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Carbon nano fiber-graphene composite aerogel and cooperative assembly preparation method thereof

A graphene aerogel and graphene composite technology, which can be used in hybrid capacitor electrodes and other directions, can solve the problems of limited electrospinning technology collection methods and unsatisfactory results, and achieve rich pore structures, ingenious design ideas, and preparation processes. simple effect

Inactive Publication Date: 2015-12-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the collection method of electrospinning technology, the final macroscopic product obtained by the traditional deposition collection method can only be a fibrous film rather than a three-dimensional aerogel.
Some researchers have proposed that specially designed receiving devices can be used to solve the above problems, but the results are not ideal

Method used

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  • Carbon nano fiber-graphene composite aerogel and cooperative assembly preparation method thereof
  • Carbon nano fiber-graphene composite aerogel and cooperative assembly preparation method thereof
  • Carbon nano fiber-graphene composite aerogel and cooperative assembly preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Weigh 1 g of polyacrylonitrile powder and add 10 mL of DMF, and stir at high speed for 5 h under heating in an oil bath at 80° C. to obtain a transparent polyacrylonitrile solution with a yellowish color. Electrospinning is carried out on the above polyacrylonitrile solution, and the spinning process conditions are set as follows: flow rate 0.3mm / min, voltage 20kV, receiving distance 15cm. The prepared polyacrylonitrile nanofibers were finally deposited on the drum receiver in the form of nanofiber films, and the fiber films were removed and dried in a vacuum oven for 24-28 hours to remove residual solvents. The prepared polyacrylonitrile fiber membrane was fixed on a flat plate and placed in a programmed temperature-controlled oven for pre-oxidation treatment. The temperature was raised from room temperature to 250 °C at a rate of 1 °C / min and kept for 2 hours, and then naturally lowered to room temperature. The color of the oxidized polyacrylonitrile fiber membrane be...

Embodiment 2

[0055] Weigh 1 g of polyacrylonitrile powder and add 10 mL of DMF, and stir at high speed for 5 h under heating in an oil bath at 80° C. to obtain a transparent polyacrylonitrile solution with a yellowish color. Electrospinning is carried out on the above polyacrylonitrile solution, and the spinning process conditions are set as follows: flow rate 0.3mm / min, voltage 20kV, receiving distance 15cm. The prepared polyacrylonitrile nanofibers were finally deposited on the drum receiver in the form of nanofiber films, and the fiber films were removed and dried in a vacuum oven for 24-28 hours to remove residual solvents. The prepared polyacrylonitrile fiber membrane was fixed on a flat plate and placed in a programmed temperature-controlled oven for pre-oxidation treatment. The temperature was raised from room temperature to 250 °C at a rate of 1 °C / min and kept for 2 hours, and then naturally lowered to room temperature. The color of the oxidized polyacrylonitrile fiber membrane be...

Embodiment 3

[0058] The graphene oxide prepared by the Hummers method was sonicated for 2 h to obtain a graphene oxide dispersion with a concentration of 4 mg / mL. The above-mentioned graphene oxide dispersion is divided into molds, placed in liquid nitrogen for 10 minutes to make it fully frozen, and then the frozen graphene oxide is transferred to a freeze dryer, and after drying for 48 hours, unformed flocculent graphite oxide is obtained ene instead of graphene oxide aerogels.

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Abstract

The invention belongs to the field of nano fiber carbon aerogel, and specifically discloses a carbon nano fiber-graphene composite aerogel and a cooperative assembly preparation method thereof. The method comprises: preparing polyacrylonitrile nano fibers by adopting an electrostatic spinning method; preparing surface-functionalized oxidized polyacrylonitrile nano fibers by temperature programmed pre-oxidation; and homogenizing the oxidized polyacrylonitrile nano fibers, then performing cooperative assembly on the oxidized polyacrylonitrile nano fibers and graphene oxide, and performing freeze drying and high-temperature carbonization to obtain the carbon nano fiber-graphene composite aerogel. The preparation method is simple, efficient and environment-friendly, and does not adopt any toxic reagent; the prepared carbon nano fiber-graphene composite aerogel has the advantages of light weight, multiple pores, good elasticity and the like; and the method solves the problem that the traditional film-like electrostatic spinning fiber material is difficult in three-dimensional forming. The prepared carbon nano fiber-graphene composite aerogel serving as a super-capacitor electrode material has excellent capacitance performance.

Description

technical field [0001] The invention belongs to the technical field of nanofiber carbon aerogels, and in particular relates to a carbon nanofiber-graphene composite aerogel and a preparation method for synergistic assembly thereof. Background technique [0002] Carbon airgel is widely used as catalyst carrier, adsorption material, hydrogen storage material and various electrode materials because of its advantages of high porosity, light weight, large specific surface area, easy adjustment of pore structure, good stability, and high conductivity. etc., are considered to be one of the ten most potential new materials in the future, and thus become a research hotspot. [0003] There are many three-dimensional structures based on one-dimensional materials in nature, such as spider webs and bone tissues, all of which have low density and good structural stability. Existing studies have shown that introducing one-dimensional carbon materials such as carbon nanotubes and carbon na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/34H01G11/36C01B31/02
CPCY02E60/13
Inventor 刘天西黄云鹏缪月娥张由芳赖飞立鲁恒毅
Owner FUDAN UNIV
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