Preparation method of hollow CoMn2O4-RGO flexible super capacitor material

A technology of flexible materials and electrical materials, applied in the field of supercapacitors, can solve the problems of unfavorable electrolyte transmission, easy dense accumulation, electrochemical performance attenuation, etc., and achieve the effect of improving electrochemical performance and facilitating penetration and transfer

Active Publication Date: 2017-06-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of van der Waals force in the middle of the graphene sheets, dense accumulation is prone to occur during the preparation process and the electrochemical reaction process, which is not conducive to the transmission of the electrolyte, resulting in rapid degradation of electrochemical performance.

Method used

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  • Preparation method of hollow CoMn2O4-RGO flexible super capacitor material
  • Preparation method of hollow CoMn2O4-RGO flexible super capacitor material
  • Preparation method of hollow CoMn2O4-RGO flexible super capacitor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Hollow CoMn 2 o 4 - Preparation of RGO flexible material

[0023] 0.125 mmol of Co(NO 3 ) 2 ·6H 2 O and 0.25 mmol Mn(NO 3 ) 2 4H 2 O was dissolved in 40 ml of isopropanol, 8 ml of glycerol was added to the above solution and stirred for 30 minutes; subsequently, the resulting mixture was transferred to a 100 ml stainless steel autoclave, and reacted at 180°C for 6 hours. The obtained precipitate (Co—Mn precursor) was collected by centrifugation, washed 6 times with absolute ethanol, and dried at 60° C. for 12 hours. Finally, the obtained Co-Mn precursor was calcined in a muffle furnace at 400 °C for 2 hours, and the heating rate was 1 °C / min, and finally CoMn was obtained. 2 o 4 Hollow ball material. Graphene oxide (GO) was prepared by the Hummer method. The prepared CoMn 2 o 4 and GO powder were prepared into solutions with a concentration of 0.5 mg / ml and 0.2 mg / ml respectively, and a certain amount (CoMn 2 o 4 and GO at a mass ratio of 1:2, 1...

Embodiment 2

[0024] Example 2 Hollow CoMn 2 o 4 -Characterization analysis of RGO flexible materials

[0025] Such as figure 1 As can be seen from the figure, CoMn 2 o 4 and the characteristic peaks of RGO appear in CoMn 2 o 4 -RGO composites, and with the increase of the amount of RGO, the characteristic peaks of RGO are gradually enhanced.

[0026] figure 2 It can be observed that CoMn 2 o 4 It exhibits a spherical structure between 400-500nm, and the sphere is a hollow structure.

[0027] image 3 a-b show CoMn2 o 4 mixed with RGO and coated together, image 3 c–d show a sandwich-like structure, illustrating the hollow-shell structure of CoMn 2 o 4 The ball successfully propped up the layered structure of the RGO sheet.

[0028] Figure 4 It can be seen from the XPS figure that there are Mn, Co, O, and C elements.

[0029] Figure 5 It can be observed that the mass ratio of CoMn 2 o 4 : In the case of RGO=1:4, hollow core-shell CoMn 2 o 4 -RGO flexible material ha...

Embodiment 3

[0031] Example 3 Hollow CoMn 2 o 4 -Electrochemical experiment of RGO flexible material

[0032] (1) The prepared CoMn 2 o 4 - The RGO film was cut into a square with an area of ​​one square centimeter, and it was sandwiched between two nickel foams of the same size as the working electrode.

[0033] (2) The prepared working electrode, silver / silver chloride electrode, and platinum sheet electrode were electrochemically tested in 6 mol / liter KOH electrolyte.

[0034] (3) The prepared hollow core-shell CoMn 2 o 4 -RGO flexible material at 1Ag -1 The specific capacity at the current density reaches 992.9F g -1 .

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Abstract

The present invention relates to the super capacitor technology field, in particular to a method which uses the manganese nitrate tetrahydrate, the cobaltous nitrate hexahydrate, the glycerinum, the isopropyl alcohol and the graphene oxide as the raw materials to prepare the hollow CoMn2O4-RGO flexible super capacitor material, and is simple in preparation technology and low in cost. According to the present invention, by adopting the CoMn2O4 and GO materials of the hollow core-shell structures and by a vacuum filtration method, a CoMn2O4-RGO sandwich structure composite material is prepared for the first time, on one hand, the CoMn2O4 of the hollow core-shell structure has a larger specific area, and the hollow structure is more conducive to the permeation and transfer of an electrolyte; and on the other hand, a CoMn2O4 spherical structure also can support the intervals between the graphene layers, a channel for the flow of the electrolyte is provided, and the flow of the electrolyte in the interior of the material also can be accelerated. By the structure, the electrochemical performance of the material can be improved effectively.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a Mn(NO 3 ) 2 4H 2 O, Co(NO 3 ) 2 ·6H 2 O, glycerol, isopropanol and graphene oxide as raw materials to prepare hollow CoMn 2 o 4 -RGO flexible superelectric material is a method with simple preparation process and low cost. Background technique [0002] With the development of science and technology, people have put forward higher requirements for portable electronic products, especially with the launch of flexible smart phones, bendable thin film electrode materials have also attracted more and more attention. Graphene is carbon atoms with sp 2 A hexagonal grid planar film composed of hybrid orbitals, a two-dimensional material with a single-layer sheet-like thickness of only one carbon atom. Therefore, it has excellent electrical conductivity and mechanical properties, and is a very potential flexible electrode material. However, due to the existence of van d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/24H01G11/36B82Y30/00
CPCY02E60/13H01G11/86B82Y30/00H01G11/24H01G11/36H01G11/46
Inventor 严铭施伟东
Owner JIANGSU UNIV
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