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Graphene-CoNi2S4 nano composite material for supercapacitor and preparation method of graphene-CoNi2S4 nano composite material

A technology of nanocomposite materials and supercapacitors, which is applied in the direction of hybrid capacitor electrodes, etc.

Inactive Publication Date: 2020-07-07
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, in terms of surface modification of graphene, it is still a challenge to achieve highly dispersed nanoparticles on the surface of graphene.

Method used

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  • Graphene-CoNi2S4 nano composite material for supercapacitor and preparation method of graphene-CoNi2S4 nano composite material
  • Graphene-CoNi2S4 nano composite material for supercapacitor and preparation method of graphene-CoNi2S4 nano composite material
  • Graphene-CoNi2S4 nano composite material for supercapacitor and preparation method of graphene-CoNi2S4 nano composite material

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Experimental program
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Effect test

Embodiment 1

[0026] Graphite oxide was prepared in advance using improved Hummers, and then 25 mg of graphite oxide was weighed, and 20 mL of deionized water was added to ultrasonic vibration for 2 hours; a certain amount of nickel nitrate was weighed 0.5 mmol, cobalt nitrate 1 mmol, thioacetamide 5 mmol, Add 20 mL of ethanolamine solution, stir for 30 minutes to dissolve; then mix the above aqueous solution and ethanolamine solution evenly, put it into a 50 mL autoclave with a polytetrafluoroethylene liner, seal it, and keep the temperature at 180°C for 16 hours. Distilled water and absolute ethanol were washed 3 times each, and vacuum-dried at 80°C for 10 hours to obtain graphene-CoNi 2 S 4 nanocomposites;

[0027] figure 1 For the XRD spectrum of the nanomaterial obtained in this embodiment, the diffraction peaks in the figure correspond well to CoNi 2 S 4 The diffraction peaks of the spectrum are consistent, proving that the product of the invention is a single CoNi 2 S 4 . figur...

Embodiment 2

[0029] Weigh 30 mg of graphite oxide, add 10 mL of deionized water and ultrasonically shake for 2 hours; weigh a certain amount of 1 mmol of nickel nitrate, 2 mmol of cobalt nitrate, and 10 mmol of thiourea, add it to 30 mL of diethanolamine solution, stir for 40 minutes to dissolve ; Then mix the above aqueous solution and ethanolamine solution evenly, put it into a 50 mL autoclave with a polytetrafluoroethylene liner and seal it, keep the temperature at 200°C for 14 hours, wash the product 3 times with distilled water and absolute ethanol, and heat it at 80°C Vacuum drying for 10 hours to obtain graphene-CoNi 2 S 4 nanocomposites. Under the same test conditions, it has good stability under the test conditions of increasing current density. When the current density is 1 A / g, its specific capacity can reach 1778 F / g; when the current density increases to 32A / g , its specific capacity can still reach 853 F / g. Under the current density of 5A / g, 10,000 constant current charge ...

Embodiment 3

[0031] Weigh 35 mg of graphite oxide, add 25 mL of deionized water and ultrasonically shake for 2 hours; weigh a certain amount of nickel chloride 2 mmol, cobalt chloride 4 mmol, and thiourea 15 mmol, add it to 15 mL of triethanolamine solution, and stir for 60 Dissolve in minutes; then mix the above aqueous solution and ethanolamine solution evenly, put it into a 50 mL autoclave with a polytetrafluoroethylene liner and seal it, keep the temperature at 210°C for 10 hours, wash the product three times with distilled water and absolute ethanol, Vacuum drying at 80°C for 12 hours to obtain graphene-CoNi 2 S 4 nanocomposites. Under the same test conditions, it has good stability under the test conditions of increasing current density. When the current density is 1 A / g, its specific capacity can reach 1822 F / g; when the current density increases to 32A / g , its specific capacity can still reach 924 F / g. Under the current density of 5A / g, 10,000 constant current charge and dischar...

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Abstract

The invention discloses a graphene-CoNi2S4 nano composite material for a supercapacitor and a preparation method of the graphene-CoNi2S4 nano composite material. The preparation method comprises the steps of taking cobalt salt, nickel salt and sulfur salt as raw materials, taking a mixture of alkylol amine and water as a solvent, putting the raw materials into a high-pressure kettle, reacting for5-25 hours at the temperature of 140-220 DEG C, performing suction filtration, and drying to obtain the nano composite material with monodisperse CoNi2S4 nano particles with the diameter of about 7-30nm uniformly and compactly growing on the surface of graphene. The preparation method has the characteristics that the operation method is simple, the yield is high, the CoNi2S4 nanoparticles selectively grow on the surface of graphene, and the electrochemical performance is excellent. The prepared CoNi2S4 nano particles and graphene integrate the common advantages of CoNi2S4 and graphene, and arehigh in conductivity, good in dispersity, not prone to agglomeration, high in mechanical strength and high in electrochemical activity. Therefore, the material is expected to be widely applied to thefields of supercapacitors, catalysis, lithium batteries and the like.

Description

technical field [0001] The invention relates to a graphene-CoNi2S4 nanocomposite material for a supercapacitor and a preparation method thereof, belonging to the field of inorganic non-metallic materials. Background technique [0002] Capacitor energy storage mainly stores energy in the form of an enriched charge potential field between the capacitor and the plates. This method can ensure that the capacitor is charged and discharged with a large current, and the energy storage / release process can be completed in a very short time. Compared with traditional batteries, capacitors have the advantages of fast charging and discharging speed, high power density, long cycle life, good reversibility and low cost, and will replace traditional batteries in some fields. It can be seen that supercapacitors have become an upsurge in the research of new energy storage devices. In order to obtain high-performance energy storage capacitors, in recent years, people have focused on preparing...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32
CPCH01G11/30H01G11/32Y02E60/13
Inventor 周军高强立肖元化张爱勤苏当成梁啟炜薛海青林圣城
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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