Nickel tetrathiocobaltate/cobalt hydroxide nanosheet array structure composite material and preparation and application thereof

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, good electrolyte diffusion, and improve specific capacitance performance

Active Publication Date: 2019-12-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] 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 tetrathiocobaltate/cobalt hydroxide nanosheet array structure composite material and preparation and application thereof
  • Nickel tetrathiocobaltate/cobalt hydroxide nanosheet array structure composite material and preparation and application thereof
  • Nickel tetrathiocobaltate/cobalt hydroxide nanosheet array structure composite material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Using carbon cloth as a substrate to prepare NiCo with a nanosheet array structure 2 S 4 / Co(OH) 2 composite material

[0040] (1) Pretreatment of carbon cloth

[0041] 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.

[0042] (2) Synthesis of cobalt-nickel bimetallic organic ligand precursor

[0043] 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

[0051] Example 2: Using graphene as a substrate to prepare NiCo with a nanosheet array structure 2 S 4 / Co(OH) 2 composite material

[0052] (1) Pretreatment of graphene oxide

[0053] 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.

[0054] (2) Synthesis of cobalt-nickel bimetallic organic ligand precursor

[0055] 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

[0065] 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

[0066] (1) Pretreatment of nickel foam

[0067] 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.

[0068] (2) Synthesis of cobalt-nickel bimetallic organic ligand precursor

[0069] 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 NiCo2S4/Co(OH)2 nanosheet array structure composite material and a preparation method and application thereof. Firstly, by controlling a ratio of metal ions to dimethylimidazole, a cobalt nickel bimetallic organic ligand precursor is prepared by using a solvothermal method, the precursor has a two-dimensional nanosheet array structure, and the nanosheet structure and a pore size ensure relatively high atomic utilization rate and relatively good electrolyte diffusion. Secondly, by adjusting a concentration ratio of cobalt and nickel metal salts in the precursor, a controlled liquid phase hydrolysis-sulfurization process is utilized, namely the cobalt nickel bimetallic organic ligand precursor is vulcanized to a cobalt nickel bimetallic sulfide, and a part of cobaltis simultaneously hydrolyzed to cobalt hydroxide, that is to say, a NiCo2S4/Co(OH)2 compound is obtained through one hydrothermal reaction, so that the pseudocapacitance behavior of the cobalt-nickelbimetals is synergistic with each other, the specific capacitance performance is greatly improved, the maximum specific capacitance is up to 3668 F/g, and the specific capacitance is higher than the theoretical specific capacity of cobalt metal.

Description

[0001] (1) Technical field [0002] 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. [0003] (2) Background technology [0004] 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. [0005] The key factor for the energy storage performance of...

Claims

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Application Information

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Patent Type & Authority Applications(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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