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Preparation and application of MnO2-SnO2/graphite nanometer array composite electrode material

A technology of graphite nanosheets and composite electrodes, which is applied in the fields of hybrid capacitor electrodes, electrolytic inorganic material coating, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as no detailed reports.

Inactive Publication Date: 2015-04-08
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal oxide nanomaterials wrapped in MnO 2 The resulting composite material has a high specific surface area and high electrical conductivity, so that the composite material has a higher specific surface area than pure MnO 2 More excellent electrochemical performance, but the nano-SnO 2 nicely wrapped in MnO 2 The thin film exhibits excellent electrochemical performance, and the process of assembling a symmetrical supercapacitor with the composite electrode prepared by this method has not been reported in detail.

Method used

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  • Preparation and application of MnO2-SnO2/graphite nanometer array composite electrode material
  • Preparation and application of MnO2-SnO2/graphite nanometer array composite electrode material
  • Preparation and application of MnO2-SnO2/graphite nanometer array composite electrode material

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Experimental program
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Embodiment 1

[0035] (1) Preparation of graphite nanosheet array substrate GNSA; the graphite rod was polished until the bottom surface was smooth, and after repeated ultrasonic cleaning with water, placed in 6~10mol L -1 Etched in the HCl solution for 30~50min; repeated ultrasonic cleaning with acetone and water, and dried. Configure 0.02mol·L -1 Sodium dodecylbenzene sulfonate (SDBS) was used as the electrolyte solution. Two graphite rods were placed in parallel in the electrolyte solution, and then a constant potential of 3V was applied to the two electrodes. A GNSA array was formed at the interface of the electrolyte solution; after soaking the GNSA in acetone for 24 hours, the electrode surface was taken out and washed repeatedly with high-purity water, and finally dried in an air atmosphere at 30-50°C to obtain the graphite nanosheet array substrate GNSA.

[0036] (2) MnO 2 -SnO 2 Preparation of / GNSA composite electrode: GNSA was used as the working electrode, platinum mesh and s...

Embodiment 2

[0042] (1) Preparation of graphite nanosheet array substrate GNSA; the graphite rod was polished until the bottom surface was smooth, and after repeated ultrasonic cleaning with water, placed in 7mol L -1 etched in hydrochloric acid solution for 30min; repeated ultrasonic cleaning with acetone and water, and dried. Configure 0.03mol·L -1 Sodium dodecylbenzenesulfonate (SDBS) was used as the electrolyte solution, and the cleaned two graphite rods were placed in the electrolyte solution in parallel, and then a constant positive potential of 1V was applied to the two electrodes. A GNSA array was formed at the interface of the solution; after soaking the GNSA in acetone for 24 hours, the electrode surface was taken out and repeatedly rinsed with high-purity water, and finally dried in an air atmosphere at 35°C to obtain the graphite nanosheet array substrate GNSA.

[0043] (2) MnO 2 -SnO 2 Preparation of / GNSA composite electrode: GNSA was used as the working electrode, platin...

Embodiment 3

[0049] (1) Preparation of graphite nanosheet array substrate GNSA; the graphite rod was polished until the bottom surface was smooth, and after repeated ultrasonic cleaning with water, placed in 10mol·L -1 etched in hydrochloric acid solution for 30min; repeated ultrasonic cleaning with acetone and water, and dried. Configuration 0.06mol L -1 Sodium dodecylbenzenesulfonate (SDBS) was used as the electrolyte solution, and the cleaned two graphite rods were placed in the electrolyte solution in parallel, and then a constant positive potential of 8V was applied to the two electrodes. A GNSA array is formed at the solution interface; soak the GNSA in acetone for 48 hours, take it out and rinse the electrode surface repeatedly with high-purity water, and finally dry it in an air atmosphere at 50°C to obtain the graphite nanosheet array substrate GNSA.

[0050] (2) MnO 2 -SnO 2 Preparation of / GNSA composite electrode: GNSA was used as the working electrode, platinum mesh and sa...

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Abstract

The invention discloses a preparation method of an MnO2-SnO2 / graphite nanometer array composite electrode material. With an electrochemically activated and stripped graphite nanometer array as a base, and a mixed liquid of MnCl2.4H2O, NaNO3 and SnCl4.5H2O as an electroplate liquid, reduced electrodeposition of MnO2-SnO2 on the surface of the graphite nanometer array is carried out by using a constant potential method, so as to obtain the MnO2-SnO2 / graphite nanometer array composite electrode material. An electrochemical test shows that the composite electrode has excellent super-capacitive property; and the specific capacitance reaches 4245F.m<-2>. According to a symmetrical supercapacitor assembled by the MnO2-SnO2 / GNSAs composite electrode and the same electrolyte, the energy density reaches 0.43Wh.m<-2>; and the specific capacitance can still be kept at 70% of initial specific capacitance after circulating 4000 circles.

Description

technical field [0001] The present invention relates to a kind of MnO 2 -SnO 2 The invention relates to the preparation of composite electrode materials of graphite nano sheet arrays, belonging to the technical field of composite materials. The present invention also relates to the MnO 2 -SnO 2 / Application of graphite nanosheet array composite electrode materials in the assembly of symmetric supercapacitors. technical background [0002] Electrochemical technology is an important method for preparing nanomaterials. Compared with compounds, bulk materials or macroscopic materials with layered microstructures prepared by other methods (such as hydrothermal method, self-assembly technology, etc.), electrochemistry When the electrode is prepared by chemical technology, the electrode material is deposited on the surface of the collector to form a deposited layer with a unique high density and low porosity, and the thickness of the deposited layer, the size of the grain and t...

Claims

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Application Information

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IPC IPC(8): C25D9/04H01G11/86H01G11/30H01G11/46H01G11/24
CPCY02E60/13
Inventor 胡中爱陈婵娟任小英强睿斌胡海雄吴红英
Owner NORTHWEST NORMAL UNIVERSITY
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