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Preparation and application of multi-shell CuCo2O4 hollow nanosphere

A hollow nano, cu-co technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of unstable structure, poor conductivity, fast decay in the charging and discharging process, etc., and reach the active site Multiple, mild and controllable reaction conditions, the effect of slowing down the collapse of the electrode material structure

Inactive Publication Date: 2019-05-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CuCo 2 o 4 As a kind of transition metal oxide, it is an oxide composed of two transition metals. It has higher activity than a single metal oxide, so it has a higher capacity, but its charge and discharge process decays too fast and its structure is not good. Stable, poor conductivity, limiting applications

Method used

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  • Preparation and application of multi-shell CuCo2O4 hollow nanosphere
  • Preparation and application of multi-shell CuCo2O4 hollow nanosphere
  • Preparation and application of multi-shell CuCo2O4 hollow nanosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1 mmol Co(NO3) 2 ·6H 2 O and 0.5 mmol of Cu(NO 3 ) 2 ·6H 2 O was dissolved in 33.5 ml of isopropanol, 6.5 ml of glycerol was added dropwise to the above solution and stirred for 30 minutes; subsequently, the resulting mixture was transferred to a 50 ml stainless steel autoclave, and reacted at 180°C for 2 hours. The obtained precipitate was collected by centrifugation, washed with absolute ethanol, and dried in an oven at 80° C. for 6 hours to obtain copper alkoxide. Finally, place the copper alkoxide in a muffle furnace for calcination at 300°C for 2 hours, with a heating rate of 2°C / min, and finally obtain CuCo 2 o 4 Hollow core-shell sphere material. CuCo 2 o 4 Powder, PVDF and acetylene black are uniformly mixed at a mass ratio of 8:1:1, and spread on the pretreated foamed nickel, and the mass of the active material is 2mg / cm 2 . The smeared nickel foam is used as an electrode to assemble a supercapacitor.

Embodiment 2

[0040] 1 mmol Co(NO3) 2 ·6H 2 O and 0.5 mmol of Cu(NO 3 ) 2 ·6H 2O was dissolved in 33.5 ml of isopropanol, 6.5 ml of glycerol was added dropwise to the above solution and stirred for 30 minutes; subsequently, the resulting mixture was transferred to a 50 ml stainless steel autoclave, and reacted at 160°C for 4 hours. The obtained precipitate was collected by centrifugation, washed with absolute ethanol, and dried in an oven at 80° C. for 6 hours to obtain copper alkoxide. Finally, place the copper alkoxide in a muffle furnace for calcination at 300°C for 2 hours, with a heating rate of 2°C / min, and finally obtain CuCo 2 o 4 Hollow double shell ball material. CuCo 2 o 4 Powder, PVDF and acetylene black are uniformly mixed at a mass ratio of 8:1:1, and spread on the pretreated foamed nickel, and the mass of the active material is 2mg / cm 2 . The smeared nickel foam is used as an electrode to assemble a supercapacitor.

Embodiment 3

[0042] 1 mmol Co(NO3) 2 ·6H 2 O and 0.5 mmol of Cu(NO 3 ) 2 ·6H 2 O was dissolved in 33.5 ml of isopropanol, 6.5 ml of glycerol was added dropwise to the above solution and stirred for 30 minutes; subsequently, the resulting mixture was transferred to a 50 ml stainless steel autoclave, and reacted at 170°C for 8 hours. The obtained precipitate was collected by centrifugation, washed with absolute ethanol, and dried in an oven at 80° C. for 6 hours to obtain copper alkoxide. Finally, place the copper alkoxide in a muffle furnace for calcination at 300°C for 2 hours, with a heating rate of 2°C / min, and finally obtain CuCo 2 o 4 Hollow three-shell ball material. CuCo 2 o 4 Powder, PVDF and acetylene black are uniformly mixed at a mass ratio of 8:1:1, and spread on the pretreated foamed nickel, and the mass of the active material is 2mg / cm 2 . The smeared nickel foam is used as an electrode to assemble a supercapacitor.

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Abstract

The invention discloses preparation and application of a multi-shell CuCo2O4 hollow nanosphere. The preparation comprises the following steps: firstly preparing a copper alkoxide hollow nanosphere inone step by utilizing a hydrothermal process and taking the prepared copper alkoxide hollow nanosphere as a precursor; regulating and controlling hydrothermal reaction time, so that core-shell, double-shell and three-shell precursors can be obtained; and then sintering the precursors in the air to obtain CuCo2O4 of a hollow structure. The prepared CuCo2O4 hollow nanosphere has the characteristicsof high specific surface area, regulatable shell number and abundant active sites, so that specific capacity of a supercapacitor is effectively improved. Besides, a stable shell and cavity structure can effectively alleviate collapse of an electrode material structure in charging and discharging processes of the supercapacitor, and then cycling stability of the supercapacitor is obviously improved. The preparation method is simple to operate, has good repeatability and is easy for large scale production.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a multi-shell CuCo 2 o 4 Preparation and application of hollow nanospheres. Background technique [0002] With the continuous growth of energy demand, while human beings are constantly developing various new energy sources, it is particularly important how to store and convert these energy sources more efficiently, at low cost, and in an environmentally friendly manner. In recent years, lithium-ion batteries and supercapacitors have been considered as very potential power sources for electric vehicles and mobile devices because of their advantages of high energy, high power, high efficiency, and environmental friendliness. For energy storage devices, the key is the electrode material. Therefore, the design and development of electrode materials with excellent performance has become an urgent problem for researchers to solve. [0003] Based on their excellent physical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/86
CPCY02E60/13
Inventor 王育乔李高锋孙岳明
Owner SOUTHEAST UNIV
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