3D-graphene/foam nickel, preparation method thereof and application thereof

A nickel foam and graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of reduced redox reaction, low electrochemical performance, and reduced specific surface area of ​​graphene materials, etc., to achieve easy operation , large specific surface area, excellent effect of multi-level pore structure

Inactive Publication Date: 2019-03-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, due to the large pore size (~hundreds of nanometers) of graphene airgel and the physical stacking of graphene nanosheets leads to high resistance, which leads to its low electrochemical performance, which is not conducive to direct use in supercapacitors. and other energy storage fields
Graphene foam usually adopts CVD method to pave a layer of graphene on the nickel foam. Although the introduction of 2D graphene can greatly improve the conductivity of the material, the ratio of graphene materials is greatly reduced due to the stacking of graphene sheets together. Surface area, thereby reducing the contact area between the active material and the electrolyte, resulting in reduced redox reactions and lower specific capacity

Method used

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  • 3D-graphene/foam nickel, preparation method thereof and application thereof
  • 3D-graphene/foam nickel, preparation method thereof and application thereof
  • 3D-graphene/foam nickel, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Pretreatment of nickel foam

[0031] Nickel foam was ultrasonically cleaned with 6 mol / L HCl, ethanol and deionized water for 20 min respectively, and dried in vacuum at 60 °C for 1 h.

[0032] (2) Preparation of 3D-graphene / nickel foam

[0033] The graphene oxide prepared by the modified Hummus method and obtained by ordinary drying was formulated into a 0.2 mg / mL homogeneous graphene oxide solution, and then KOH solution was added to adjust the pH to about 7.2.

[0034] Put 30mL graphene oxide solution and a piece of pretreated nickel foam into a 50mL polytetrafluoro reactor for hydrothermal reaction, the reaction temperature is 180°C, and the reaction time is 36h.

[0035] The obtained product was repeatedly rinsed with deionized water, and dried in a vacuum oven at 60°C for 10 hours. The SEM image and physical image of the obtained 3D-graphene / nickel foam were as follows: figure 1 and figure 2 shown.

[0036] (3) Preparation of foamed nickel / 3D-graphene / Ni-...

Embodiment 2

[0041] (1) Pretreatment of nickel foam

[0042] Nickel foam was ultrasonically cleaned with 6 mol / L HCl, ethanol and deionized water for 20 min respectively, and dried in vacuum at 60 °C for 1 h.

[0043] (2) Preparation of 3D-graphene / nickel foam

[0044] The graphene oxide obtained by freeze-drying prepared by the improved Hummus method was formulated into a 0.15 mg / mL homogeneous graphene oxide solution, and then KOH solution was added to adjust the pH to about 7.5. Put 30mL graphene oxide solution and a piece of pretreated nickel foam into a 50mL polytetrafluoro reactor for hydrothermal reaction, the reaction temperature is 180°C, and the reaction time is 48h. The obtained product was repeatedly washed with deionized water, and dried in a vacuum oven at 60° C. for 10 h.

Embodiment 3

[0046] (1) Pretreatment of nickel foam

[0047] Nickel foam was ultrasonically cleaned with 6 mol / L HCl, ethanol and deionized water for 20 min respectively, and dried in vacuum at 60 °C for 1 h.

[0048] (2) Preparation of 3D-graphene / nickel foam

[0049] The graphene oxide prepared by the modified Hummus method and obtained by ordinary drying was formulated into a 0.6 mg / mL homogeneous graphene oxide solution, and then KOH solution was added to adjust the pH to about 7.2. Put 30mL graphene oxide solution and a piece of pretreated nickel foam into a 50mL polytetrafluoro reactor for hydrothermal reaction, the reaction temperature is 180°C, and the reaction time is 36h. The obtained product was repeatedly washed with deionized water, and dried in a vacuum oven at 60° C. for 10 h.

[0050] (3) Preparation of foamed nickel / 3D-graphene / Ni-Co-S composite electrode

[0051] Prepare 100mL mixed solution according to the volume ratio of water and ethanol at a ratio of 3:1, then add...

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Abstract

The invention discloses a 3D-graphene / foam nickel, a preparation method thereof and an application thereof. A graphene oxide aqueous solution and foamed nickel are subjected to hydrothermal reaction at a temperature of 170 DEG C to 180 DEG C and then are cooled to a room temperature of 20 DEG C to 25 DEG C, the 3D-graphene / foam nickel is produced, the prepared 3D-graphene / foam nickel has the advantages of large specific surface area, multi-stage pore structure and excellent electrical conductivity, a large contact surface area of an electrode material and electrolyte contact specific surfacearea and a pore structure which facilitates the rapid transportation of ions and electrons can be provided, and therefore, good electrochemical performance is shown.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a 3D-graphene / nickel foam and its preparation method and application. Background technique [0002] Supercapacitor is a new type of energy storage device between rechargeable batteries and traditional capacitors. Its mass specific capacitance can reach hundreds or even thousands of farads. It also has many advantages that batteries and traditional capacitors do not have, including high current charging. Good discharge and cycle stability, high specific energy, environmental protection and no pollution. Therefore, supercapacitors have broad application prospects in communications, information, aviation, national defense, and electric vehicles. [0003] Supercapacitors are mainly composed of four parts: electrode materials, electrolytes, current collectors, and separators. The structural design of electrode materials is an important factor that determines the electrochemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/26H01G11/86
CPCH01G11/26H01G11/30H01G11/86Y02E60/13
Inventor 苏冬苗培霜桑志远张峰瑞
Owner TIANJIN UNIV
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