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Method for preparing nitrogen-doped porous graphite by one-step hydrothermal method

A porous graphene, nitrogen-doped technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of cumbersome process, high energy consumption, low production efficiency, etc., achieve simple process, excellent catalytic performance, The effect of high production efficiency

Inactive Publication Date: 2017-05-31
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods require special equipment, the process is cumbersome, the energy consumption is high, and the production efficiency is low

Method used

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  • Method for preparing nitrogen-doped porous graphite by one-step hydrothermal method
  • Method for preparing nitrogen-doped porous graphite by one-step hydrothermal method
  • Method for preparing nitrogen-doped porous graphite by one-step hydrothermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Feed according to the mass ratio of graphene oxide to hydrogen peroxide and ammonia 1:0.1:30. Get 40mL concentration and be the graphene oxide aqueous solution of 7.5mg / mL, put it into 100mL polytetrafluoroethylene reactor liner, add 10mL mass fraction as 0.3% hydrogen peroxide solution and 30mL mass fraction as 28-30% ammonia solution. The uniformly mixed reactants were put into a hydrothermal reaction kettle, and subjected to a hydrothermal reaction in an oven at 180° C. for 6 hours to obtain nitrogen-doped porous graphene.

[0021] In order to fully understand the structural characteristics and properties of the nitrogen-doped porous graphene prepared in this example, SEM, TEM, XPS, adsorption-desorption and pore size distribution tests were carried out on it. Such as figure 1 As shown in -A, graphene oxide nanosheets are assembled into cylindrical hydrogels after hydrothermal reaction, and scanning electron microscope images confirm that the prepared nitrogen-dope...

Embodiment 2

[0023] Feed according to the mass ratio of graphene oxide to hydrogen peroxide and ammonia 1:0.05:0.05. Take 75mL concentration of 4mg / mL graphene oxide aqueous solution, put it into a 100mL polytetrafluoroethylene reactor liner, add 4.5mL hydrogen peroxide solution with a mass fraction of 0.3% and 0.05mL with a mass fraction of 28- 30% ammonia solution. The uniformly mixed reactants were put into a hydrothermal reaction kettle, and subjected to a hydrothermal reaction in an oven at 130° C. for 24 hours to obtain nitrogen-doped porous graphene.

Embodiment 3

[0025] Feed according to the mass ratio of graphene oxide to hydrogen peroxide and ammonia 1:0.4:20. Take 50mL of graphene oxide aqueous solution with a concentration of 3mg / mL, put it into a 100mL polytetrafluoroethylene reactor liner, add 20mL of hydrogen peroxide solution with a mass fraction of 0.3% and 10mL with a mass fraction of 28-30% of ammonia solution. The uniformly mixed reactants were put into a hydrothermal reaction kettle, and subjected to a hydrothermal reaction in an oven at 150° C. for 8 hours to obtain nitrogen-doped porous graphene.

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Abstract

The invention belongs to the technical field of carbon materials and particularly relates to a method for preparing nitrogen-doped porous graphite by a one-step hydrothermal method. The method comprises the following steps: adding pore-foaming agent hydrogen peroxide and nitrogen source ammonia into a graphene oxide aqueous solution, and heating the mixed solution to the temperature of 100-220 DEG C for a hydrothermal reaction, so as to obtain the N-doped porous graphite by one step. According to the method, a porous structure of the graphite is constructed, and nitrogen doping is realized, and therefore, the whole process is simple, the requirement for equipment is low, reaction conditions are milder, and the production cost is low; and the prepared nitrogen-doped porous graphite has the characteristics of large specific surface area, excellent catalytic performance and the like and can be used in the fields of electro-catalysis, super-capacitors, lithium ion batteries, organic catalysis and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon materials and organic catalysis, and specifically relates to a method for preparing nitrogen-doped porous graphene through a one-step hydrothermal method. Background technique [0002] Graphene has excellent electrical, optical, thermal and mechanical properties, as well as a high specific surface area (theoretical value is 2630m 2 / g), is a very promising new carbon material. The carbon atoms in graphene are all sp 2 Hybrid, with a perfect hexagonal honeycomb two-dimensional crystal structure. However, it is precisely because of its regular and uniform electronic structure that it weakens its catalytic activity and limits its application [Nat.Mater.2007,6,183-191]. [0003] The introduction of heteroatoms into the atomic structure of graphene can regulate its physical and chemical properties and broaden its application range. Studies have found that when graphene is doped with heteroatoms, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/32C01P2002/85C01P2004/03C01P2004/04C01P2006/17
Inventor 奚江波柳津柏正武季珉
Owner WUHAN INSTITUTE OF TECHNOLOGY
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