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Double-shell-layer and yolk-shell-layer nitrogen-doped hollow porous carbon and preparation methods thereof and application thereof

A hollow porous, nitrogen-doped technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of single pore structure, reduction, difficulty in obtaining hierarchical pores, hollow and hole structures, etc., and achieve specific surface area big effect

Inactive Publication Date: 2018-12-07
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous carbon obtained from a single ZIF material has a single pore structure, and when the degree of graphitization increases, the nitrogen doping content tends to decrease, and it is difficult to obtain hierarchical pores, hollow and hole structures.

Method used

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  • Double-shell-layer and yolk-shell-layer nitrogen-doped hollow porous carbon and preparation methods thereof and application thereof
  • Double-shell-layer and yolk-shell-layer nitrogen-doped hollow porous carbon and preparation methods thereof and application thereof
  • Double-shell-layer and yolk-shell-layer nitrogen-doped hollow porous carbon and preparation methods thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Preparation of double-shell nitrogen-doped hollow porous carbon precursor ZIF-8@ZIF-67@ZIF-8@ZIF-67 with four-layer core-shell structure

[0063] (1) At room temperature of 25°C, 2mmol of zinc chloride was dissolved in 5ml of ethanol solution, and 10mmol of 2-methylimidazole was dissolved in 5ml of ethanol solution; the two were mixed and stirred overnight for 12 hours to prepare ZIF-8 crystal particles;

[0064] (2) ultrasonically disperse the ZIF-8 particles obtained in step (1) in 400ml methanol solution containing 120mmol 2-methylimidazole, then stir and add 100ml methanol solution containing 20mmol cobalt acetate; leave standstill at room temperature for 10 minutes after mixing completely Hours, prepare ZIF-8@ZIF-67 two-layer core-shell structure;

[0065] (3) Ultrasonic disperse the ZIF-8@ZIF-67 particles obtained in step (2) in 400ml methanol solution containing 120mmol 2-methylimidazole, then stir and add 100ml methanol solution containing 20mmol zinc acetate...

Embodiment 2

[0070] 1. Preparation of egg yolk-single-shell nitrogen-doped hollow porous carbon precursor ZIF-67@ZIF-8@ZIF-67 three-layer core-shell structure

[0071] (1) At a room temperature of 25°C, 2 mmol of cobalt sulfate was dissolved in 5 ml of methanol solution, and 40 mmol of 2-methylimidazole was dissolved in 50 ml of methanol solution; the two were stirred and mixed overnight for 12 hours to prepare ZIF-67 crystal particles;

[0072] (2) ultrasonically disperse the ZIF-67 granules obtained in step (1) in 400ml methanol solution containing 100mmol 2-methylimidazole, then stir and add 100ml methanol solution containing 20mmol zinc acetate; after mixing completely, let stand at room temperature for 8 Hours, prepare ZIF-67@ZIF-8 two-layer core-shell structure;

[0073] (3) Ultrasonic disperse the ZIF-67@ZIF-8 particles obtained in step (2) in 400ml methanol solution containing 100mmol 2-methylimidazole, then stir and add 100ml methanol solution containing 20mmol cobalt acetate; Af...

Embodiment 3

[0077] 1. Preparation of egg yolk-double-shell nitrogen-doped hollow porous carbon precursor ZIF-67@ZIF-8@ZIF-67@ZIF-8@ZIF-67 five-layer core-shell structure

[0078] (1) At a room temperature of 25°C, 2 mmol of cobalt nitrate was dissolved in 5 ml of methanol solution, and 40 mmol of 2-methylimidazole was dissolved in 100 ml of methanol solution; the two were mixed and stirred overnight for 12 hours to prepare ZIF-67 crystal particles;

[0079] (2) Ultrasonic disperse the ZIF-67 particles obtained in step (1) in 400ml methanol solution containing 80mmol 2-methylimidazole, then stir and add 100ml methanol solution containing 20mmol zinc acetate; leave standstill at room temperature for 10 minutes after mixing completely Hours, prepare ZIF-67@ZIF-8 two-layer core-shell structure;

[0080] (3) Ultrasonic disperse the ZIF-67@ZIF-8 particles obtained in step (2) in 400ml methanol solution containing 80mmol 2-methylimidazole, then stir and add 100ml methanol solution containing 20m...

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Abstract

The invention discloses double-shell-layer and yolk-shell-layer nitrogen-doped hollow porous carbon and preparation methods thereof and application thereof. A ZIF-8@ZIF-67@ZIF-8@ZIF-67 four-layer nuclear shell structure, a ZIF-67@ZIF-8@ZIF-67 three-layer nuclear shell structure and a ZIF-67@ZIF-8@ZIF-67@ZIF-8@ZIF-67 five-layer nuclear shell structure are prepared at a room temperature and the prepared nuclear shell structures are used as precursors; carbonization is carried out directly to obtain double-shell-layer, yolk-single-shell-layer, and yolk-double-shell-layer nitrogen-doped hollow porous carbon. According to the invention, the preparation method is simple and controllable; and production and scaling up can be realized; and the obtained nitrogen-doped hollow porous carbon has characteristics of large specific surface area, nitrogen doping, graphitization, hierarchical pore structure, and hollow and hole structure and has the excellent electrochemical performance. The nitrogen-doped hollow porous carbon can be used as a supercapacitor electrode material.

Description

technical field [0001] The invention relates to a nitrogen-doped hollow porous carbon with double shells and egg yolk shells, a preparation method and application thereof. Background technique [0002] Supercapacitor (Supercapacitor) has the characteristics of high specific capacitance, high power density, fast charge and discharge rate, long service life, maintenance-free, green environmental protection and wide temperature range, which has attracted extensive research. Hollow carbon materials not only have the advantages of low density of hollow particles, good surface permeability, and large total pore volume, but also have the characteristics of large specific surface area, high stability, and porosity, and are ideal supercapacitor electrode materials. [0003] At present, the main preparation method of hollow carbon is the template method, but this method uses a large amount of acid and alkali in the later stage of template removal, which pollutes the environment, and t...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/32H01G11/44H01M4/587H01M10/0525
CPCH01G11/24H01G11/32H01G11/44H01M4/587H01M10/0525Y02E60/10Y02E60/13
Inventor 张竞成凤仪钱刚肖客松
Owner HEFEI UNIV OF TECH
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