Preparation method for carbon-film-coated zinc oxide hollow sphere

A technology of zinc oxide and coating, which is applied in the field of preparation of zinc oxide hollow balls, to achieve the effects of increasing the contact area, making the production process environmentally friendly, and improving the charging and discharging efficiency

Inactive Publication Date: 2016-05-04
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The template used in the preparation of ZnO hollow spheres in the present invention is pollen, and the carbon source of the coated carbon film is sericin protein discarded in the silk extraction process. The whole preparation process has the advantages of simplicity, convenience, environmental friendliness, and waste utilization. People have used this method to coat ZnO hollow spheres with carbon films

Method used

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  • Preparation method for carbon-film-coated zinc oxide hollow sphere
  • Preparation method for carbon-film-coated zinc oxide hollow sphere

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mix 50ml of ethanol solution of zinc acetate (purity: 99.5%) with a concentration of 0.10mol / l, and 0.0439g of rapeseed pollen (mass ratio to zinc acetate = 25:1) with a purity of 99%, and ultrasonically disperse for 30min; then The mixture was placed in a water bath at 80 °C and stirred magnetically. Take by weighing urea 0.6030g (OH - : Zn 2+ Molar ratio = 2:1) dissolved in 50ml ethanol solution. Add the urea solution drop by drop to the mixed solution of zinc acetate and rape pollen, the titration rate is 0.1ml / min, and continue to stir and age for 2h after the drop. The aged solution was centrifuged 5 times, and the precipitate was washed with ethanol after each centrifugation. The isolated precipitate was dried at 80 °C for 12 h. The dried white powder is placed in a high-temperature furnace and sintered in air at a sintering temperature of 400°C and kept at this temperature for 3 hours. The ZnO hollow spheres without the pollen template were obtained after th...

Embodiment 2

[0027] Mix 50ml of ethanol solution of zinc nitrate (purity: 99.5%) with a concentration of 0.50mol / l, and 0.1487g of camellia pollen (mass ratio to zinc acetate = 50:1) with a purity of 99%, and ultrasonically disperse for 20min; then The mixture was placed in a water bath at 80 °C and stirred magnetically. Weigh 1.5075g of urea (OH) with a purity of 99.5% - : Zn 2+ Molar ratio = 1:1) dissolved in 100ml ethanol solution. Add the urea solution drop by drop to the mixed solution of zinc nitrate and camellia pollen, the titration rate is 0.15ml / min, and continue to stir and age for 2h after the drop. The aged solution was centrifuged 5 times, and the precipitate was washed with ethanol after each centrifugation. The separated precipitate was dried at 100 °C for 8 h. The dried white powder is placed in a high-temperature furnace and sintered in air at a sintering temperature of 500°C and kept at this temperature for 4 hours. The ZnO hollow spheres without the pollen template...

Embodiment 3

[0029] Mix 50ml of ethanol solution of zinc nitrate (purity: 99.5%) with a concentration of 1.0mol / l, and 0.1487g of camellia pollen (mass ratio to zinc nitrate = 100:1) with a purity of 99%, and ultrasonically disperse for 10 minutes; then The mixture was placed in a water bath at 80 °C and stirred magnetically. Weighing urea 4.5223g (OH - : Zn 2+Molar ratio = 1.5:1) dissolved in 100ml ethanol solution. Add the urea solution drop by drop to the mixed solution of zinc nitrate and camellia pollen, the titration rate is 0.2ml / min, and continue stirring and aging for 1.5h after dropping. The aged solution was centrifuged 5 times, and the precipitate was washed with ethanol after each centrifugation. The separated precipitate was dried at 90 °C for 10 h. The dried white powder is placed in a high-temperature furnace and sintered in air at a sintering temperature of 600°C and kept at this temperature for 5 hours. The ZnO hollow spheres without the pollen template were obtained...

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Abstract

The invention relates to a preparation method for a carbon-film-coated zinc oxide hollow sphere. Pollen is taken as a template for preparing a ZnO hollow sphere, and sericin is used as a carbon source for performing carbon film coating; the condition does not exist before the application; the preparation method comprises the steps of fully mixing zinc salt with an ethanol solution of pollen, and adding alkali liquid to a water bath in a dropwise manner; performing aging, centrifuging and separating to obtain ZnO precipitate with a pollen template; performing high temperature sintering on dried white powder to obtain the ZnO hollow sphere; immersing the ZnO hollow sphere powder into a sericin solution, and performing centrifuging, separating and drying; and performing vacuum sintering on the dried powder to obtain the carbon-film-coated ZnO hollow sphere taking the sericin as the carbon source. The preparation method is low in cost, simple in process, low-carbon and environment-friendly; and the obtained carbon-film-coated ZnO hollow sphere can be used as a lithium ion battery negative electrode material, a photocatalytic material and the like.

Description

technical field [0001] The invention relates to a preparation method of a zinc oxide hollow sphere, in particular to a preparation method of a zinc oxide hollow sphere coated inside and outside a carbon film, and belongs to the technical fields of new energy, photocatalysis, and the like. Background technique [0002] Zinc oxide (ZnO) has a band gap of ~3.37eV and is a third-generation direct wide bandgap semiconductor material. ZnO has excellent properties in many aspects such as lattice, photoelectricity, piezoelectricity, gas sensitivity, and pressure sensitivity, such as high exciton binding energy (~60meV, 3 times that of GaN), high melting point (1975°C), and large saturation rate ( ~3.2×10 7 cm / s) and high breakdown voltage (4 times that of GaAs), etc., making it widely used in the fields of ultraviolet / near-ultraviolet short-wavelength optoelectronics, surface acoustic wave devices, solar cells, gas and pressure sensitive devices, photocatalysis, new energy and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M10/0525
CPCH01M4/366H01M4/483H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 武军孟雨蔡远徐军明宋开新
Owner HANGZHOU DIANZI UNIV
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