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Preparation method of nano Co3O4 octahedron powder

An octahedral and powder technology, which is applied in the field of preparation of Co3O4 octahedral powder and achieves the effects of good controllability, good operability and good monodispersity

Inactive Publication Date: 2013-05-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reported Co 3 o 4 The size of the octahedron (usually refers to the edge length of the octahedron) is large (generally greater than 500nm), and there is no known nano-Co 3 o 4 Research results of octahedral powder

Method used

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  • Preparation method of nano Co3O4 octahedron powder
  • Preparation method of nano Co3O4 octahedron powder

Examples

Experimental program
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Effect test

Embodiment 1

[0016] In this embodiment, a kind of nano Co 3 o 4 The preparation method of octahedral powder comprises the steps:

[0017] Step 1: Prepare a solution with 0.15g of cobalt nitrate and 30mL of absolute ethanol, and call it solution A;

[0018] Step 2: Add 0.10 g of PVP to the solution A prepared in step 1 to obtain a mixed solution, then magnetically stir the above mixed solution for 10 minutes, and record it as solution B;

[0019] Step 3: Add the solution B prepared in step 2 into a reaction kettle with a capacity of 50mL, and heat it to 180°C for 36h to obtain a solution containing Co 3 o 4 Precipitated solid-liquid mixture;

[0020] Step 4: the Co obtained in step 3 3 o 4 The precipitated solid-liquid mixture was centrifuged and washed five times with deionized water and absolute ethanol, respectively, and then the centrifuged and washed product was dried at 60 °C for 6 h to obtain nano-Co 3 o 4 Octahedral powder.

[0021] Such as figure 1 As shown, the nano-Co p...

Embodiment 2

[0023] In this embodiment, a kind of nano Co 3 o 4 The preparation method of octahedral powder comprises the steps:

[0024] Step 1: Prepare a solution with 0.15g of cobalt nitrate and 30mL of absolute ethanol, and call it solution A;

[0025] Step 2: Add 0.05g of PVP to the solution A prepared in step 1 to obtain a mixed solution, then magnetically stir the above mixed solution for 10 minutes, and record it as solution B;

[0026] Step 3: Add the solution B prepared in step 2 into a reaction kettle with a capacity of 50mL, and heat it to 180°C for 36h to obtain a solution containing Co 3 o 4 Precipitated solid-liquid mixture;

[0027] Step 4: the Co obtained in step 3 3 o 4 The precipitated solid-liquid mixture was centrifuged and washed five times with deionized water and absolute ethanol, respectively, and then the centrifuged and washed product was dried at 60 °C for 6 h to obtain nano-Co 3 o 4 Octahedral powder.

[0028] Such as figure 2 As shown, the nano-Co p...

Embodiment 3

[0030] In this embodiment, a kind of nano Co 3 o 4 The preparation method of octahedral powder comprises the steps:

[0031] Step 1: Mix 0.15g of cobalt nitrate and 35mL of absolute ethanol into a solution, which is called solution A;

[0032] Step 2: Add 0.15g of PVP to the solution A prepared in step 1 to obtain a mixed solution, then magnetically stir the above mixed solution for 5 minutes, and record it as solution B;

[0033] Step 3: Add the solution B prepared in step 2 into a reaction kettle with a capacity of 50mL, and heat it to 140°C for 48h to obtain a solution containing Co 3 o 4 Precipitated solid-liquid mixture;

[0034] Step 4: the Co obtained in step 3 3 o 4 The precipitated solid-liquid mixture was centrifuged and washed three times with deionized water and absolute ethanol, respectively, and then the centrifuged and washed product was dried at 80 °C for 4 h to obtain nano-Co 3 o 4 Octahedral powder.

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Abstract

The invention discloses a preparation method of nano Co3O4 octahedron powder. The preparation method comprises the following steps of: 1, preparing an ethanol solution of a cobalt salt, to be specific, preparing a cobalt salt solution by using absolute ethyl alcohol as a solvent to ensure that the mol concentration is 0.0001-1.0 mol / L and the cobalt salt solution is used as a solution A; 2, adding a certain amount of polyvinylpyrrolidone (PVP) in the solution A prepared in the step 1 to obtain a mixture solution, wherein the mass ratio of the cobalt salt to the PVP in the mixture solution is (1:100)-(100:1); and then magnetically stirring the mixture solution for 5-10minutes to obtain a solution B; 3, adding the solution B prepared in the step 2 into a reaction kettle, heating to 140-240 DEG C and preserving the temperature for 6-48hours to obtain a solid-liquid mixture containing Co3O4 sediment; and 4, respectively centrifugally washing the solid-liquid mixture containing the Co3O4 sediment, obtained in the step 3, by using deionized water and absolute ethyl alcohol for 3-5 times, and then drying the centrifugally washed product for 1-12hours at a temperature of 50-80 DEG C to obtain the nano Co3O4 octahedron powder. The method is simple and easy to operate, and can be used for preparing the nano Co3O4 octahedron powder with regular shape, uniform size and good monodispersity.

Description

technical field [0001] The present invention relates to a Co 3 o 4 The preparation method of octahedral powder, be specifically related to a kind of nanometer Co 3 o 4 Preparation method of octahedral powder. Background technique [0002] Cobalt tetroxide (Co 3 o 4 ) Micro-nano materials have been used in low-temperature catalytic oxidation of carbon monoxide, lithium-ion batteries, supercapacitors, photocatalysis and gas sensors. A large number of current studies have shown that the properties of materials are closely related to the exposed crystal planes of their microstructure units. Co that has been reported in the literature 3 o 4 The crystal morphology mainly includes: nanowire, nanorod, polyhedron (cube, octahedron and tetradecahedron) and hierarchical structure (including porous, urchin-like, hollow sphere and flower-like, etc.). Among them, the octahedral Co 3 o 4 The structure (consisting of eight (111) crystal planes) is highly chemically active due to ...

Claims

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Application Information

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IPC IPC(8): C01G51/04B82Y30/00B82Y40/00
Inventor 孙少东杨志懋张晓哲宋晓平孔春才
Owner XI AN JIAOTONG UNIV
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