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Nickel Tetrasulfide Cobaltate/Cobalt Hydroxide Nanosheet Array Structure Composites and Its Preparation and Application

A nanosheet array and composite material technology, applied in the field of nanostructured functional materials and electrochemical energy storage, can solve the problem of low energy density of capacitors, achieve high atom utilization and improve specific capacitance performance

Active Publication Date: 2021-10-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies in the prior art, the invention provides a NiCo electrode that can be used as a supercapacitor electrode 2 S 4 / Co(OH) 2 Nanosheet array structure composite material, the maximum specific capacitance can be as high as 3668F / g, it is expected to become a new supercapacitor electrode material to overcome the defects of low energy density of traditional capacitors

Method used

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  • Nickel Tetrasulfide Cobaltate/Cobalt Hydroxide Nanosheet Array Structure Composites and Its Preparation and Application
  • Nickel Tetrasulfide Cobaltate/Cobalt Hydroxide Nanosheet Array Structure Composites and Its Preparation and Application
  • Nickel Tetrasulfide Cobaltate/Cobalt Hydroxide Nanosheet Array Structure Composites and Its Preparation and Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Using carbon cloth as a substrate to prepare NiCo with a nanosheet array structure 2 S 4 / Co(OH) 2 composite material

[0035] (1) Pretreatment of carbon cloth

[0036] Cut into 1cm×4cm carbon cloth, ultrasonically treat in acetone for 30 minutes to remove oily impurities on the surface, and then use 40% HNO 3 Soak for 15 minutes to activate the surface, then wash repeatedly with deionized water, and dry in a vacuum oven at 60°C for later use.

[0037] (2) Synthesis of cobalt-nickel bimetallic organic ligand precursor

[0038] Will Co(NO 3 ) 2 ·6H 2 O(0.72mmol) and Ni(NO 3 ) 2 ·6H 2 O (0.72mmol) was dissolved in 30mL methanol solution to form a clear solution, which was designated as solution A; dimethylimidazole (7.2mmol) was dissolved in 10mL methanol solution, which was designated as solution B. Pour A into B, stir and mix evenly, and transfer to a 50mL polytetrafluoroethylene hydrothermal kettle, put the carbon cloth treated in step (1), and ke...

Embodiment 2

[0046] Example 2: Using graphene as a substrate to prepare NiCo with a nanosheet array structure 2 S 4 / Co(OH) 2 composite material

[0047] (1) Pretreatment of graphene oxide

[0048] Using natural graphite (1g) as a raw material, a graphene oxide solution was prepared by an improved Hummer method, and the obtained graphene was dispersed in 20ml of deionized water for use.

[0049] (2) Synthesis of cobalt-nickel bimetallic organic ligand precursor

[0050] Will Co(NO 3 ) 2 ·6H 2 O(0.4mmol) and Ni(NO 3 ) 2 ·6H 2 O (0.6mmol) was dissolved in 30mL methanol solution to obtain a clear solution, which was designated as solution A; dimethylimidazole (2.4mmol) was dissolved in 10mL methanol solution, which was designated as solution B. Pour A into B, stir and mix evenly, and transfer to a 50mL polytetrafluoroethylene hydrothermal kettle, put the graphene oxide treated in step (1), keep it at a hydrothermal temperature of 120°C for 100min, and obtain a black color after cent...

Embodiment 3

[0060] Example 3: Preparation of Ni with a nanosheet array structure using nickel foam as a substrate 3 S 2 / NiCo 2 S 4 / Co(OH) 2 composite material

[0061] (1) Pretreatment of nickel foam

[0062] Cut into 1cm×4cm nickel foam, ultrasonically treat in acetone for 30 minutes to remove oily impurities on the surface, then soak in 3M HCl for 15 minutes to remove the oxide layer on the surface, then wash repeatedly with deionized water, and dry in an oven at 60°C for later use.

[0063] (2) Synthesis of cobalt-nickel bimetallic organic ligand precursor

[0064] Will Co(NO 3 ) 2 ·6H 2 O(0.4mmol) and Ni(NO 3 ) 2 ·6H 2 O (0.2mmol) was dissolved in 30mL of methanol solution to obtain a clear solution, which was designated as solution A; dimethylimidazole (2.4mmol) was dissolved in 10mL of methanol solution, which was designated as solution B. Pour A into B, stir and mix evenly, and transfer to a 50mL polytetrafluoroethylene hydrothermal kettle, put the foamed nickel sheet...

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Abstract

The invention provides a NiCo 2 S 4 / Co(OH) 2 Nanosheet array structure composite material and its preparation method and application. The first aspect of the present invention is that the cobalt-nickel bimetallic organic ligand precursor prepared by solvothermal method has two-dimensional nanosheets by controlling the ratio of metal ions to dimethylimidazole Array structure, this nanosheet structure and pore size ensure high atom utilization and better electrolyte diffusion; the second is to adjust the concentration ratio of the two metal salts of the precursor cobalt and nickel, and adopt the controlled liquid phase hydrolysis vulcanization process , that is, the cobalt-nickel bimetallic organic ligand precursor is vulcanized into a cobalt-nickel bimetallic sulfide, and a part of the cobalt is hydrolyzed into cobalt hydroxide, that is, a hydrothermal reaction to obtain NiCo 2 S 4 / Co(OH) 2 The compound makes the pseudocapacitive behavior of the cobalt-nickel bimetal cooperate with each other, greatly improving the specific capacitance performance, and the highest specific capacitance reaches 3668F / g, which is higher than the theoretical specific capacity of metal cobalt.

Description

(1) Technical field [0001] The invention belongs to the technical field of nanostructure functional materials and electrochemical energy storage, in particular to a nickel tetrasulfide cobaltate / cobalt hydroxide (NiCo 2 S 4 / Co(OH) 2 ) composite material and its preparation method, and its application as an electrode material for a supercapacitor. (2) Background technology [0002] Supercapacitor is a new type of electrochemical energy storage device, which is considered as an energy conversion and storage device with development potential. It has high power density, fast charging speed, long cycle life, wide operating temperature range, safety and pollution-free and green environmental protection. Advantages, it has broad application prospects in fields such as electric vehicles, uninterruptible power supply, mobile communications, aerospace, clean energy storage, and national defense equipment. [0003] The key factor for the energy storage performance of supercapacitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00C01G51/04H01G11/24H01G11/26H01G11/30H01G11/86B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G51/04C01G53/006C01P2002/72C01P2004/03C01P2004/04C01P2004/20C01P2006/40H01G11/24H01G11/26H01G11/30H01G11/86Y02E60/13
Inventor 郑华均宋剑兰叶笑颖叶伟青
Owner ZHEJIANG UNIV OF TECH
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