Preparation method of electrode material of silver/graphene thin film supercapacitor

A graphene film and supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, capacitors, electrolytic capacitors, etc., can solve the reports, physical and chemical properties that have not yet been seen in the preparation of silver/graphene film supercapacitor electrode materials Loss and other problems, to achieve the effect of superior supercapacitor performance, promotion of charge transfer, and high specific capacitance

Inactive Publication Date: 2012-07-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the graphite oxide reduction method commonly used to prepare graphene now has oxygen-containing functional groups remaining on the surface of graphene, resulting in the loss of some physical and chemical properties, especially the electrical conductivity, which has a great impact on the application of graphene in supercapacitors. influences
[0004] There is no report on the preparation of silver / graphene film supercapacitor electrode materials

Method used

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  • Preparation method of electrode material of silver/graphene thin film supercapacitor
  • Preparation method of electrode material of silver/graphene thin film supercapacitor
  • Preparation method of electrode material of silver/graphene thin film supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0028] Weigh 0.025g of graphite oxide and disperse into 100mL of ultrapure water for ultrasonic dispersion for 1h, add 0.025g of silver nitrate and magnetically stir and mix for 30min, then add 0.04g of sodium borohydride and continue stirring for 2h to obtain a bright brown solution. Add the above solution into a three-necked flask, add 2.5g of sodium borohydride again, raise the temperature to 80°C under a nitrogen protective atmosphere, and keep it warm for 1 hour to obtain a black suspension. The centrifugation speed is 6500r / min and the time is 15min. Ultrapure water After centrifugation and washing for 6 times, the film-like product was obtained by suction filtration, and washed 5 times with ultrapure water.

[0029] figure 1 For the comparison of the X-ray diffraction curves of the product and pure graphene, the steamed bread peaks of graphene appear in the figure, and several strong diffraction peaks match the PDF standard card 65-2871 of silver, indicating that the gr...

Embodiment 2

[0035] Weigh 0.025g of graphite oxide and disperse it into 50mL of ultrapure water for 2 hours, add 0.005g of silver nitrate and stir for 60 minutes, then add 0.025g of sodium borohydride and continue to stir for 1 hour to obtain a bright brown liquid. The liquid was added into a three-necked flask, and 1.25 g of sodium borohydride was added again. Under a nitrogen protective atmosphere, the temperature was raised to 70° C. and kept for 3 hours to obtain a black liquid. The centrifugation speed is 9000r / min and the time is 5min, and the ultrapure water is centrifuged and washed 10 times, and then the film-like product is obtained by suction filtration, which can be washed 10 times with ultrapure water. X-ray diffraction analysis shows that it is a silver / graphene composite component, impedance analysis shows that the charge transfer resistance is low, cyclic voltammetry curve analysis has high specific capacitance performance, and constant current charge and discharge analysis ...

Embodiment 3

[0037] Weigh 0.025g of graphite oxide and disperse it into 80mL of ultrapure water and sonicate for 1.5h, add 0.02g of silver nitrate with magnetic stirring and mix for 30min, then add 0.05g of sodium borohydride and continue stirring for 3h to obtain a bright brown liquid. The liquid was added into a three-necked flask, and 1.5 g of sodium borohydride was added again. Under a nitrogen protective atmosphere, the temperature was raised to 85° C. and kept for 1 hour to obtain a black liquid. The centrifugation speed is 8000r / min and the time is 10min, and the ultrapure water is centrifuged and washed 5 times, and then the film-like product is obtained by suction filtration, and the ultrapure water is washed 7 times. X-ray diffraction analysis shows that it is a silver / graphene composite component, impedance analysis shows that the charge transfer resistance is low, cyclic voltammetry curve analysis has high specific capacitance performance, and constant current charge and dischar...

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Abstract

The invention relates to a preparation method of an electrode material of a silver/graphene thin film supercapacitor, which comprises the steps: (1) dispersing oxidized graphite into ultrapure water at room temperature, adding silver nitrate after performing ultrasound, agitating and mixing the mixture and then adding sodium borohydride, and continuously agitating the mixture to obtain a partially reduced silver/oxidized graphite dispersion, wherein the mass ratio of sodium borohydride to oxidized graphite is 2:1-1:1; and (2) adding sodium borohydride into the partially reduced silver/oxidized graphite dispersion, raising temperature to 70-85 DEG C under nitrogen atmosphere, maintaining temperature for 1-3h, and performing centrifugal washing to obtain a silver/graphene dispersion; filtering the silver/graphene dispersion to form a film-like product; and washing the product with ultrapure water to obtain the electrode material of the silver/graphene thin film supercapacitor. The preparation method is simple and the film forming process is free from a conducting additive and a bonder, so that the preparation method is appropriate for industrialized production. The electrode material of the silver/graphene thin film supercapacitor obtained by the invention has high specific capacitance and good conducting performance, higher flexibility and wide application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of supercapacitor materials, in particular to a method for preparing silver / graphene film supercapacitor electrode materials. Background technique [0002] Graphene is a new type of material that can be obtained by reducing graphite oxide. Since the discovery of graphene by the research team of Novoselov and Geim at the University of Manchester in 2004, graphene has rapidly become a hot topic in physics, chemistry and materials science, setting off an upsurge of researchers studying its properties and applications. Recently, researchers at Columbia University in the United States discovered that graphene is the strongest and thinnest material among known materials in the world. In terms of conductivity, graphene is a zero-bandgap semiconductor, and its stable lattice structure makes carbon atoms have excellent conductivity, in which the movement speed of electrons reaches 1 / 300 of the speed of light, f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01G9/058H01G11/86
CPCY02E60/13
Inventor 李耀刚邵元龙王宏志张青红
Owner DONGHUA UNIV
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