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A hollow structure ceo 2 @c Core-shell nanocomposite material and its preparation method and application

A nano-composite material, hollow structure technology, applied in nanotechnology, structural parts, nanotechnology and other directions, to achieve the effect of simple preparation method, low energy consumption, and safe preparation process

Active Publication Date: 2020-12-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In response to the above statement, the present disclosure is to overcome the shortcomings of traditional single materials while integrating the excellent properties of transition metal oxides and carbon materials, and to obtain advanced materials with high performance and multiple functions.

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  • A hollow structure ceo <sub>2</sub> @c Core-shell nanocomposite material and its preparation method and application
  • A hollow structure ceo <sub>2</sub> @c Core-shell nanocomposite material and its preparation method and application
  • A hollow structure ceo <sub>2</sub> @c Core-shell nanocomposite material and its preparation method and application

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preparation example Construction

[0036] As introduced in the background technology, in the prior art about CeO 2 There are certain deficiencies in the composite material and preparation method. In order to solve the above technical problems, in one or some embodiments of the present disclosure, a hollow structure CeO 2 The preparation method of @C core-shell nanocomposite material, comprises the following steps:

[0037] (1)CeO 2 Preparation of hollow spheres: with Ce(NO 3 ) 3 ·6H 2 O is the cerium source, ethylene glycol is used as the solvent, PVP is used as the template, and hydrochloric acid solution is added to the system for solvothermal reaction to prepare CeO 2 hollow ball;

[0038] (2) Hollow spherical CeO 2 Preparation of @C core-shell nanocomposites:

[0039] ①CeO 2 Ultrasonic dispersion in a mixed solution of water and ethanol;

[0040] ②NH 3 ·H 2 O, resorcinol, formaldehyde join step 1. in the gained suspension solution;

[0041] ③ stirring the suspension solution prepared in step ②; ...

Embodiment 1

[0075] (1) 0.5g Ce(NO 3 ) 3 ·6H 2 O was added to 15 mL of ethylene glycol, and stirred at room temperature for 0.5 h;

[0076] (2) Add 0.5g of PVP to the solution obtained in step (1), and stir at room temperature for 15 minutes;

[0077] (3) Add 1 mL of 1mol / L HCl to the solution obtained in step (2), and continue stirring for 15 min;

[0078] (4) the mixed solution that step (3) is obtained is transferred in the autoclave of the polytetrafluoroethylene liner of 20mL;

[0079] (5) Tighten the autoclave in step (4) and put it in an oven, and keep it warm at 160° C. for 3 hours; after the solvent heat treatment, naturally cool the autoclave to room temperature;

[0080] (6) Centrifuge the precipitate obtained in step (5), wash with distilled water and ethanol three times respectively, dry in a blast drying oven at 80°C for 24 hours, and grind to obtain CeO 2 powder;

[0081] (7) with the CeO obtained in step (6) 2 Disperse 100mg of powder in a mixed solution of 10mL deio...

Embodiment 2

[0087] (1) 0.5g Ce(NO 3 ) 3 ·6H 2 O was added to 15 mL of ethylene glycol, and stirred at room temperature for 0.5 h;

[0088] (2) Add 0.5g of PVP to the solution obtained in step (1), and stir at room temperature for 15 minutes;

[0089] (3) Add 0.5 mL of 1mol / L HCl to the solution obtained in step (2), and continue stirring for 15 min;

[0090] (4) the mixed solution that step (3) is obtained is transferred in the autoclave of the polytetrafluoroethylene liner of 20mL;

[0091] (5) Tighten the autoclave in step (4) and put it in an oven, and keep it warm at 160° C. for 3 hours; after the solvent heat treatment, naturally cool the autoclave to room temperature;

[0092] (6) Centrifuge the precipitate obtained in step (5), wash with distilled water and ethanol three times respectively, dry in a blast drying oven at 80°C for 24 hours, and grind to obtain CeO 2 powder;

[0093] (7) with the CeO obtained in step (6) 2 Disperse 100mg of powder in a mixed solution of 10mL de...

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Abstract

The invention relates to a hollow spherical CeO2@C core-shell nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing a CeO2 hollow sphere through a solvothermal method; then covering the surface of CeO2 with one layer of RF (Resorcinol-formaldehyde); calcining in an inert atmosphere to obtain the hollow spherical CeO2@C core-shell nano composite material. According to the hollow spherical CeO2@C core-shell nano composite material, the amount of resorcinol and formaldehyde is changed so that the thickness of a C layer of a shell can be adjusted. In the process, the preparation method is simple and a preparation process is safe, green and environmentally friendly, and has low energy consumptionand strong operability. The CeO2 prepared by the preparation method has a rough surface and has a macroporous structure; the specific surface area can be enlarged and the contact area between the CeO2 and the C layer is enlarged; the dispersion of ions and electrons is also can be promoted and the electrochemical performance is effectively improved.

Description

technical field [0001] The disclosure belongs to the technical field of nanomaterial synthesis, and in particular relates to a hollow structure CeO 2 @C Core-shell nanocomposites and their preparation methods and applications. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Due to the increasing fuel consumption, it is of great significance to develop a high-energy-density energy conversion and storage device. At present, electrochemical storage has become a research hotspot worldwide. The application of lithium-ion batteries in electronic transportation and energy storage devices has aroused widespread research interest. Lithium-ion batteries are also called secondary batteries. Their high energy density and long cycle life make them meet the urgent needs of the modern electronics industry. Among them, the application prospects of electric ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 周国伟宫庆华王荣雪曹培高婷婷黄惠
Owner QILU UNIV OF TECH
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