Preparation method of ultra-large-size titanium carbide nanosheet with wrinkle structure and application of nanosheet in electrochemical energy storage

A technology of ultra-large size and nano-sheets, applied in the application of electrochemical energy storage, the field of preparation of ultra-large-sized titanium carbide nano-sheets, can solve problems such as hindering electrolyte transmission, achieve strong operability, increase specific surface area, and increase channels Effect

Active Publication Date: 2019-06-14
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to maximize the use of Ti 3 C 2 There are still some challenges to be overcome as electrode materials for supercapacitors
For example, flake Ti 3 C 2 Inevitable restacking during discharge / charge operations hinders electrolyte transport and limits its practical application

Method used

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  • Preparation method of ultra-large-size titanium carbide nanosheet with wrinkle structure and application of nanosheet in electrochemical energy storage
  • Preparation method of ultra-large-size titanium carbide nanosheet with wrinkle structure and application of nanosheet in electrochemical energy storage
  • Preparation method of ultra-large-size titanium carbide nanosheet with wrinkle structure and application of nanosheet in electrochemical energy storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of ultra-large titanium carbide nanosheets with wrinkled structure

[0032] Step 1. Ultra-thin Ti 3 C 2 Preparation of nanosheets

[0033] (1) Add 1 g LiF to 20 mL 9 M HCl, stir magnetically until LiF is completely dissolved;

[0034] (2) To prevent local overheating, slowly add 1 g Ti 3 AlC 2 ;

[0035] (3) Put the mixture in the reaction kettle, at 60 o Under the condition of C, react for 72 h;

[0036] (4) Centrifuge the product (3500 rpm / 5 min), wash 6 times with deionized water, wash 2 times with ethanol, and dry in vacuum;

[0037] (5) Weigh 0.1 g of the dried product and disperse it in 10 mL of deionized water, and ultrasonicate for 4 h at 600 W;

[0038] (6) Centrifuge the sonicated product (3500 rpm, 1 h), and the upper liquid is the desired substance.

[0039] figure 1 Ultrathin Ti 3 C 2 SEM photographs of the nanosheets, figure 2 Ultrathin Ti 3 C 2 TEM photo of the nanosheets.

[0040] Step 2. Oversized Ti with wrinkled...

Embodiment 2

[0046] Embodiment two: Ti 3 C 2 Fabrication of Flexible Thin Film Electrodes

[0047] Supersized Ti with wrinkled structure 3 C 2 Ultrasonic dispersion of nanosheets is uniform, and Ti is prepared by vacuum filtration technology 3 C 2 film electrode and dried at room temperature for 6 h.

[0048] Figure 5 for Ti 3 C 2 The front SEM photograph of the flexible electrode, Figure 6 for Ti 3 C 2 Sectional SEM photographs of flexible electrodes.

Embodiment 3

[0049] Example 3: Ultra-thin Ti 3 C 2 Electrodes prepared from nanosheets and ultra-large Ti with wrinkled structure 3 C 2 Cyclic voltammetry test of electrodes prepared from nanosheets

[0050] 1. Working electrode: ultra-thin Ti 3 C 2 Electrode prepared from nanosheets (original size: 1.8 cm×0.8 cm; soaked size: 0.9 cm×0.8 cm, mass: 0.0035 g); reference electrode: Ag / AgCl; counter electrode: Pt sheet (1 cm×1 cm) ; Electrolyte: 0.5 M H 2 SO 4 ;CV potential window: -0.3 V~0.3 V; Immerse the thin film electrode in the electrolyte, let it stand for 10 min, and activate it until the curves completely overlap at the scan rate of 100 mV / s;

[0051] 2. Working electrode: oversized Ti with wrinkled structure 3 C 2 Electrode made of nanosheets (original size: 1.8 cm×0.8 cm; soaked size: 0.9 cm×0.8 cm, mass: 0.0035 g); reference electrode: Ag / AgCl; counter electrode: Pt sheet (1 cm×1 cm); Electrolyte: 0.5M H 2 SO 4 ;CV potential window: -0.3 V~0.3 V. Immerse the thin film ...

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Abstract

The invention discloses a preparation method of an ultra-large-size titanium carbide nanosheet with a wrinkle structure. The preparation method comprises the following steps of firstly, preparing an ultra-thin Ti3C2 nanosheet, and then carrying out a hydrothermal reaction on the ultra-thin Ti3C2 nanosheet and Na2S.9H2O to prepare the ultra-large-size Ti3C2 nanosheet with a wrinkle structure, wherein an electrode is prepared on the basis through a vacuum suction filtration technology and the energy storage performance of the electrode is researched. The titanium carbide nanosheet disclosed by the invention has the wrinkle structure, so that the specific surface area is enlarged, and the migration channels of electrolyte ions are increased; the titanium carbide nanosheet has an ultra-large size, and the microscopic size is larger than 10 mm; and the titanium carbide flexible electrode prepared by the vacuum suction filtration technology has the electrochemical energy storage property superior to that of the electrode prepared from the ultrathin titanium carbide nanosheet, the preparation can be completed under the normal-temperature and normal-pressure conditions, and the operabilityis high.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and in particular relates to a preparation method of ultra-large-sized titanium carbide nanosheets with a wrinkled structure and its application in electrochemical energy storage. Background technique [0002] As an important class of two-dimensional materials, transition metal carbides, nitrides, and carbonitrides (MXenes) have been extensively reported. MAX is expressed as M n+1 AX n (n=1-3), where M represents an early transition metal (such as Sc, Ti, Zr, V, Nb, Cr, Mo), A is a group III or IV element, and X is C or N. Typically, MXene is prepared by selectively etching the A layer from ternary carbide or nitride MAX. In 2011, Gogotsi and his team first reported the etching of Ti with HF 3 AlC 2 Al in the preparation of graphene-like Ti 3 C 2 . Spontaneous intercalation of Ti by polar organic molecules and metal ions 3 C 2 , can show its different performance from MAX. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/26H01G11/30H01G11/86
Inventor 赵为为彭佳丽赵强刘淑娟黄维
Owner NANJING UNIV OF POSTS & TELECOMM
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