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Nitrogen-doped three-dimensional nano porous carbon/porous graphene composite material and preparation method thereof

A technology of porous graphene and nanoporous carbon, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as low conversion efficiency and reduced graphene electronic conductivity, and achieve wide applicability and high specific surface area , the effect of high catalytic performance

Inactive Publication Date: 2016-10-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using partially reduced graphene oxide as the counter electrode of DSSCs exhibits a low conversion efficiency, about 40% of that of Pt-based cells.
This is due to the fact that partially reduced graphene oxide has too many oxygen-containing groups, which reduces the electronic conductivity of graphene.

Method used

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  • Nitrogen-doped three-dimensional nano porous carbon/porous graphene composite material and preparation method thereof
  • Nitrogen-doped three-dimensional nano porous carbon/porous graphene composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 3.2ml 5mg ml -1 Add 6.4ml of methanol to the GO aqueous solution, then add 12ml of methanol solution containing 0.36g of zinc nitrate hexahydrate and 20ml of methanol solution containing 0.8g of 2-methylimidazole, stir for 3 hours and centrifuge to obtain GO / ZIF gray precipitate; Dissolve in 20ml of ethanol, add 10ul 40% hydrofluoric acid as etchant, mix well, transfer the mixed solution to a 50ml reactor and heat to 180°C for 6h hydrothermal reaction; the obtained ZIF / porous graphene The three-dimensional structure was transferred to a petri dish, washed with ethanol until the pH value was neutral, then frozen at -50°C for 6 hours, and freeze-dried for 12 hours; the dried ZIF / porous graphene three-dimensional structure was transferred to a tube furnace and heated in argon Keep at 800°C for 3 hours under protection, ZIF is carbonized to form porous carbon supported on the surface of graphene sheets in a three-dimensional structure, at the same time, nitrogen doping in Z...

Embodiment 2

[0027] 0.8ml 5mg ml -1 Add 6.4ml methanol to the GO aqueous solution, then add 12ml methanol solution containing 0.1g zinc nitrate hexahydrate and 20ml methanol solution containing 0.5g 2-methylimidazole, stir for 2h and centrifuge to get GO / ZIF gray precipitate; Dissolve in 10ml of ethanol, add 5ul 40% hydrofluoric acid as an etchant, mix well, transfer the mixed solution to a 50ml reactor and heat to 180°C for 3h of hydrothermal reaction; the obtained ZIF / porous graphene The three-dimensional structure was transferred to a petri dish, washed with ethanol until the pH value was neutral, then frozen at -50°C for 6 hours, and then freeze-dried for 6 hours; the dried ZIF / porous graphene three-dimensional structure was transferred to a tube furnace and heated in argon Keep at 500℃ for 1h under protection, ZIF is carbonized to form porous carbon supported on the surface of graphene sheets in a three-dimensional structure, and nitrogen doping in ZIF enters the graphene network duri...

Embodiment 3

[0029] 6.4ml 5mg ml -1 Add 6.4ml of methanol to the GO aqueous solution, then add 12ml of methanol solution containing 0.6g of zinc nitrate hexahydrate and 20ml of methanol solution containing 1g of 2-methylimidazole, stir for 6 hours and centrifuge to obtain GO / ZIF gray precipitate; re-dissolve after fully washing To 30ml of ethanol, add 50ul 40% hydrofluoric acid as an etchant, mix well, transfer the mixed solution to a 50ml reactor and heat to 180°C for 12h of hydrothermal reaction; the obtained ZIF / porous graphene three-dimensional The structure was transferred to a petri dish, washed with ethanol until the pH value was neutral, then frozen at -50°C for 12 hours, and then freeze-dried for 24 hours; the dried ZIF / porous graphene three-dimensional structure was transferred to a tube furnace, under the protection of argon Keep at 1000°C for 6 hours, ZIF is carbonized to form porous carbon supported on the surface of graphene sheets in the three-dimensional structure, and nitr...

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Abstract

The invention discloses a nitrogen-doped three-dimensional nano porous carbon / porous graphene composite material and a preparation method thereof on the basis of a hydrothermal method. The preparation method includes: adsorbing a ZIF (zeolitic imidazolate framework) material onto GO (graphene oxide) to form GO / ZIF; adding an etching agent into a GO / ZIF ethanol solution to realize hydrothermal reaction, and enabling GO reduction in the reaction process along with GO etching and assembly of a three-dimensional network structure to obtain a ZIF / porous graphene three-dimensional structure; performing carbonation reaction to enable ZIF carbonation to form porous carbon loaded on the surface of a graphene lamella in the three-dimensional structure, and allowing nitrogen in ZIF to be doped in a graphene network to obtain the nitrogen-doped three-dimensional nano porous carbon / porous graphene composite material. The nitrogen-doped three-dimensional nano porous carbon / porous graphene composite material is high in specific surface area and catalytic activity, and the preparation process based on the hydrothermal method is simple in operation and high in repeatability.

Description

technical field [0001] The present invention relates to a functional composite carbon material with a three-dimensional structure and a preparation method thereof, more particularly, a nitrogen-doped three-dimensional structure nanoporous carbon / porous graphene composite material and a preparation method based on a hydrothermal method. It belongs to the field of new functional materials. Background technique [0002] Three-dimensional functional composite materials with precise nanostructures are currently a hot research field. Using highly catalytic, low-cost carbon materials, especially graphene and its composites to replace noble metals as electrode materials is one of the current research directions. High-efficiency carbon materials can be used in fuel cells, photovoltaic cells and other fields, and are of great significance for the efficiency and cost reduction of energy devices. [0003] At present, the performance of graphene-based electrodes is not as good as that o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCH01M4/364H01M4/583H01M10/0525Y02E60/10
Inventor 于美章锦丹刘建华孟燕兵李松梅丁笑文
Owner BEIHANG UNIV
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