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Preparation and application of polyaniline nanowire/graphene hollow sphere-graphene oxide

A graphene and hollow sphere technology is applied in the field of preparation of polyaniline nanowires/graphene hollow spheres-graphene oxide composite materials, which can solve the problems of low specific capacitance, polyaniline fracture and even falling off from graphene hollow spheres. , to achieve the effect of improving conductivity, excellent stability, and large specific capacitance

Inactive Publication Date: 2019-09-13
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the EDLC mechanism of graphene, its specific capacitance is relatively low. As an excellent conductive polymer, polyaniline has the advantages of high theoretical specific capacity (2.0×103F / g), good flexibility and easy synthesis, so The combination of graphene hollow spheres and polyaniline will give full play to the advantages of both and further improve the electrochemical performance of supercapacitors, but polyaniline may break or even fall off from graphene hollow spheres during long-term charging and discharging. Attaching a layer of graphene oxide on polyaniline nanowires / graphene hollow spheres will further improve the stability of the composite

Method used

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Embodiment 1

[0032] The preparation method of polyaniline nanowire / graphene hollow sphere-graphene oxide comprises the following steps:

[0033] 1. Preparation of graphene hollow spheres by template-directed carbon segregation

[0034] (1) Preparation of nickel nanoparticles: respectively prepare nickel chloride, 80% hydrazine hydrate and 50% sodium hydroxide solution with a molar ratio of 1:(2~4):(2~4). Dissolve in water, then add hydrazine hydrate, stir evenly, add sodium hydroxide solution, react in a water bath at 60-80 °C for 3-5 hours until gray precipitate is obtained, then wash and freeze-dry to obtain nickel nanoparticles;

[0035] (2) Use the prepared nickel nanoparticles as a template to prepare graphene hollow spheres: put 2-3 g of nickel nanoparticles into a round-bottomed flask, and add 40-60 mL of triethylene glycol, stir evenly and add 4-6 drops of 50 % sodium hydroxide solution, heated to reflux at 220-250°C for 6-12h, washed and dried the precipitate, heat-treated at 500...

Embodiment 2

[0043] The preparation method of polyaniline nanowire / graphene hollow sphere-graphene oxide composite material comprises the following steps:

[0044] The difference between this embodiment and Example 1 is: in step 3 (2), the mass of graphene oxide is 1 to 2 mg, the ultrasonic time of graphene oxide is 3 to 4 h, and the stirring time in step 3 (3) is 4 to 4 h. 6h, other is the same as specific embodiment 1;

Embodiment 3

[0046] The preparation method of polyaniline nanowire / graphene hollow sphere-graphene oxide composite material comprises the following steps:

[0047]The difference between this embodiment and Example 1 and Example 2 is: in step 3 (2), the mass of graphene oxide is 1-1.5 mg, the ultrasonic time of graphene oxide is 3.5-4 h, and in step 3 (3) The stirring time is 5~6h, and the others are the same as those in Example 1 and Example 2;

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Abstract

The invention belongs to the field of nanomaterial preparation and discloses preparation and application of polyaniline nanowire / graphene hollow sphere-graphene oxide. The preparation comprises the steps of firstly preparing graphene hollow spheres by taking nickel nanoparticles as a template and then growing polyaniline nanowires on the surfaces of the graphene hollow spheres through in-situ polymerization of an aniline monomer; secondly, modifying the surfaces of the obtained polyaniline nanowires / graphene hollow spheres (PANI / HGBs) through hexadecyl trimethyl ammonium bromide to positivelycharge the polyaniline nanowires / graphene hollow spheres; and finally mixing the modified polyaniline nanowires / graphene hollow spheres with graphene oxide suspension, and absorbing graphene oxide (GO) with negative charges to the polyaniline nanowires / graphene hollow spheres with positive charges through electrostatic self-assembly to obtain a polyaniline nanowire / graphene hollow sphere-grapheneoxide composite material. The prepared polyaniline nanowire / graphene hollow sphere-graphene oxide composite material has high specific capacitance of 690F / g at the current density of 1A / g when used asa supercapacitor electrode material. The polyaniline nanowire / graphene hollow sphere-graphene oxide composite material still has the capacitance retention rate of 90% after 5,000 charge-discharge cycles at the current density of 1A / g after being assembled into a symmetrical supercapacitor.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and relates to the preparation and application of a polyaniline nanowire / graphene hollow sphere-graphene oxide composite material. Background technique [0002] Supercapacitors have attracted much attention due to their fast charge-discharge rate, high power density, and long cycle life. According to different storage mechanisms, supercapacitors can be divided into two basic types: electric double layer capacitors (EDLC) and pseudocapacitors. EDLC has good cycling stability, but its specific capacitance is relatively low (below 200F / g). Pseudocapacitors generally offer higher capacitance, but their stability and rate performance are relatively poor. To overcome this problem, it is an effective strategy to combine conductive polymers with carbon materials, which can provide additional mechanical support and make room for the possible volume expansion and contraction of conductive polymers ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/48H01G11/86
CPCH01G11/24H01G11/30H01G11/36H01G11/48H01G11/86Y02E60/13
Inventor 岳红彦张腾高鑫陈宏涛郭鑫睿吴鹏飞
Owner HARBIN UNIV OF SCI & TECH
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