Hexagonal flaky cobalt hydroxide synthesis method

A technology of cobalt hydroxide and synthesis method, applied in the direction of cobalt oxide/cobalt hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of difficult mass production, low reactant concentration, and reaction temperature High-level problems, to achieve good industrial production application prospects, short reaction time, and easy-to-use effects

Inactive Publication Date: 2016-12-07
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can obtain regular nano-sheet cobalt hydroxide, the concentration of reactants is very low, the yield is low, and the reaction temperature is high and the time is long, so it is difficult to realize mass production

Method used

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  • Hexagonal flaky cobalt hydroxide synthesis method
  • Hexagonal flaky cobalt hydroxide synthesis method
  • Hexagonal flaky cobalt hydroxide synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare 0.5mol / L cobalt chloride aqueous solution; dissolve 10g sodium hydroxide and 1ml hydrazine hydrate in deionized water. Under the situation of vigorous stirring, add sodium hydroxide and hydrazine hydrate mixed solution rapidly in the cobalt chloride solution, make the mol ratio of sodium hydroxide and cobalt chloride be 5:1, the mol ratio of hydrazine hydrate and cobalt chloride is 0.35:1, fully reacted, washed with deionized water and absolute ethanol, and then dried at 60°C for 4 hours in a nitrogen atmosphere to obtain the following figure 1 Hexagonal nanoflakes of cobalt hydroxide are shown.

Embodiment 2

[0023] Prepare 0.005mol / L cobalt chloride aqueous solution; dissolve 0.05g sodium hydroxide and 0.5ml hydrazine hydrate in deionized water. Under the situation of strong stirring, add sodium hydroxide and hydrazine hydrate mixed solution rapidly in the cobalt chloride solution, make the mol ratio of sodium hydroxide and cobalt chloride be 2.5:1, the mol ratio of hydrazine hydrate and cobalt chloride is 17.5:1, fully reacted, washed with deionized water and absolute ethanol, and then dried at 60°C for 4 hours under a nitrogen atmosphere to obtain the following figure 2 Hexagonal nanoflakes of cobalt hydroxide are shown. image 3 It shows that the synthesized hexagonal nano-sheet cobalt hydroxide has a good crystal structure, and the synthesized hexagonal nano-sheet cobalt hydroxide is beta cobalt hydroxide.

Embodiment 3

[0025] Prepare 0.05mol / L cobalt chloride aqueous solution; dissolve 0.5g sodium hydroxide and 10ml hydrazine hydrate in deionized water. Under the situation of strong stirring, add sodium hydroxide and hydrazine hydrate mixed solution rapidly in the cobalt chloride solution, make the mol ratio of sodium hydroxide and cobalt chloride be 2.5:1, the mol ratio of hydrazine hydrate and cobalt chloride is 35:1, fully reacted, washed with deionized water and absolute ethanol, and then dried at 60°C for 4 hours in a nitrogen atmosphere to obtain hexagonal nanosheet-shaped cobalt hydroxide.

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Abstract

The present invention relates to a hexagonal flaky cobalt hydroxide synthesis method, which comprises: dissolving a cobalt salt in deionized water to obtain a cobalt salt solution; dissolving caustic alkali and one or a plurality of small molecular nitrogen-containing ligands in deionized water so as to be adopted as a precipitant solution; and adding the precipitant solution into the cobalt salt solution to react with the cobalt ions so as to generate the cobalt hydroxide. According to the present invention, during the reaction precipitation process of the hydroxide ions and the cobalt ions, a certain amount of the one or the plurality of the small molecular nitrogen-containing ligands are added, and the nitrogen-containing ligands are strongly matched with the cobalt ions to make the cobalt hydroxide grow according to a certain direction, such that finally the hexagonal flaky structure having the edge length of 100-400 nm is formed; and the flaky structure can be obtained at the room temperature under the high concentration, the reaction time is short, and the mass production can be achieved.

Description

technical field [0001] The invention relates to a method for synthesizing cobalt hydroxide, in particular to a method for synthesizing cobalt hydroxide with a hexagonal nanosheet structure. Background technique [0002] Flake cobalt hydroxide and nano-scale flake cobalt oxide and cobalt tetroxide obtained from flake cobalt hydroxide have unique layered structure, multi-electron reaction characteristics and good redox reaction activity. They are used in supercapacitors, lithium-ion batteries, Ni-MH batteries have a wide range of application value. Especially as a supercapacitor electrode material, the theoretical specific capacitance of flake cobalt hydroxide is 3458F / g, which has very good application value. The specific capacitance of cobalt hydroxide prepared by traditional methods is in the range of 200-341F / g, and obtaining nano-scale flake cobalt hydroxide is the key to improving its performance. At present, the synthesis method of cobalt hydroxide at home and abroad ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y30/00B82Y40/00
Inventor 李治应曾蓉蒋利军
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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