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Porous grapheme/ MnO2 composite film and preparation method and application thereof

A technology of porous graphene and composite film, applied in the manufacture of hybrid/electric double-layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of increasing the quality and cost of supercapacitors, low effective specific surface area, and reduced effective area, etc. The supercapacitor has good performance, good cycle stability, and the effect of increasing the contact area

Active Publication Date: 2014-07-02
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-dimensional graphene paper is an ideal integral and self-supporting supercapacitor electrode material due to its good conductivity and high specific surface area. However, in practical applications, the accumulation of graphene sheets makes the formation of double electric The effective area of ​​the layer is reduced
The graphene / polyaniline nanofiber composite material prepared by this method is chemically bonded to polyaniline, thereby improving the capacitance performance and stability of the material, but due to the π-π stacking of graphene and the van der Waals force, its effective The specific surface area is still not high
And the prepared composite material is in a powder state, and additives are needed in the process of preparing supercapacitors, which greatly increases the quality and cost of supercapacitors

Method used

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  • Porous grapheme/ MnO2 composite film and preparation method and application thereof
  • Porous grapheme/ MnO2 composite film and preparation method and application thereof
  • Porous grapheme/ MnO2 composite film and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0044] refer to figure 1 , 100 mg of PS beads with an average diameter of about 300 nm were dispersed in 2 mg / mL of DA in Tris-HCl (pH = 8.5) solution, stirred at room temperature for 15 h, then centrifuged, washed, and dried to obtain PSPDA powder. Disperse the PSPDA powder into a 10mg / mL aqueous solution, take 0.25mL and 10mL graphene solution (1.25mg / mL) and ultrasonically disperse for 40min, then vacuum filter the mixture, dry it naturally and peel off the composite film from the filter membrane Down, get PSPDAGO composite film. The composite film was annealed at 500° C. for 5 h in an Ar atmosphere to remove the template PS pellets to obtain a hollow-structured graphene composite film. Put this film in 10mM potassium permanganate aqueous solution, and conduct a hydrothermal reaction at 180°C for 25min, as figure 2 Porous graphene / MnO shown 2 Composite film. Cut the composite membrane into discs with a diameter of 1 cm, select two pieces of similar mass as electrode ma...

Embodiment 2

[0051] refer to figure 1 , 100 mg of PS beads with an average diameter of about 300 nm were dispersed in 2 mg / mL of DA in Tris-HCl (pH = 8.5) solution, stirred at room temperature for 10 h, then centrifuged, washed, and dried to obtain PSPDA powder. Disperse the PSPDA powder into a 10mg / mL aqueous solution, take 0.25mL and 10mL graphene solution (1.25mg / mL) and ultrasonically disperse for 40min, then vacuum filter the mixture, dry it naturally and peel off the composite film from the filter membrane Down, get PSPDAGO composite film. The composite film was annealed at 500° C. for 5 h in an Ar atmosphere to remove the template PS pellets to obtain a hollow-structured graphene composite film. Put the film in 10mM potassium permanganate aqueous solution, and conduct a hydrothermal reaction at 180°C for 25min.

[0052] The specific capacitance of the material is calculated by constant current charge and discharge to be 75.2F / g (the current is 0.1A / g, and the electrochemical windo...

Embodiment 3

[0054] Disperse 100 mg of PS beads with an average diameter of about 300 nm in 0.5 M glucose solution, stir and react at room temperature for 24 hours, then centrifuge, wash, and dry to obtain polydextrose-coated PS powder. Disperse the above powder into a 10mg / ml aqueous solution, take 1mL of this solution and 10mL graphene solution (1.25mg / mL) and ultrasonically disperse for 40min, then vacuum filter the mixture, dry it naturally and remove the composite film from the filter membrane Peel it off to get the PSPGLGO composite film. The composite film was annealed at 500° C. for 5 h in an Ar atmosphere to remove the template PS pellets to obtain a hollow-structured graphene composite film. Put this film in 5mM potassium permanganate aqueous solution for hydrothermal reaction for 20min. Cut the composite membrane into discs with a diameter of 1 cm, select two pieces of similar mass as electrode materials, glass fiber membrane as a diaphragm, 1M Na 2 SO 4 The aqueous solution ...

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Abstract

The invention relates to a porous grapheme / MnO2 composite film and a preparation method and application thereof. The preparation method comprises the following steps of (1), providing a ball-shaped formwork and coating the surface of the ball-shaped formwork with a polymer layer; (2) providing graphene oxide solution, evenly mixing a small formwork ball coated with the polymer layer obtained in the step (1) with the graphene oxide solution, performing vacuum filtration, and stripping the composite film from a filter membrane after drying; (3) performing high temperature annealing on the composite film obtained in the step (2) to obtain a film of a porous structure; (4) putting the film obtained in the step (3) into potassium permanganate solution to perform hydrothermal reaction to obtain the porous grapheme / MnO2 composite film. No any binder or conductive agent is needed to be added to the porous composite film prepared by the method, and the porous composite film is good mechanical property and super capacitive performance, has the advantages of being good in high-rate charge and discharge performance, long in circle life and the like, and can be applied to preparing super-capacitors and improve performance of super-capacitors greatly.

Description

technical field [0001] The present invention relates to the field of preparation and application of graphene materials, more specifically, to a porous graphene / MnO 2 Composite film and its preparation method, as well as the use of this material in supercapacitors as a self-supporting electrode material without any binder and conductive agent. Background technique [0002] Graphene is a planar film composed of carbon atoms in a hexagonal honeycomb lattice with sp2 hybrid orbitals. It is a two-dimensional material with a thickness of carbon atoms. Graphene is not only the thinnest known material, but also very Strong and hard; as a single substance, it can transfer electrons faster than known conductors at room temperature. Graphene has extraordinary electrical conductivity, strength dozens of times stronger than steel, and excellent light transmission. [0003] Supercapacitor, that is, electrochemical capacitor, is a clean electric energy storage device that can provide high...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/26H01G11/36H01G11/46
CPCY02E60/13
Inventor 郭王欢江鹏刘腾蛟赵勇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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