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Ultrathin Ni-Co stratified-structure hydroxide as well as preparation method and application thereof

A layered structure and hydroxide technology, which is applied in the manufacture of cobalt oxide/cobalt hydroxide, nickel oxide/nickel hydroxide, hybrid/electric double layer capacitors, etc., can solve the problems of complicated process and harsh reaction conditions, and achieve The effect of simple process route and excellent capacitance effect

Active Publication Date: 2017-06-20
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the preparation of layered materials by this "top-down" exfoliation method generally undergoes a two-step process of hydroxide preparation and exfoliation. The process is relatively complicated and the reaction conditions are harsh.

Method used

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  • Ultrathin Ni-Co stratified-structure hydroxide as well as preparation method and application thereof
  • Ultrathin Ni-Co stratified-structure hydroxide as well as preparation method and application thereof
  • Ultrathin Ni-Co stratified-structure hydroxide as well as preparation method and application thereof

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Effect test

preparation example Construction

[0025] According to a specific embodiment of the present invention, the preparation method includes the following steps.

[0026] Step A:

[0027] Ni(Ac) 2 4H 2 O and Co(Ac) 2 4H 2 O and hexamethylenetetramine were added to distilled water, then absolute ethanol and ethylene glycol dissolved in P123 were added in sequence, and stirred until all raw materials were completely dissolved to obtain a mixed solution.

[0028]This step mainly involves dissolving the raw materials, dissolving and mixing the solid raw materials with the solvent and the structure directing agent to form a mixed solution. Among them, Co(Ac) 2 4H 2 O and Ni(Ac) 2 4H 2 O is used as cobalt source and nickel source respectively, and hexamethylenetetramine is slowly released by hydrolysis and provides OH - Cobalt ions and nickel ions are precipitated, P123 and ethylene glycol are used as structure-directing agents, and ethanol and water together form a mixed solvent. P123 and ethylene glycol as stru...

Embodiment 1

[0045] Embodiment 1: the addition of P123 is 0.2g

[0046] 1) Take 0.25g Ni(Ac) 2 4H 2 O and 0.50g Co(Ac) 2 4H 2 O and 1.68g of hexamethylenetetramine were added to 4mL of distilled water, then 40mL of absolute ethanol containing 0.2g of P123 and 30mL of ethylene glycol were added successively, and stirring was continued until all the raw materials were completely dissolved to obtain a mixed solution.

[0047] 2) The mixed solution was transferred to a 100 mL autoclave, and the temperature was gradually raised from room temperature to 170° C. under the condition of stirring, and the reaction was stirred at 170° C. for 2 h. Then, take out the obtained reaction liquid after it is naturally cooled to room temperature under the condition of stirring.

[0048] 3) Centrifuge the reaction solution (8000rmp) to separate the precipitate, wash it repeatedly with secondary water and absolute ethanol in turn, and dry the washed precipitate in a blast drying oven at 60°C for at least 1...

Embodiment 2

[0051] Embodiment 2: the addition of P123 is 0.5g

[0052] 1) Take 0.25g Ni(Ac) 2 4H 2 O and 0.50g Co(Ac) 2 4H 2 O and 1.68g of hexamethylenetetramine were added to 4mL of distilled water, then 40mL of absolute ethanol in which 0.5g of P123 was dissolved, and 30mL of ethylene glycol were added successively, and stirring was continued until all the raw materials were completely dissolved to obtain a mixed solution.

[0053] 2) The mixed solution was transferred to a 100 mL autoclave, and the temperature was gradually raised from room temperature to 170° C. under the condition of stirring, and the reaction was stirred at 170° C. for 2 h. Then, take out the obtained reaction liquid after it is naturally cooled to room temperature under the condition of stirring.

[0054] 3) Centrifuge the reaction solution (8000rmp) to separate the precipitate, wash it repeatedly with secondary water and absolute ethanol in turn, and dry the washed precipitate in a blast drying oven at 60°C f...

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Abstract

The invention discloses an ultrathin Ni-Co stratified-structure hydroxide as well as a preparation method and application thereof. According to the preparation method, Co(Ac)2.4H2O and Ni(Ac)2.4H2O are respectively taken as a cobalt source and a nickel source, an amphipathic segmented copolymer P123 and a glycol cosurfactant are taken as structure-directing agents, and the ultrathin Ni-Co stratified-structure hydroxide is prepared in a mixed solvent system containing ethanol and a small amount of water by virtue of a one-step hydrothermal method. The ultrathin Ni-Co stratified-structure hydroxide is prepared by virtue of the preparation method. The ultrathin Ni-Co stratified-structure hydroxide is used as an electrode material of a supercapacitor. According to the preparation method, a two-dimensional ultrathin stratified-structure material is prepared, a simple, feasible and low-cost method is provided, and meanwhile, an excellent electrode material is provided for the supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of synthesis of novel inorganic nanometer energy storage materials, and more specifically relates to an ultrathin Ni-Co layered structure hydroxide and its preparation method and application. Background technique [0002] Two-dimensional layered nanostructures have shown excellent properties in catalysis, photoelectrochemistry, and electrochemistry due to their large lateral dimensions (up to several microns or even tens of microns) and small thicknesses. Two-dimensional metal layered hydroxides (LDHs) are a class of ionic layered compounds, generally composed of positively charged brucite layers, containing some anions and solvent molecules that can balance positive charges between the layers, and the metal ions are located in eight In the center of the octahedron, hydroxide ions occupy the vertices of the octahedron, and these hydroxide ions are interconnected to form a two-dimensional sheet structure. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G51/04B82Y40/00H01G11/30H01G11/24H01G11/86
CPCY02E60/13C01G53/04C01G51/04C01P2002/22C01P2002/72C01P2004/03C01P2004/24C01P2006/40H01G11/24H01G11/30H01G11/86
Inventor 雷英李敏娇谢华明刘晓强
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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