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N-doped TiO2/MXene composite material and preparation method and application thereof

A composite material and mixed liquid technology, applied in the field of nanomaterials, can solve problems such as specific capacity to be improved, unfavorable electrons or ions, rapid migration, etc., and achieve stable charge and discharge cycle characteristics, high specific capacity, and the effect of expanding the distance between layers

Inactive Publication Date: 2018-10-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, MXene has received extensive attention and research as an electrode material for supercapacitors or lithium-ion batteries. However, due to the small interlayer spacing and the adsorption of groups such as -F / -OH on the surface of MXene materials, it is not conducive to the flow of electrons or ions in MXene materials. quick migration
Therefore, as a candidate electrode material for supercapacitors, the specific capacity of MXene needs to be improved.

Method used

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  • N-doped TiO2/MXene composite material and preparation method and application thereof
  • N-doped TiO2/MXene composite material and preparation method and application thereof
  • N-doped TiO2/MXene composite material and preparation method and application thereof

Examples

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Embodiment 1

[0038]see figure 1 Preparation of N-doped TiO in 2 Process for preparing N-doped TiO / MXene composites 2 / MXene composite material and use it as raw material to prepare supercapacitor electrode, the specific method is as follows:

[0039] (1) Put Ti 3 AlC 2 The material was added to a hydrofluoric acid solution with a concentration of 30wt% at a concentration of 0.1g / mL, stirred at 60°C for 4h, centrifuged at a speed of 8000rpm for 20min, and then the lower solid was washed with deionized water to medium The two-dimensional layered nanomaterial MXene-Ti with a thickness of 0.01-3 μm was prepared after vacuum drying at 60 °C for 10 h. 3 C 2 T x .

[0040] (2) the two-dimensional layered nanomaterial Ti prepared in step (1) 3 C 2 T x Add hexamethylenetetramine to deionized water at a mass ratio of 1:5, stir at a speed of 450rpm for 30min to obtain a mixed solution;

[0041] (3) Move the mixed solution obtained in step (2) to a Teflon reactor and seal it, react at 200°C...

Embodiment 2

[0044] see figure 1 Preparation of N-doped TiO in 2 Process for preparing N-doped TiO / MXene composites 2 / MXene composite material and use it as raw material to prepare supercapacitor electrode, the specific method is as follows:

[0045] (1) Put Ti 3 AlC 2 The material was added to a hydrofluoric acid solution with a concentration of 10wt% at a concentration of 0.01g / mL, stirred at 20°C for 60h, centrifuged at a speed of 8000rpm for 20min, and then the lower solid was washed with deionized water to medium The two-dimensional layered nanomaterial MXene-Ti with a thickness of 0.01-5 μm was prepared after vacuum drying at 100 °C for 3 h. 3 C 2 T x .

[0046] (2) the two-dimensional layered nanomaterial Ti prepared in step (1) 3 C 2 T x Add hexamethylenetetramine to deionized water at a mass ratio of 1:15, and stir at a speed of 450rpm for 30min to obtain a mixed solution;

[0047] (3) Move the mixed solution obtained in step (2) to a Teflon reactor to seal, react at 9...

Embodiment 3

[0050] see figure 1 Preparation of N-doped TiO in 2 Process for preparing N-doped TiO / MXene composites 2 / MXene composite material and use it as raw material to prepare supercapacitor electrode, the specific method is as follows:

[0051] (1) Put Ti 3 AlC 2 The material was added into a hydrofluoric acid solution with a concentration of 40wt% at a proportioning concentration of 0.2g / mL, stirred at 40°C for 36h, centrifuged at a speed of 8000rpm for 20min, and the lower solid was washed with deionized water to medium The two-dimensional layered nanomaterial MXene-Ti with a thickness of 0.01-2 μm was prepared after vacuum drying at 80 °C for 6 h. 3 C 2 T x .

[0052] (2) the two-dimensional layered nanomaterial Ti prepared in step (1) 3 C 2 T x Add hexamethylenetetramine to deionized water at a mass ratio of 1:9, stir at a speed of 450rpm for 30min to obtain a mixed solution;

[0053] (3) Move the mixed solution obtained in step (2) to a Teflon reactor to seal, react ...

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Abstract

The invention relates to an N-doped TiO2 / MXene composite material and preparation method and application thereof, and belongs to the technical field of a nanometer material. The preparation method comprises the steps of preparing an MXene material and preparing the N-doped TiO2 / MXene composite material by taking the MXene material and hexamethylene tetramine as raw materials by a hydrothermal method. The MXene in the composite material is of a two-dimensional layered structure, TiO2 nanoparticles are distributed between MXene material layers and in surfaces of the MXene material layers, an NH<4+> ion insertion layer is arranged between the MXene material layers, and N atoms are doped in the MXene. When used for fabricating a supercapacitor electrode, the composite material has favorable conductivity and also has relatively high specific capacity and stable charge-discharge cycle property. The preparation method of the composite material is simple, is low in cost and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a kind of N-doped TiO 2 / MXene composites and their preparation methods and applications. Background technique [0002] With the development of modern society, fossil energy sources are constantly depleted and exhausted, and the problem of environmental pollution has become increasingly prominent. The development and research of new renewable clean energy sources have attracted widespread attention. As a new energy storage device between traditional capacitors and lithium-ion batteries, supercapacitors have the advantages of simple structure, fast charging time, high power density, and long cycle life. [0003] MXene is a new type of two-dimensional layered transition metal carbide or nitride material discovered in recent years. It is mainly prepared by etching and extracting the "A" metal atomic layer in the MAX phase material by hydrofluoric acid or other acidic mixed so...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/46H01G11/32H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 胡伟佘引张长庚
Owner CHONGQING UNIV
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