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Preparation method for iron-doped pleated graphene aerogel by high-temperature expansion

A technology of graphene airgel and high-temperature expansion, applied in the direction of graphene, nano-carbon, etc., can solve the problems of high contact resistance and low conductivity, reduce oxidation, increase specific surface area, reduce conductivity and mechanical properties performance effect

Inactive Publication Date: 2019-10-25
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its conductivity is still far behind that of products using metal fillers, mainly due to the slightly lower intrinsic conductivity of graphene nanosheets and the extremely high contact resistance between them.

Method used

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  • Preparation method for iron-doped pleated graphene aerogel by high-temperature expansion
  • Preparation method for iron-doped pleated graphene aerogel by high-temperature expansion
  • Preparation method for iron-doped pleated graphene aerogel by high-temperature expansion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix 300mg of anhydrous ferric chloride and 60mg of expanded graphite evenly, vacuumize, seal in a 50mL glass bottle, and heat at 400°C for 4h to prepare a pure second-order graphite intercalation compound. Dissolve the graphite intercalation compound in Dilute hydrochloric acid solution, filter and dry.

[0029] (2) The graphite intercalation compound was added into a mixed solution of 20 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid, stirred in ice water (0° C.) for 0.5 hour, 360 mg of sodium chlorate was put into the solution, and stirred at room temperature for 12 hours, The product is centrifuged and cleaned to obtain oxygen-containing group layers and ferric chloride alternately intercalated graphite.

[0030] (3) putting oxygen-containing group layers and ferric chloride intercalated graphite into an aqueous solution for ultrasonic treatment for 1 h to obtain ferric chloride intercalated graphene oxide dispersible in water.

[0031] (...

Embodiment 2

[0034] (1) Mix 300mg of anhydrous ferric chloride and 60mg of expanded graphite evenly, vacuumize, seal in a 50mL glass bottle, and heat at 400°C for 4h to prepare a pure second-order graphite intercalation compound. Dissolve the graphite intercalation compound in Dilute hydrochloric acid solution, filter and dry.

[0035] (2) Add the graphite intercalation compound into 20 mL of concentrated sulfuric acid solution, stir in ice water (0° C.) for 0.5 hours, put 360 mg of potassium permanganate into the solution, stir at room temperature for 12 hours, and centrifuge the product to obtain Oxygen-containing group layers and ferric chloride intercalate graphite alternately.

[0036] (3) putting oxygen-containing group layers and ferric chloride intercalated graphite into an aqueous solution for ultrasonic treatment for 1 h to obtain ferric chloride intercalated graphene oxide dispersible in water.

[0037] (4) Freeze-dry the ferric chloride-intercalated graphene oxide dispersion, ...

Embodiment 3

[0040] (1) Mix 300mg of anhydrous ferric chloride and 60mg of expanded graphite evenly, vacuumize, seal in a 50mL glass bottle, and heat at 400°C for 4h to prepare a pure second-order graphite intercalation compound. Dissolve the graphite intercalation compound in Dilute hydrochloric acid solution, filter and dry.

[0041] (2) The graphite intercalation compound was added into a mixed solution of 20 mL of concentrated sulfuric acid and 10 mL of concentrated nitric acid, stirred in ice water (0° C.) for 0.5 hour, 360 mg of sodium chlorate was put into the solution, and stirred at room temperature for 12 hours, The product is centrifuged and cleaned to obtain oxygen-containing group layers and ferric chloride alternately intercalated graphite.

[0042] (3) putting oxygen-containing group layers and ferric chloride intercalated graphite into an aqueous solution for ultrasonic treatment for 1 h to obtain ferric chloride intercalated graphene oxide dispersible in water.

[0043] (...

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Abstract

The invention provides a preparation method for an iron-doped pleated graphene aerogel by high-temperature expansion. The preparation method comprises the following steps: preparing a graphite material with alternate intercalation of an oxygen-containing group layer and ferric trichloride, placing the graphite material into an aqueous solution, carrying out ultrasonic stripping so as to obtain ferric trichloride intercalated graphene oxide which is dispersible in water, carrying out freeze-drying so as to obtain a ferric trichloride intercalated graphene oxide aerogel, and carrying out high-temperature treatment so as to obtain the iron-doped pleated graphene aerogel. The method provided by the invention has the following advantages: the damage to a graphene sheet structure is effectivelyreduced; a high temperature is utilized for highly-efficient removal of oxygen-containing groups; the ferric trichloride is decomposed to generate gas; a nanosheet layer can be pleated; the specific surface area of an aerogel is increased; mechanical elasticity of the aerogel is reinforced; iron ions are uniformly distributed among graphene sheets; conductivity of a graphene nanosheet is effectively improved; and conductivity of the aerogel is improved.

Description

technical field [0001] The invention relates to the field of graphene airgel preparation, in particular to a high-temperature expansion preparation method of iron-doped wrinkled graphene airgel. Background technique [0002] Graphene airgel refers to a three-dimensional porous network structure with graphene as the main body. Based on its unique overall structure, high specific surface area and excellent electrical conductivity, it endows it with broad applications in the fields of electrode materials, catalytic carriers and seawater desalination. For example, it can be used as electrodes of electrochemical double-layer capacitors, new hydrogen storage materials, etc. The sol-gel method is the most commonly used method to prepare graphene aerogels, but face-to-face stacking of the sheets inevitably occurs during the sheet-gel assembly process, and the final airgel has a small specific surface area and a brittle structure. fragile. Although a large number of studies have sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184C01P2006/40
Inventor 苗中正刘媛江宇
Owner YANCHENG TEACHERS UNIV
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