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A kind of preparation method of nio@graphene fiber supercapacitor electrode material

A graphene fiber, supercapacitor technology, used in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve problems such as low specific capacitance value, limited potential applications, low energy density of capacitor devices, etc., to improve specific capacitance. , High specific capacity, excellent specific capacitance effect

Active Publication Date: 2019-01-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure graphene fiber materials usually have low specific capacitance value, and capacitor devices have low energy density, which limits its wide potential applications.

Method used

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  • A kind of preparation method of nio@graphene fiber supercapacitor electrode material
  • A kind of preparation method of nio@graphene fiber supercapacitor electrode material
  • A kind of preparation method of nio@graphene fiber supercapacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) the graphene oxide aqueous dispersion is centrifuged and concentrated, and then ultrasonically treated for 20min, thereby obtaining the graphene oxide spinning solution;

[0028] (2) Use a syringe pump to inject the graphene oxide spinning solution into the 2 In the coagulation bath composed of / ethanol solution, after immersion in the coagulation bath for 30min, the obtained fiber was repeatedly washed 3 times with deionized water and ethanol, and the residual coagulation solution was washed away, so as to obtain graphene oxide fiber and collect it on the support , drying the collected fibers at high temperature under vacuum conditions;

[0029] (3) The graphene oxide fibers were reduced in hydroiodic acid at 120°C for 8h, and then 2 / Ar (volume ratio is 1:1) under the reducing atmosphere of 1000 ° C thermal reduction, natural cooling to room temperature and then take out the fiber, so as to prepare graphene fiber;

[0030] (4) Mix nickel sulfate hexahydrate, sod...

Embodiment 2

[0033] (1) the graphene oxide aqueous dispersion is centrifuged and concentrated, and then ultrasonically treated for 30min, thereby obtaining the graphene oxide spinning solution;

[0034] (2) Use a syringe pump to inject the graphene oxide spinning solution into the 2 In the coagulation bath composed of / ethanol solution, after immersing in the coagulation bath for 20min, the obtained fiber was repeatedly washed 3 times with deionized water and ethanol, and the residual coagulation solution was washed away, so as to obtain graphene oxide fiber and collect it on the support , drying the collected fibers at high temperature under vacuum conditions;

[0035] (3) The graphene oxide fibers were reduced in hydroiodic acid at 90°C for 12h, and then 2 / Ar (volume ratio is 1:4) under the reducing atmosphere of 1000 ° C thermal reduction, natural cooling to room temperature and then take out the fiber, so as to prepare the graphene fiber;

[0036] (4) Mix nickel sulfate hexahydrate,...

Embodiment 3

[0039] (1) the graphene oxide aqueous dispersion is centrifuged and concentrated, and then ultrasonically treated for 30min, thereby obtaining the graphene oxide spinning solution;

[0040] (2) Use a syringe pump to inject the graphene oxide spinning solution into the 2 In the coagulation bath composed of / ethanol solution, after immersion in the coagulation bath for 30min, the obtained fiber was repeatedly washed 5 times with deionized water and ethanol, and the residual coagulation solution was washed away, so as to obtain graphene oxide fiber and collect it on the support , drying the collected fibers at high temperature under vacuum conditions;

[0041] (3) The graphene oxide fibers were reduced in hydroiodic acid at 120°C for 12h, and then 2 / Ar (volume ratio: 1:2) under a reducing atmosphere of 1000 ° C thermal reduction, natural cooling to room temperature and then take out the fiber, so as to prepare graphene fiber;

[0042](4) Mix nickel sulfate hexahydrate, sodium ...

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Abstract

The invention discloses a manufacturing method of a NiO@graphene fibre supercapacitor electrode material. The manufacturing method comprises the following steps of carrying out reduction and oxidation on graphene, and acquiring a graphene fiber; and on a surface of the graphene fiber, through a hydrothermal method, cladding and growing NiO and the like. A microstructure of the manufactured NiO@graphene fibre supercapacitor electrode material is a NiO cladding graphene fiber which possesses a large specific surface area. A specific surface area of an electrode and a space utilization rate are effectively increased, and a specific capacitance, a rate capability and electrochemical stability of the electrode material are increased too. In a super-capacitor three-electrode system test, the material manufactured in the invention shows a 134Fg<-1> high specific capacity under a 2Ag<-1> current density and possesses good electrochemical performance. The manufacturing method possesses advantages that the method is simple; and cost is low and so on.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to a supercapacitor electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the continuous consumption of fossil energy, and the increasing environmental pollution, it is becoming more and more important to study a high-efficiency, low-cost, environmentally friendly, and high-performance energy conversion and storage system. Supercapacitors have attracted much attention due to their high energy rate density, wide operating temperature range, long life, and environmental friendliness. It has important and broad application prospects and has become a research hotspot all over the world. [0003] Supercapacitor is a kind of electrochemical capacitor, which can be divided into two types according to the charge storage mechanism: one type of electrochemical double layer capacitor, the electrode material of this t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/46H01G11/24H01G11/86
CPCY02E60/13
Inventor 吕建国王伟成
Owner ZHEJIANG UNIV
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