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NiCo2O4@NiCo2O4 nanometer material for super capacitor electrode and preparation method thereof

A technology of supercapacitors and nanomaterials, applied in the fields of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology for materials and surface science, etc. , large size and other problems, to achieve the effect of improving space utilization, good cycle performance, area specific volume and mass specific volume

Active Publication Date: 2015-08-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] NiCo 2 o 4 Due to its excellent electrical conductivity and high mass specific capacity, it has become an electrode material widely studied at present. The nanostructure can provide a high specific surface area. At present, the nanostructure based on this material is mainly NiCo 2 o 4 Nanowire or NiCo 2 o 4 Nanosheets, for NiCo 2 o 4 As far as nanowires are concerned, there are large pores between nanowires, and these pores are relatively large in size. For the electrode material per unit volume, the space formed by these pores cannot be effectively used, reducing the material capacity. volume usage of

Method used

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  • NiCo2O4@NiCo2O4 nanometer material for super capacitor electrode and preparation method thereof
  • NiCo2O4@NiCo2O4 nanometer material for super capacitor electrode and preparation method thereof
  • NiCo2O4@NiCo2O4 nanometer material for super capacitor electrode and preparation method thereof

Examples

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Embodiment 1

[0029] 1) Weigh Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 · 6H 2 O, CO (NH 2 ) 2 Dissolve in deionized water, stir evenly at room temperature to form a transparent and uniform solution; then transfer the solution to a polytetrafluoroethylene-lined reactor, immerse the substrate in the solution in the reactor, and then place it in a 110 ℃ for 10 hours; after the reaction, take out the substrate, wash and dry it, and anneal the substrate with nanowires at 300℃ for 3 hours to obtain NiCo 2 o 4 Nanowires.

[0030] 2) Weigh NiSO with a substance ratio of 1:2:0.25 4 ·6H 2 O. CoSO 4 ·7H 2 O, K 2 S 2 o 8 Dissolve in deionized water, stir until completely dissolved to obtain a mixed solution, and then add NH 3 ·H 2 O was added to the solution; the NiCo grown in step 1) 2 o 4 The substrate of the nanowires was immersed in the solution for 4 minutes to react, taken out and washed and dried to obtain NiCo with a homogeneous core-shell structure. 2 o 4 NiCo 2 o 4 Nanowires. ...

example 2

[0032] 1) Weigh Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 · 6H 2 O, CO (NH 2 ) 2 Dissolve in deionized water, stir evenly at room temperature to form a transparent and uniform solution; transfer the solution to a polytetrafluoroethylene-lined reaction kettle, immerse the substrate in the solution in the reaction kettle, and then place it at 120 ℃ oven reaction 7h. After the reaction, the substrate was taken out, washed and dried, and the substrate with nanowires was annealed at 300°C for 3 hours to obtain NiCo 2 o 4 Nanowires.

[0033] 2) Weigh out NiSO with a substance ratio of 1:2:0.25 4 ·6H 2 O. CoSO 4 ·7H 2 O, K 2 S 2 o 8 Dissolve in deionized water, stir until completely dissolved to obtain a mixed solution, and then add NH 3 ·H 2 O was added to the solution; the NiCo grown in step 1) 2 o 4 The substrate of the nanowire is immersed in the solution for 8 minutes to react, taken out and washed and dried to obtain NiCo with a homogeneous core-shell structure. 2 ...

Embodiment 3

[0035] 1) Weigh Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 · 6H 2 O, CO (NH 2 ) 2 Dissolve in deionized water, stir evenly at room temperature to form a transparent and uniform solution. The solution was transferred to a polytetrafluoroethylene-lined reactor, the substrate was immersed in the solution in the reactor, and then placed in an oven at 130° C. for 5 hours. After the reaction, the substrate was taken out, washed and dried, and the substrate with nanowires was annealed at 300°C for 3 hours to obtain NiCo 2 o 4 Nanowires.

[0036] 2) Weigh out NiSO with a substance ratio of 1:2:0.25 4 ·6H 2 O. CoSO 4 ·7H 2 O, K 2 S 2 o 8 Dissolve in deionized water, stir until completely dissolved to obtain a mixed solution, and then add NH 3 ·H 2 O was added to the solution; the NiCo grown in step 2) 2 o 4 The substrate of the nanowire is immersed in the solution for 12 minutes to react, then taken out and washed and dried to obtain NiCo with a homogeneous core-shell struct...

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Abstract

The invention discloses a NiCo2O4@NiCo2O4 nanometer material for a super capacitor electrode and a preparation method thereof. The NiCo2O4@NiCo2O4 nanometer material is of a homogeneous core-shell nanostructure. The core structure and the shell structure are composed of NiCo2O4 nanowires, and the shell structure NiCo2O4 nanowires grow densely on the core structure NiCo2O4 nanowires. The preparation method comprises the steps: the core structure NiCo2O4 nanowires are obtained through a hydrothermal reaction method; on the core structure NiCo2O4 nanowires, the shell structure NiCo2O4 nanowires are further prepared through an electrochemical reaction method; and finally, the NiCo2O4@NiCo2O4 nanowires of the homogeneous core-shell structure are obtained. The length of the prepared NiCo2O4@NiCo2O4 nanowires can reach 2 mums, and the diameter thereof is 100-200 nm; tested in a three-electrode system and under the constant current of 10 mA / cm<2>, the area specific volume can reach 2.6 F / cm<2>; and after 1000 times of charge-discharge cycle attenuation, the specific capacitance is still larger than 90% of the original value, and the charge transfer impedance is 1.0 omega / cm<2>. The prepared homogeneous core-shell structure nanowire electrode has the advantages of high specific capacitance, good cycle performance, low charge transfer impedance, simple preparation method and low cost and the like.

Description

technical field [0001] The invention relates to an electrode material used as a supercapacitor electrode material and a preparation method thereof, in particular to a metal oxide nanometer material used as a supercapacitor electrode material and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device, which uses porous carbon materials with high specific surface area as electrodes or uses electrode active materials for underpotential deposition, so that it can undergo rapid and reversible chemical adsorption / desorption or oxidation / reduction reactions to Obtain the capacitance of the order of Faraday, so it has both the energy storage characteristics of the battery and the power characteristics of the capacitor. It is thousands of times higher than the specific energy of the traditional electrolytic capacitor, and the leakage current is thousands of times smaller. It can charge and discharge 100,000 times More than a ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/46H01G11/86B82Y30/00
CPCY02E60/13H01G11/24H01G11/86
Inventor 吕建国袁禹亮
Owner ZHEJIANG UNIV
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