Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for nitrogen-doped graphene

A nitrogen-doped graphene and montmorillonite technology is applied in the preparation of nitrogen-doped graphene for supercapacitors and the field of graphene preparation. problems, to achieve the effect of increasing electrochemical active sites, increasing effective specific surface area, and simple preparation process

Inactive Publication Date: 2014-10-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of nitrogen-doped graphene include chemical vapor deposition method, ammonia source pyrolysis method, nitrogen plasma discharge method, solvothermal method, and nitrogen-containing precursor conversion method, etc., but these methods require high preparation equipment and complicated operation. It is difficult to be popularized, and the obtained graphene often has serious agglomeration, small effective specific surface area, low nitrogen content, and low electrochemical activity of doped nitrogen atoms, which is not conducive to its application as a supercapacitor electrode material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for nitrogen-doped graphene
  • Preparation method for nitrogen-doped graphene
  • Preparation method for nitrogen-doped graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, first, 200 mg of hard template montmorillonite with a parallel plate structure and a layer spacing of 1 nm is uniformly dispersed in water to form a suspension with a mass fraction of 0.5 mg / mL, and a certain amount of hydrochloric acid is added to it to adjust its The pH value is 1-5. Then, 100 mg of dopamine was added as a carbon source so that the mass ratio to montmorillonite m 碳源 / m 蒙脱石 =1:2. After stirring evenly, 25 ml of a tris solution with a concentration of 10 mmol / mL was added to induce the polymerization of dopamine, and the polymerization time was 24 hours. The resulting polymer precipitate was filtered, washed and dried, calcined and carbonized in a tube furnace, and heated to 900°C at a rate of 3°C / min under a nitrogen atmosphere, and kept for 2 h. The calcined product was washed with a 30% hydrofluoric acid solution to remove the hard template, washed repeatedly with deionized water, filtered with suction, and dried to obt...

Embodiment 2

[0033] First, 200 mg of hard template montmorillonite with a parallel plate structure and a layer spacing of 3 nm is evenly dispersed in water to form a suspension with a mass fraction of 1 mg / mL, and a certain amount of hydrochloric acid is added to it to adjust its pH to 1 -5. Then, add 100 mg of pyrrole as a carbon source so that the mass ratio of montmorillonite to m 碳源 / m 蒙脱石 =1:2. After stirring evenly, 25 ml of a tris solution with a concentration of 10 mmol / mL was added to induce polymerization of pyrrole, and the polymerization time was 24 hours. The resulting polymerized precipitate was suction filtered, washed and dried, calcined and carbonized in a tube furnace, and raised to 900°C at a rate of 3°C / min under a nitrogen atmosphere, and kept for 2h. The calcined product was washed with a 30% hydrofluoric acid solution to remove the hard template, washed repeatedly with deionized water, filtered with suction, and dried to obtain high-quality nitrogen-doped graphene...

Embodiment 3

[0035] First, 100 mg of hard template montmorillonite with a parallel plate structure and a layer spacing of 2 nm is evenly dispersed in water to form a suspension with a mass fraction of 1 mg / mL, and a certain amount of hydrochloric acid is added to it to adjust its pH to 1 -5. Then, 100 mg of dopamine was added as a carbon source so that its mass ratio to montmorillonite m 碳源 / m 蒙脱石 =1:1. After stirring evenly, 25 ml of a tris solution with a concentration of 10 mmol / mL was added to induce the polymerization of dopamine, and the polymerization time was 24 hours. The resulting polymer precipitate was suction filtered, washed and dried, calcined and carbonized in a tube furnace, and kept at 900°C for 2 h at a rate of 3°C / min under a nitrogen atmosphere. The calcined product was washed with a 30% hydrofluoric acid solution to remove the hard template, washed repeatedly with deionized water, filtered with suction, and dried to obtain high-quality nitrogen-doped graphene.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for nitrogen-doped graphene, which belongs to the technical field of carbon materials. The preparation method comprises the following steps: dispersing hard template montmorillonite in water to form a suspension and adjusting a pH value to 1 to 5; dissolving nitrogen-containing organic micromolecules which are used as a carbon source in the suspension and adding a polymerization initiator to induce polymerization of the carbon source; subjecting a polymerization product to filtering and washing and drying and calcining a filter cake; and removing the hard template by using hydrofluoric acid and carrying out repeated washing by using deionized water so as to obtain the nitrogen-doped graphene. According to the invention, the cheap nitrogen-containing organic micromolecules are used as the carbon source, the parallel structural and the nanometer spatial confinement effect of the hard template are employed, so the nitrogen-doped graphene with few defects and high quality is formed in carbonization of organic matters; and the method has the advantages of simple operation, safety, no toxicity, short reaction time and low cost.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing nitrogen-doped graphene for supercapacitors, and belongs to the technical field of carbon materials. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have the advantages of large capacity, high power density, no pollution to the environment, long cycle life, and wide operating temperature range. many potential applications. In order to further increase the energy density of supercapacitors, people are constantly studying carbon-based electric double layer capacitor materials, hoping to obtain carbon materials with excellent performance in terms of specific surface area, electrical conductivity and porosity. [0003] Graphene is a new type of carbon material with a single-layer sheet structure composed of carbon atoms. It has a large theoretical specific surface area, excellent electronic conductivity and thermal con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 张校刚王婕申来法王建中徐云玲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com