063] b. Preparation of nitrogen-doped porous carbon material: put the sol obtained in step a in a type furnace, first evacuate the tube type furnace, and then inject nitrogen gas for 5 minutes, raise the temperature to 800 °C at a rate of 5 °C / min, and keep it warm Carry out carbonization activation for 2 hours to obtain a black solid, which is then washed with water in sequence, washed with 10wt% hydrochloric acid until neutral, and dried at 120°C for 4 hours to obtain a specific surface area of ​​1010cm 3 / g, the pore volume is 0.6-0.9cm 3 / g, elemental analysis element content is: C: 66.3%, N: 2.07%,...

Embodiment 2

[0065] a. Pretreatment of cottonseed hulls: crush cottonseed hulls, put 8g of sodium hydroxide into a beaker, add 15mL of water and stir to dissolve, then add 12g of urea, stir to dissolve, at a temperature of 15°C Add 4g of pulverized cottonseed hulls and stir vigorously for 35 minutes to obtain a uniform sol, which is placed in a magnetic boat;

[0066] b. Preparation of nitrogen-doped porous carbon material: put the sol obtained in step a in a type furnace, first evacuate the tube type furnace, and then inject nitrogen gas for 5 minutes, and raise the temperature to 800 °C at a rate of 5 °C / min, and keep it warm Carry out carbonization activation for 2 hours to obtain a black solid, which is then washed with water in turn, washed with 10wt% hydrochloric acid until neutral, and dried at 120°C for 4 hours to obtain a specific surface area of ​​1650cm 3 / g, the pore volume is 0.9-1.12cm 3 / g, elemental analysis element content is: C: 65.8%, N: 5.2%, H: 1.59%; XPS surface anal...

Embodiment 3

[0068] a. Pretreatment of cottonseed hulls: crush the cottonseed hulls, put 8g of sodium hydroxide into a cylindrical container, add 15mL of water and stir to dissolve, then add 8g of urea, stir to dissolve, at a temperature of 25°C Add 6g of pulverized cottonseed hulls at the same time, and mechanically stir vigorously for 40min to obtain a uniform sol, which is placed in a magnetic boat;

[0069]b. Preparation of nitrogen-doped porous carbon material: put the sol obtained in step a in a type furnace, first evacuate the tube type furnace, and under the protection of nitrogen, raise the temperature to 800 °C at a rate of 5 °C / min, and keep it for 2 hours Carry out carbonization and activation to obtain a black solid, which is then washed with water in sequence, washed with 10wt% hydrochloric acid until neutral, and dried at 60°C for 8 hours to obtain a solid with a specific surface area of ​​2150 cm 3 / g, the pore volume is 1.23-1.36cm 3 / g, elemental analysis element content...

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Abstract

The invention discloses a method for preparing nitrogen-doped porous carbon by taking cottonseed hull as a raw material and application. The method is characterized in that the nitrogen-doped porous carbon material is prepared by taking the cottonseed hull as a raw material and urea as a nitrogen source, stirring and uniformly mixing the substances with a sodium hydroxide solution, and then carrying out high-temperature carbonization and activation. An electron microscope photo shows that the prepared nitrogen-doped porous carbon material is of a three-dimensional inner cross-linking network structure. XPS and elemental analysis show that the nitrogen element is successively and uniformly doped in a carbon matrix; the XPS analysis shows that the nitrogen content is 1.84 to 7.35%; the elemental analysis shows that the nitrogen content is 2.07 to 6.52 % and the specific surface area is 1010 to 2500m<2> / g. The super-capacitor experiment shows that the prepared nitrogen-doped porous carbonmaterial has good electrochemical properties and the specific capacitance can reach 320 to 340F / g (current density is 0.5A / g). The method has the advantages of simplicity in preparation, wide range of renewable resources as raw materials, low price, low cost, easiness in large-scale industrialization application and capability of being applied to the field of energy storage.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped porous carbon from cottonseed hulls, which belongs to the field of nanometer materials, and relates to a method for preparing nitrogen-doped porous carbon from cottonseed hulls and its application in the field of supercapacitors. Background technique [0002] Porous carbon materials are materials with carbon as the basic skeleton and structures of different sizes and shapes. This kind of material has a wide range of applications in the fields of catalysis, adsorption, sensing, separation and energy storage due to its specific developed pores, high specific surface area, excellent heat resistance, and adjustable pore size. However, pure carbon materials have fewer functional groups on the surface, so the high specific surface area of ​​carbon materials cannot be fully utilized. Nitrogen atoms are very similar to carbon atoms in structure. By adjusting the preparation process and replacing s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/05
Inventor 张亚刚姜莹芳艾克热木·牙生张乐涛陈玉荣王璐璐
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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