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A new method for preparing graphene/nickel oxide composites

A composite material and graphene technology, applied in electrolytic inorganic material coating, hybrid capacitor electrode and other directions, can solve the problems of complex process, easy agglomeration of graphene, etc., achieve good application prospects, solve easy agglomeration, and low cost.

Active Publication Date: 2022-03-15
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the complex process and easy agglomeration of graphene in the preparation of graphene-based electrode materials in the prior art, the purpose of the present invention is to provide a new method for preparing graphene / nickel oxide composite materials, specifically a copper rod A method for assisting cathode plasma electrolysis to prepare graphene / nickel oxide composite electrode materials. The method is simple in process and can prepare uniform, continuous and dense nickel oxide on the surface of graphene. The prepared graphene / nickel oxide composite electrode material has high Specific capacitance

Method used

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  • A new method for preparing graphene/nickel oxide composites
  • A new method for preparing graphene/nickel oxide composites
  • A new method for preparing graphene/nickel oxide composites

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Embodiment 1

[0041] The specific steps for preparing graphene / nickel oxide composite electrode materials by cathode plasma electrolysis assisted by copper rods are as follows:

[0042] (1) Dissolve nickel nitrate in deionized water to prepare an electrolyte solution with a concentration of 5 g / L; weigh a certain amount of graphene, add it to the prepared electrolyte solution, and ultrasonicate in an ultrasonic cleaner for 30 minutes to obtain graphite Graphene / nickel nitrate mixed solution that olefin concentration is 25mg / L, for subsequent use;

[0043] (2) Immerse the high-purity graphite plate as the anode electrode and the ring-shaped copper rod as the cathode electrode in the graphene / nickel nitrate mixture, connect the cathode electrode and the anode electrode to the high-frequency DC power supply respectively, and turn on the high-frequency DC power supply for 60 s , apply a voltage of 220 V to the cathode and anode to form a stable plasma arc area;

[0044] (3) Suction filter and ...

Embodiment 2

[0053] The specific steps for preparing graphene-based electrode materials by cathode plasma electrolysis assisted by copper rods are as follows:

[0054] (1) Dissolve nickel sulfate in deionized water to prepare an electrolyte solution with a concentration of 10 g / L; weigh a certain amount of graphene, add it to the prepared electrolyte solution, and ultrasonically ultrasonicate for 30 min in an ultrasonic cleaner to obtain graphite Graphene / nickel sulfate mixed solution that olefin concentration is 35mg / L, for subsequent use;

[0055] (2) Immerse the high-purity graphite plate as the anode electrode and the ring-shaped copper rod as the cathode electrode in the graphene / nickel sulfate mixture, connect the cathode electrode and the anode electrode to the high-frequency DC power supply respectively, and turn on the high-frequency DC power supply for 90 s Apply a voltage of 160 V to the cathode and anode to form a stable plasma arc;

[0056] (3) Suction filter and dry the modi...

Embodiment 3

[0063] The specific steps for preparing graphene-based electrode materials by cathode plasma electrolysis assisted by copper rods are as follows:

[0064] (1) Dissolve nickel chloride in deionized water to prepare an electrolyte solution with a concentration of 20 g / L; weigh a certain amount of graphene, add it to the prepared electrolyte solution, and ultrasonically ultrasonicate for 30 min in an ultrasonic cleaner to obtain Graphene concentration is the graphene / nickel chloride mixed solution of 50mg / L, for subsequent use;

[0065] (2) Immerse the high-purity graphite plate as the anode electrode and the ring-shaped copper rod as the cathode electrode in the graphene / nickel chloride mixture, connect the cathode electrode and the anode electrode to the high-frequency DC power supply respectively, and turn on the high-frequency DC power supply 120 s Apply a voltage of 100 V to the cathode and anode to form a stable plasma arc;

[0066] (3) Suction filter and dry the modified ...

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Abstract

The present invention provides a new method for preparing graphene / nickel oxide composite material. The method for preparing a graphene / nickel oxide composite electrode material with high specific capacitance, specifically, is to use a copper rod-assisted cathode plasma electrolysis technique to realize that the graphene surface is coated with a layer of uniform, continuous and dense nickel oxide, which is effective. Solve the problem that graphene is easy to agglomerate when preparing electrode materials. This technology makes up for the shortcomings of current methods for preparing graphene electrode materials. This method can not only effectively solve the problem of easy agglomeration of graphene, but also coat a layer of uniform, continuous and dense nickel oxide on the surface of graphene; the method has high efficiency, Fast, low cost, environmental protection and other advantages.

Description

technical field [0001] The invention specifically relates to a new method for preparing a graphene / nickel oxide composite material, specifically a graphene / nickel oxide composite material with high specific capacitance, its preparation method and electrode application, and belongs to the technical field of supercapacitor materials. Background technique [0002] Graphene has become an ideal capacitor material due to its large specific surface area, high electronic conductivity, and good mechanical properties. The specific surface area and ionic conductivity decrease. At present, graphene-based electrodes are mainly prepared by modifying graphene or compounding with transition metal oxides to form graphene-based composite electrode materials, so as to improve the capacitance. [0003] Transition metal oxides with excellent pseudocapacitive properties exhibit high specific capacitance and energy density, such as RuO 2 , Fe 2 o 3 、Co 3 o 4 , NiO, CuO and Mn 2 o 3 etc. ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/08H01G11/24H01G11/30H01G11/36H01G11/46
CPCC25D9/08H01G11/24H01G11/30H01G11/36H01G11/46Y02E60/13
Inventor 张玉平魏弘历吴丹杜伟解秀波
Owner YANTAI UNIV
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