Non-carbon heteroatom-modified porous graphene framework and preparation method thereof

A technology of porous graphene and heteroatoms, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve problems such as difficult multi-element co-doping, poor conductivity, complex process, etc., to promote research and industrialization , Promote high added value, simple and safe process

Active Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation of porous graphene is mainly through the etching and assembly of graphene oxide (Peng Xinsheng et al., patent publication number: CN104743548A; Han Baohang, etc., patent publication number: CN104649253A), but there are many defects and poor conductivity; or Chemical vapor deposition of graphene on the surface of the hard template (Li Jiajun et al., patent publication number: CN105217617A; Tang C. et al., Adv. Mater., 2015, 27, 4516-4522), but the process is c...

Method used

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  • Non-carbon heteroatom-modified porous graphene framework and preparation method thereof
  • Non-carbon heteroatom-modified porous graphene framework and preparation method thereof
  • Non-carbon heteroatom-modified porous graphene framework and preparation method thereof

Examples

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Embodiment 1

[0028] Example 1: Using MgO as a template to prepare a porous graphene skeleton decorated with N atoms

[0029] The gelatinized pullulan is used as the carbon source, melamine is used as the nitrogen source, and the carbon source and non-carbon heteroatom source are fed according to the molar ratio of carbon atoms and non-carbon heteroatoms at 15:1. , and then added pre-prepared MgO nanosheets as templates for catalytic graphitization, its morphology see figure 1, the mass ratio of the feed mass to the total mass of carbon source and non-carbon heteroatom source is 10:1, continue to mix well to make a slurry, and fully dry it in an oven at 80°C; place the dried ternary solid mixture in Calcined at 950°C for 2h in an argon atmosphere, soaked in hydrochloric acid, stirred at 80°C for 12h, purified to remove the template, filtered, washed, and dried to obtain a porous graphene skeleton decorated with N atoms. The morphology of the obtained skeleton is as follows figure 2 As sh...

Embodiment 2

[0030] Example 2: Using vermiculite as a template to prepare N, a porous graphene skeleton co-modified by P atoms

[0031] With chitosan as the carbon source, dicyandiamide as the nitrogen source, and triphenylphosphine as the phosphorus source, the carbon source and the non-carbon heteroatom source are fed in a molar ratio of 100:1 according to the carbon atom and the non-carbon heteroatom source. Add it into water, stir and mix it well, then add pre-prepared vermiculite into it as a template for catalytic graphitization, the ratio of the mass of the feed to the total mass of the carbon source and non-carbon heteroatom source is 20:1, continue to mix well, Make a slurry and fully dry it in an oven at 100°C; place the dried ternary solid mixture in a nitrogen atmosphere, calcinate it at 1500°C for 12 hours, soak the product in hydrochloric acid, stir it at 80°C for 12 hours, and filter Then soak in hydrofluoric acid, stir at 100°C for 12 hours, purify and remove the template, ...

Embodiment 3

[0032] Example 3: Using CaO as a template to prepare B, P, a porous graphene skeleton co-modified by O atoms

[0033] Glucose is used as carbon source, triphenylborane is used as boron source, phytic acid is used as phosphorus source and oxygen source, and the carbon source and non-carbon heteroatom source are fed according to the molar ratio of carbon atom and non-carbon heteroatom source at 5:1. Add it to water in turn, stir and mix thoroughly, and then in-situ synthesize CaO in it as a template for catalytic graphitization. The mass ratio of the synthesized template to the total mass of carbon source and non-carbon heteroatom source is 5:1, continue to mix well, Make a slurry and fully dry it in an oven at 100°C; place the dried ternary solid mixture in a helium atmosphere, and calcinate it at 500°C for 24 hours, soak the product in hydrochloric acid, and stir it at 80°C for 5 hours, After purifying and removing the template, the porous graphene skeleton co-modified with B,...

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Abstract

The invention discloses a non-carbon heteroatom-modified porous graphene framework and a preparation method thereof, and belongs to the technical field of novel material preparation. The framework is of a three-dimensional structure formed by assembling graphene slices, a supporting cavity with the size of 50-5000 nm is presented, and 80%-99% of non-carbon heteroatoms are modified on the edges of the graphene slices and holes. The non-carbon heteroatom-modified porous graphene framework is prepared by calcining a ternary solid mixture of a carbon source, a non-carbon heteroatom source and a catalytic graphitization template at high temperature, and in-situ doping is achieved. The framework enriches the varieties of carbon nanomaterials, supplies a hole structure and non-carbon heteroatom-modified graphene material which is controllable in adjustment and has the wide application prospect in the fields of electrochemical energy storage, heterogeneous catalysis, adsorptive separation and the like. Meanwhile, the efficient low-cost graphene preparation method is achieved, the technology is simple and safe, the raw materials are rich and cheap, research and industrialization of the graphene material are effectively promoted, and the high additional value of the cheap raw materials, production of graphene-related energy materials and development of energy industry are promoted.

Description

technical field [0001] The invention belongs to the technical field of novel materials and their preparation, and in particular relates to a non-carbon heteroatom-modified porous graphene skeleton and a preparation method thereof. Background technique [0002] Graphene is a new material of single-layer planar crystal of carbon atoms. It is an emerging nanomaterial. Its unique single-layer structure was once thought to be unable to exist stably. Since British physicists successfully stripped single-layer graphene from graphite in 2004 and won the Nobel Prize, the development and application of graphene has attracted widespread attention. In October 2015, in the technology roadmap for the first key areas of "Made in China 2025" released by the state, graphene materials, as one of the four major priorities of cutting-edge new materials, are considered to be super materials that will dominate future high-tech competition. Market prospects It is huge and is expected to give birt...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/04C01B2204/32C01P2004/04C01P2006/16
Inventor 张强唐城魏飞
Owner TSINGHUA UNIV
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