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Preparation method and application of graded porous carbon material

A technology of hierarchical porous and carbon materials, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of cumbersome preparation process, unfavorable industrial production, difficulty in large-scale preparation of porous carbon materials, etc., and achieve simplified preparation process, excellent electrochemical performance, conductive sex high effect

Inactive Publication Date: 2016-03-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of templates such as polymer opal and silica nanoparticles is cumbersome, and it is extremely difficult to prepare porous carbon materials on a large scale.
In addition, both chemical activation and template methods require cumbersome steps such as cleaning and drying of the product, which is very unfavorable for industrial production

Method used

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  • Preparation method and application of graded porous carbon material
  • Preparation method and application of graded porous carbon material
  • Preparation method and application of graded porous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weighing 810 mg of zinc oxide nanoparticles (first raw material) and 1.64 g of 2-methylimidazole (second raw material), ball milled at a speed of 200 rpm for 8 hours to obtain a carbon precursor material. Put the precursor material in N 2 Under the protection of inert gas, after holding at 200oC for 2h and then calcining at 950oC for 10h, a nitrogen-doped hierarchical porous carbon material was obtained.

[0026] attached figure 1 It is the XRD spectrum of the precursor material obtained in Example 1. The XRD pattern shows that the product after ball milling is a composite material of ZIF-8 and ZnO, indicating that part of ZnO is transformed into ZIF-8. And compared with the raw material, the intensity of the diffraction peak of zinc oxide in the precursor material is significantly weaker, and the half-peak width is increased, which further confirms that part of the zinc oxide is transformed into ZIF-8, thereby forming a core-shell structure.

[0027] attached figu...

Embodiment 2

[0031] Weigh 810mg of zinc oxide (the first raw material) and 0.41g of 2-methylimidazole (the second raw material), ball mill for 8 hours at a speed of 200 rpm, and then 2Under the protection of inert gas, heat preservation at 200oC for 2h and then calcining at 950oC for 10h, a hierarchically porous carbon material can be obtained, and the yield of hierarchically porous carbon is lower than that of Example 1.

Embodiment 3

[0033] Weigh 810mg of zinc oxide (the first raw material) and 13.12g of 2-methylimidazole (the second raw material), ball mill for 8 hours at a speed of 200 rpm, and then 2 Under the protection of inert gas, after holding at 200oC for 2h and then calcining at 950oC for 10h, a hierarchically porous carbon material can be obtained, and the yield of hierarchically porous carbon is higher than that of Example 1.

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Abstract

The invention discloses a preparation method of a graded porous carbon material. The preparation method comprises the following steps: sufficiently grinding a reaction raw material, obtaining a carbon precursor material having a core-shell structure by virtue of solid-phase reaction, carbonizing the carbon precursor material in one step at high temperature in an inert atmosphere, and removing a template to obtain the graded porous carbon material. The prepared graded porous carbon material is large in specific surface area and has an adjustable micropore-mesoporous graded porous structure; when being applied to the fields such as super-capacitors and lithium-sulfur batteries, the graded porous carbon material is excellent in electrochemical properties. The method is simple in process, environment-friendly and capable of realizing low-cost large-scale preparation of the graded porous carbon material.

Description

technical field [0001] The invention relates to the technical fields of nanomaterials and electrochemistry, in particular to a method for preparing a hierarchical porous carbon material. Background technique [0002] Hierarchical porous carbon materials have many advantages such as large specific surface area, hierarchical pore structure, excellent electronic conductivity, chemical stability, and thermal stability. When hierarchical porous carbon materials are applied to the electrodes of electrochemical energy storage devices, they can ensure the rapid transport of ions in the electrodes during charging and discharging, buffer the volume expansion of electrode materials, and inhibit the dissolution of active substances. Therefore, in supercapacitors, lithium-sulfur batteries, lithium The field of electrochemical energy storage devices such as ion batteries, lithium-air batteries, and fuel cells has important application value and has received extensive attention. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 张校刚丁兵王婕常智
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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