[Alpha]-phase ferric oxide porous core-shell microspheres and controllable synthetic preparation method thereof

A technology of Fe2O3 and porous core, which is applied in the field of controllable synthesis and preparation of porous core-shell microspheres with α-phase Fe2O3, which can solve the problems of inability to quickly adjust the particle size of the product, unfavorable industrial production, and damage to the product structure, etc. problems, to achieve the effects of large-scale industrial production, superior lithium storage performance, and simple preparation process

Inactive Publication Date: 2014-08-27
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the template method are low yield, high production cost, possible destruction of the structure of the product during template removal, and difficulty in product separation
At the same time, these methods often use multi-step reactions, which cannot quickly adjust the particle size of the product according to actual needs, which is not conducive to industrial production.

Method used

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  • [Alpha]-phase ferric oxide porous core-shell microspheres and controllable synthetic preparation method thereof
  • [Alpha]-phase ferric oxide porous core-shell microspheres and controllable synthetic preparation method thereof
  • [Alpha]-phase ferric oxide porous core-shell microspheres and controllable synthetic preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 8.1 g of ferric chloride in 50 g of deionized water, add 39.5 g of absolute ethanol and mix well, then transfer the above solution to a polytetrafluoroethylene bushing, put the sealed polytetrafluoroethylene bushing Put it into a hydrothermal kettle at 200°C for 12 hours, cool to room temperature, centrifuge, wash with deionized water and absolute ethanol, and dry at 70°C for 24 hours to obtain α-phase Fe2O3 porous core-shell microspheres. The prepared α-phase ferric oxide has a core-shell structure and good dispersion, such as figure 1 shown. The magnification of a single microsphere is as follows figure 2 As shown, the small pores on the surface of the nucleus can be clearly seen. The transmission image of a single microsphere is shown in image 3 As shown, the hollow structure with bright and dark contrast can be clearly seen, and the electron diffraction pattern shows that the microspheres are single crystals. The XRD patterns of the prepared microsph...

Embodiment 2

[0025] Dissolve 6 g of ferric chloride in 50 g of deionized water, add 39.5 g of absolute ethanol and mix well, then transfer the above solution to a polytetrafluoroethylene bushing, put the sealed polytetrafluoroethylene bushing Put it into a hydrothermal kettle at 180°C for 0.5 hours, cool to room temperature, centrifuge, wash with deionized water and absolute ethanol, and dry at 70°C for 24 hours to obtain α-phase Fe2O3 porous core-shell microspheres.

Embodiment 3

[0027] After dissolving 2.7 g of ferric nitrate in 158 g of absolute ethanol, transfer the above solution to a polytetrafluoroethylene bushing, put the sealed polytetrafluoroethylene bushing into a hydrothermal kettle at 150°C for 8 hours, and cool After reaching room temperature, centrifuge, wash with deionized water and absolute ethanol, and dry at 70° C. for 24 hours to obtain α-phase Fe2O3 porous core-shell microspheres.

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Abstract

The invention discloses [alpha]-phase ferric oxide porous core-shell microspheres and a controllable synthetic preparation method thereof. The [Alpha]-phase ferric oxide microspheres having porous core-shell structures can be prepared through a hydrothermal method with an inorganic soluble ferric salt being a raw material, deionized water and anhydrous alcohol being solvents and at a certain temperature for a certain time. The microspheres are 3 [mu]m in the average diameter. Cores and shells are composed of nano particles, wherein the average diameter of the nano particles is 200 nm and the average thickness of the shells is 100nm. A plurality of pores with pore diameters being 40nm are uniformly distributed on the surface of each shell with of a plurality of pores with pore diameters being 40nm. The preparation method is free of any dispersing agent and surfactant, and subsequent processes are convenient since a template is not needed. The preparation method is simple in technology, short in reaction time, large in output, is environmental-friendly and cheap in raw materials, is beneficial to large scale industrial production and the porous core-shell microspheres can be used for a lithium ion battery electrode material and a gas-sensitive material.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a controllable synthesis and preparation technology of porous core-shell microspheres with α-phase iron sesquioxide. Background technique [0002] As an n-type semiconductor, the α-phase ferric oxide is E g =2.1 eV has the characteristics of non-toxicity, low cost, and simple preparation process, making it widely used in coatings, plastics, electronics, catalysts, magnetic recording materials, lithium-ion batteries, and gas sensing. As an electrode material for lithium-ion batteries, ferric oxide has the advantages of high theoretical capacity, abundant content, good cycle life, cheapness and environmental friendliness, and is considered to be one of the ideal substitutes for commercial graphite-based carbon materials. In addition, due to its high gas sensitivity, ferric oxide can also be used to detect combustible and toxic gases in the air. [0003] Since t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B01J13/02B82Y30/00B82Y40/00G01N33/00G01N33/22H01M4/525
CPCY02E60/122Y02E60/10
Inventor 陈涛宋浩杰
Owner JIANGSU UNIV
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