Three-dimensional cross-linked structure MXene material and preparation method thereof

A technology of three-dimensional cross-linking and three-dimensional structure, which is applied in the field of electrochemical energy storage, can solve the problems of long ion transmission path and achieve the effects of shortening the transmission distance, benefiting long-term storage and good electronic conductivity

Pending Publication Date: 2019-10-18
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to propose a two-dimensional MXene material in order to solve the self-stacking phenomenon of MXene two-dimensional nanosheets (2D-MXene) during storage and application, and the problem that ions have a long transmission path in its electrodes. Three-dimensional preparation method, called spray-lyophilization method

Method used

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  • Three-dimensional cross-linked structure MXene material and preparation method thereof
  • Three-dimensional cross-linked structure MXene material and preparation method thereof
  • Three-dimensional cross-linked structure MXene material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1: Make 2D-MXene nanosheets ultrasonically into a dispersion with 1-20 layers, with a concentration of 0.5-5 mg / mL;

[0042] Step 2: Spray the solution obtained in Step 1 into the boiling liquid nitrogen with droplets with a diameter of 100 μm to 5000 μm through a high-pressure gun;

[0043] Step 3: After the liquid nitrogen in step 2 is volatilized and dried, the obtained product is subjected to freeze-drying treatment to obtain 3D-MXene with a non-stack structure.

Embodiment 2

[0045] This embodiment is basically the same as step 1 of embodiment, the difference is that in step 1, MXene is selected as 2D-Ti 3 C 2 T x And be made into the solution of 2mg / ml; In step 2, spray the droplet that is 100 μ m in diameter into liquid nitrogen; And the obtained 3D-Ti 3 C 2 T x The material uses NMP as a solvent to obtain a porous electrode by means of stirring and coating.

[0046] figure 2 3D-Ti with crosslinked spherical and tubular structures prepared for this example 3 C 2 T x ,and figure 1 In stark contrast to the original morphology in

[0047] Figure 5 Porous 3D-Ti prepared for this example 3 C 2 T x Electrodes and pristine 2D-Ti 3 C 2 T x Stacked electrodes made of materials; where (a) (b) is porous 3D-Ti 3 C 2 T x , (c)(d) is the stacked 2D-Ti 3 C 2 T x .

[0048] Figure 6 Porous 3D-Ti prepared for this example 3 C 2 T x Electrode with pristine 2D-Ti 3 C 2 T x Comparison of the rate performance of electrodes prepared f...

Embodiment 3

[0050] The steps of this embodiment are basically the same as those of Embodiment 2, except that the concentration in step 1 is changed to 4 mg / ml. The 3D-Ti prepared in this example 3 C 2 T x Three-dimensional wrinkled shape. The wrinkled 3D-Ti prepared in this example 3 C 2 T x Such as image 3 As shown, the curling of the nanosheets was not complete due to the high concentration.

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Abstract

The invention provides a three-dimensional cross-linked structure MXene material and a preparation method thereof. The spray-freeze drying method adopted by the invention includes: preparing 2D-MXenenanosheets into a 0.5-5mg / mL dispersion liquid of 1-20 layers in an ultrasonic way; spraying the solution obtained in step 1 into liquid-boiling liquid nitrogen by a high pressure gun in the form of liquid droplets with a diameter of 100microm-5000microm; and volatilizing and drying of the liquid nitrogen in step 2, subjecting the obtained product to freeze drying treatment, thus obtaining non-heap structure 3D-MXene. The 3D-MXene prepared by the method provided by the invention presents the spherical, tubular and other shapes of a cross-linked structure, and can successfully solve the stacking problem of 2D-MXene nanosheets and retain a large specific surface area and the number of exposed active sites. The 3D-MXene prepared by the method provided by the invention is independent of each other and has different orientations, and is beneficial for long-term preservation and reuse.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to an MXene material with a three-dimensional crosslinked structure and a preparation method thereof. Background technique [0002] MXene, an umbrella term for transition metal carbides / carbonitrides / nitrides, is the newest and represents an important group of two-dimensional layered materials characterized by metal-carbon and / or nitrogen-hosted layers with / Does not have functional groups. This unique structure is derived from the parent phase of the ceramic material M n+1 AX n Phase derived, specifically obtained by selectively separating the most active part (ie, A, IIIA or IVA group elements). 1 Among them, the coordination number of transition metal ions is generally 6, forming six chemical bonds with adjacent X atoms and chemical groups attached to the surface, and finally presenting M n+1 x n T x structure. Thus, a very large set of MXenes with different s...

Claims

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Application Information

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IPC IPC(8): C01B32/90C01B21/082C01B21/06B82Y30/00B82Y40/00
CPCC01B32/90C01B21/06C01B21/082B82Y30/00B82Y40/00C01P2004/61
Inventor 曹殿学方永正朱凯贺峒铜谢泽宇闫俊程魁叶克王贵领
Owner HARBIN ENG UNIV
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