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Grapheme-based composite film using bacterium as template and preparation method and application thereof

A composite film, graphene-based technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of low power density, poor mechanical properties of asymmetric electrochemical capacitors, poor mechanical properties, etc., to increase the contact area, excellent Cycle stability, low cost effect

Active Publication Date: 2015-02-04
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nitrogen-doped porous carbon material prepared by this method has rich pore structure, large specific surface area and abundant nitrogen heteroatoms, and has good electrocatalytic reduction ability and excellent charge storage performance. However, it uses microorganisms as carbon Precursor, low power density, when used in supercapacitor materials, binders and conductive agents still need to be added
[0008] CN102924755A discloses a preparation method of graphene / bacterial cellulose composite material, which is formed by in-situ co-cultivation of bacterial cellulose and graphene, wherein graphene grows uniformly in the network fiber structure of bacterial cellulose, and the composite material Among them, graphene is evenly distributed on the bacterial cellulose fiber, which effectively suppresses the disadvantage that graphene particles are easy to agglomerate. However, the asymmetric electrochemical capacitor made of bacterial cellulose still needs to add a binder. and conductive agent, poor mechanical properties
This method uses bacterial cellulose as the electrode raw material, and the mechanical properties of the asymmetric electrochemical capacitor are still poor.

Method used

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  • Grapheme-based composite film using bacterium as template and preparation method and application thereof
  • Grapheme-based composite film using bacterium as template and preparation method and application thereof
  • Grapheme-based composite film using bacterium as template and preparation method and application thereof

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Effect test

Embodiment 1

[0052] Take 30mL of Bacillus subtilis aqueous solution (OD 600nm 2.0) with 20mL MnSO 4 (50mM) and Na 2 SO 4 (50mM) mixed solution was stirred and reacted at room temperature for 10h, then centrifuged and washed with deionized water; the product was dispersed in 10mL graphene oxide solution (2.0mg / mL), oscillated evenly, and the homogeneous mixed solution was vacuum filtered , the filter cake was peeled off from the filter membrane, dried naturally, and then annealed at 500°C for 5h under argon atmosphere to obtain graphene / MnO x Composite film.

[0053] The resulting composite film was cut into The wafers can be directly used as supercapacitor electrode materials without any binder and conductive agent. Select two pieces of similar quality as the electrode material, glass fiber membrane as the diaphragm, 1M NaSO 4 Using aqueous solution as the electrolyte, a two-electrode supercapacitor was assembled with a Swagelok cell, and its electrochemical performance was tested o...

Embodiment 2

[0059] Take 30mL of Bacillus subtilis aqueous solution (OD 600nm 2.0) with 20mL MnSO 4 (20mM) and Na 2 SO 4 (20 mM) the mixed solution was stirred and reacted for 5 h in the dark, then centrifuged, and the obtained product was washed with deionized water. Disperse the product in 10 mL of graphene oxide solution (2.0 mg / mL), vacuum filter the homogeneous mixture, peel off the filter cake from the filter membrane, dry it naturally, and then anneal at 500 °C for 5 h under an argon atmosphere. Graphene / MnO x Composite film.

[0060] The resulting composite film was cut into The wafers can be directly used as supercapacitor electrode materials without any binder and conductive agent. Select two pieces of similar quality as the electrode material, glass fiber membrane as the diaphragm, 1M NaSO 4 The aqueous solution was used as the electrolyte, and a two-electrode supercapacitor was assembled with a Swagelok cell, and its electrochemical performance was tested on the two-ele...

Embodiment 3

[0062] Take 30mL of micrococcus aqueous solution (OD 600nm 2.0) with 30mL Mn(NO 3 ) 2 (50mM) and NaNO 3 (50 mM) the mixed solution was stirred and reacted for 10 h under dark conditions, then centrifuged, and the obtained product was washed with deionized water. Disperse the product in 10 mL of graphene oxide solution (2.0 mg / mL), vacuum filter the homogeneous mixture, peel off the filter cake from the filter membrane, dry it naturally, and then anneal at 500 °C for 5 h under an argon atmosphere. Graphene / MnO x Composite film.

[0063] The resulting composite film was cut into The wafers can be directly used as supercapacitor electrode materials without any binder and conductive agent. Select two pieces of similar quality as the electrode material, glass fiber membrane as the diaphragm, 1M NaSO 4 The aqueous solution was used as the electrolyte, and a two-electrode supercapacitor was assembled with a Swagelok cell, and its electrochemical performance was tested on the ...

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Abstract

The invention relates to a grapheme-based composite film using bacterium as a template and a preparation method and application thereof. The method comprises the following steps: attaching Mn<2+> particles to a cell wall under the static effect by using bacterium as a soft template material in a room temperature agitating condition; uniformly mixing with grapheme; performing vacuum filtration to obtain a self-supporting film; then performing biomineralization to btain high-conductivity porous grapheme / MnOx composite film material. The bacterium template guided grapheme-based composite film is used as a self-supporting electrode material without any adhesive and conductive agent and can be applied to a super capacitor to greatly prolong the cycle service life and improve the capacitance performance of the super capacitor.

Description

technical field [0001] The invention belongs to the field of nanomaterials and electrochemistry, and specifically relates to a graphene-based composite film and its preparation method and application, in particular to a graphene-based composite film using bacteria as a template, its preparation method and application. Background technique [0002] Due to the depletion of fossil fuels and the increasingly prominent energy and environmental issues, the research and development of new energy conversion and storage devices has attracted much attention. Supercapacitor, a new type of clean energy between traditional capacitors and lithium-ion batteries, has the characteristics of high specific capacitance, wide potential window, high energy density, long cycle life, and light weight. The combination of supercapacitors and traditional batteries can provide electric The car provides plenty of power. [0003] The performance of supercapacitors mainly depends on the performance of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/38H01G11/44H01G11/86
CPCY02E60/13H01G11/24H01G11/30H01G11/36H01G11/46H01G11/86
Inventor 郭王欢江鹏
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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