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ZnO/ZnFe2O4/C nano-structure hollow spheres and preparation method of same

A nanostructure, znfe2o4 technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., to achieve the effect of simple method, improved performance and avoiding compounding

Active Publication Date: 2015-12-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, so far, the prepared ZnO / ZnFe 2 o 4 The heterojunctions are all at the micron level. Although the separation of photogenerated electron vacancies can be improved, since the size of the heterojunction is much smaller than the size of the material, most of the photogenerated electron vacancies will still recombine in the body, so we need It is urgent to prepare nanometer-sized heterojunctions, especially heterojunctions smaller than 10 nanometers, to further improve the separation of photogenerated electron vacancy pairs

Method used

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  • ZnO/ZnFe2O4/C nano-structure hollow spheres and preparation method of same
  • ZnO/ZnFe2O4/C nano-structure hollow spheres and preparation method of same
  • ZnO/ZnFe2O4/C nano-structure hollow spheres and preparation method of same

Examples

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Embodiment 1

[0022](1) Add 2.97g of zinc nitrate hexahydrate to 100mL of N,N-dimethylformamide to prepare a solution of Zn ions with a concentration of 0.1M. Add 5g of carbon spheres to the above solution, ultrasonically disperse the carbon spheres for 1h, stir and absorb for 36h, then filter with suction, wash twice with ethanol, then place the obtained sample in an oven at 90°C and dry for 24h;

[0023] (2) Add 0.404g of ferric nitrate nonahydrate to 100mL of N,N-dimethylformamide to prepare a solution of Fe ions with a concentration of 0.01M. Add the sample obtained after drying in step (1) to the above solution, ultrasonically disperse it for 1 hour, stir and absorb for 12 hours, centrifuge, and wash twice with ethanol, then place the obtained sample at 90°C and dry it for 24 hours;

[0024] (3) The sample obtained after drying in step (2) was heat-treated in air at 600°C for 48 hours to remove the carbon sphere template and obtain ZnO / ZnFe 2 o 4 Nanostructured hollow sphere; its XRD...

Embodiment 2

[0028] (1) Add 0.297g of zinc nitrate hexahydrate to 100mL of N,N-dimethylformamide to prepare a solution of Zn ions with a concentration of 0.01M. Add 0.5g PS spheres to the above solution, ultrasonically 0.5h to fully disperse the PS spheres, stir and absorb for 12h, then filter with suction, wash twice with ethanol, then place the obtained sample in an oven at 50°C, and dry for 6h;

[0029] (2) Add 0.0404g of ferric nitrate nonahydrate to 100mL of N,N-dimethylformamide to prepare a solution of Fe ions with a concentration of 0.001M. Add the sample obtained after drying in step (1) to the above solution, ultrasonically 0.5h to fully disperse, stir and absorb for 4h, centrifuge, and wash twice with ethanol, then place the obtained sample at 50°C and dry for 6h;

[0030] (3) The sample obtained after drying in step (2) was heat-treated in air at 400°C for 6 hours to remove the PS spherical template and obtain ZnO / ZnFe 2 o 4 Nanostructured hollow spheres;

[0031] (4) Add 10...

Embodiment 3

[0033] (1) Add 1.485g of zinc nitrate hexahydrate to 100mL of N,N-dimethylformamide to prepare a solution of Zn ions with a concentration of 0.05M. 3gSiO 2 The spheres were added to the above solution and ultrasonicated for 0.75h to make the SiO 2 The balls were fully dispersed, stirred and adsorbed for 24 hours, then suction filtered, washed twice with ethanol, and then the obtained samples were placed in an oven at 70°C and dried for 18 hours;

[0034] (2) Add 0.202g of ferric nitrate nonahydrate to 100mL of N,N-dimethylformamide to prepare a solution of Fe ions with a concentration of 0.005M. Add the sample obtained after drying in step (1) to the above solution, ultrasonically 0.75h to make it fully dispersed, stir and absorb for 8h, centrifuge, and wash twice with ethanol, then place the obtained sample at 70°C and dry for 18h;

[0035] (3) The sample obtained after drying in step (2) was heat-treated in air at 500 °C for 28 h, and then immersed in a NaOH solution with ...

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Abstract

The invention discloses a ZnO / ZnFe2O4 / C nano-structure hollow sphere. A shell of the hollow sphere is formed by a ZnO / ZnFe2O4 layer and a C layer from interior to exterior, wherein the thickness of each layer is less than 10 nm. In the invention, the ZnO / ZnFe2O4 / C nano-structure hollow sphere is prepared through a template adsorption method and through the steps of step-by-step adsorption, subsequent hydrothermal treatment and annealing treatment and the like. The ZnO / ZnFe2O4 / C nano-structure hollow sphere has a regular core-shell structure and is controllable in the thickness of each layer. The grain size of ZnO and ZnFe2O4 is 6-10 nm. The hollow sphere is good in crystallization property and is more than 200 m<2> / g in specific surface area. The method is simple, is low in cost, is advantaged in industrial production, and has excellent application value in the fields of lithium ion batteries, super capacitors, gas sensors, photo-catalytic decomposition to produce hydrogen and the like.

Description

technical field [0001] The invention relates to a hollow nanosphere and a preparation method thereof, in particular to a ZnO / ZnFe 2 o 4 / C nanostructure hollow sphere and its preparation method. Background technique [0002] Mankind is facing the crisis of depletion of coal, oil and other energy sources, and the search for new alternative energy sources has attracted the attention of all countries. Solar energy is an inexhaustible and inexhaustible energy source, and scientists are also working hard to convert solar energy into storable electrical energy and chemical energy. Hydrogen production by photocatalytic water splitting is the best way for photochemical conversion of solar energy, because hydrogen energy, as a secondary energy source, has advantages that other energy sources cannot match, such as cleanliness, safety, and high efficiency. Climate change, fuel cell technology and increasingly prominent environmental issues have promoted the emergence of "hydrogen en...

Claims

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Application Information

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IPC IPC(8): B01J23/80B82Y30/00B82Y40/00C01B3/04
CPCY02E60/36
Inventor 朱丽萍宋辉李亚光楼子瑞
Owner ZHEJIANG UNIV