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Mono-dispersed nitrogen doped hollow carbon nano polyhedron and preparation method thereof

A nitrogen-doped, monodisperse technology, applied in the direction of nano-carbon, can solve the problems of inability to directly prepare hollow-structure carbon nanomaterials, and achieve the effect of maintaining polyhedral morphology, uniform nitrogen doping, and environmentally friendly preparation processes

Inactive Publication Date: 2017-03-15
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has obvious disadvantages: stepwise carbonization
This method cannot realize the one-step direct preparation of hollow structure carbon nanomaterials

Method used

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  • Mono-dispersed nitrogen doped hollow carbon nano polyhedron and preparation method thereof
  • Mono-dispersed nitrogen doped hollow carbon nano polyhedron and preparation method thereof
  • Mono-dispersed nitrogen doped hollow carbon nano polyhedron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of ZnO nanospheres

[0034] Add 40mL of 0.1mol / L zinc acetate aqueous solution and 200mL of 0.1mol / L triethanolamine aqueous solution into a 250mL Erlenmeyer flask, stir at room temperature for 30min, and then irradiate it in a water bath at 20℃ ultrasonically for 20min. Set 12h. ZnO nanospheres are obtained by centrifugal collection, washing, and vacuum drying.

[0035] (2) Preparation of ZnO@ZIF-8 precursor with core-shell structure

[0036] Add 40.0mg of ZnO nanospheres obtained in step 1) into a 40ml glass bottle containing a mixed solvent of DMF and water (32mL, volume ratio 3:1), and ultrasound for 10min at room temperature to fully diffuse, and then add 0.33g 2-formaldehyde After sonicating for 5 minutes, the glass bottle was tightly capped and placed in a 50°C oven for 6 hours. After the reaction, the product was centrifuged, washed, and vacuum dried to obtain a core-shell structure ZnO@ZIF-8 precursor.

[0037] (3) Preparation of monodisperse nitrogen...

Embodiment 2

[0042] (1) Preparation of ZnO nanospheres

[0043] Add 40mL of 0.1mol / L zinc acetate aqueous solution and 200mL of 0.2mol / L triethanolamine aqueous solution into a 250mL Erlenmeyer flask, stir at room temperature for 30min, and then irradiate it in a water bath at 50℃ ultrasonically for 20min, then statically Set 12h. ZnO nanospheres are obtained by centrifugal collection, washing, and vacuum drying.

[0044] (2) Preparation of ZnO@ZIF-8 precursor with core-shell structure

[0045] Add 40.0mg of ZnO nanospheres obtained in step 1) into a 40ml glass bottle containing a mixed solvent of DMF and water (32mL, volume ratio 3:1), and ultrasound for 10min at room temperature to fully diffuse, and then add 0.33g 2-formaldehyde After sonicating for 5 minutes, the glass bottle is tightly capped and placed in an oven at 70°C for 4 hours. After the reaction is completed, the product is centrifuged, washed, and vacuum dried to obtain a core-shell structure ZnO@ZIF-8 precursor.

[0046] (3) Prepa...

Embodiment 3

[0049] (1) Preparation of ZnO nanospheres

[0050] Add 40mL of 0.1mol / L zinc acetate aqueous solution and 200mL of 0.1mol / L triethanolamine aqueous solution into a 250mL Erlenmeyer flask, stir at room temperature for 30min, and then irradiate it in a water bath at 50℃ ultrasonically for 20min, then statically Set 12h. ZnO nanospheres are obtained by centrifugal collection, washing, and vacuum drying.

[0051] (2) Preparation of ZnO@ZIF-8 precursor with core-shell structure

[0052] Add 40.0mg of ZnO nanospheres obtained in step 1) into a 40ml glass bottle containing a mixed solvent of DMF and water (32mL, volume ratio 2:1), ultrasonically at room temperature for 10 minutes to fully diffuse, and then add 0.66g 2-formaldehyde After sonicating for 5 minutes, the glass bottle was tightly capped and placed in an oven at 50°C for 4 hours. After the reaction, the product was centrifuged, washed, and vacuum dried to obtain the core-shell structure ZnO@ZIF-8 precursor.

[0053] (3) Preparati...

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Abstract

The invention discloses a mono-dispersed nitrogen doped hollow carbon nano polyhedron and a preparation method thereof. The mono-dispersed nitrogen doped hollow carbon nano polyhedron takes a ZnO nano-sphere as a template and a Zn source and 2-methylimidazole as organic ligands to synthesize a core-shell-structure ZnO@ZIF-8 nano mono-crystal composite material; the core-shell-structure ZnO@ZIF-8 nano mono-crystal composite material is put into a high-temperature furnace and is calcined in an inert gas atmosphere for 2h to 4h, wherein the calcination temperature is 800 DEG C to 900 DEG C; after calcination, a carbon nano material with a hollow structure is directly obtained. A preparation process disclosed by the invention is simple, and a template removing process is not adopted. The carbon nano material with the hollow structure, which is prepared by the method disclosed by the invention, has a uniform polyhedron shape, a high specific surface area and high nitrogen content, and has a great application potential in the fields including electrochemical energy storage, catalysis, fuel batteries and the like.

Description

Technical field [0001] The invention belongs to the technical field of nano material preparation, and particularly relates to a monodisperse nitrogen-doped hollow carbon nano polyhedron and a preparation method thereof. Background technique [0002] Monodisperse hollow carbon nanomaterials, especially hollow carbon nanomaterials doped with heteroatoms (such as nitrogen, cobalt, nickel, iron, etc.), have good thermal and chemical stability, excellent electrical conductivity, and large Its specific surface area and pore volume, low density, and abundant reactive sites have a wide range of applications in the fields of electrochemical energy storage, catalysis and fuel cells. [0003] Most of the reported monodisperse hollow carbon nanomaterials are hollow carbon spheres, and their main preparation methods are electrochemical vapor deposition, template method and hydrothermal method. Among them, the template method is the most common and frequently used method for preparing hollow ca...

Claims

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Application Information

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IPC IPC(8): C01B32/15
CPCC01P2002/72C01P2004/03C01P2004/04C01P2004/30C01P2004/62
Inventor 宋肖锴刘坚鲍本州郭琳丽周雅静曹鑫王志贤
Owner JIANGSU UNIV OF TECH
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