CuCo-BDC ultrathin nanosheet, preparation method and application thereof

A nanosheet, ultra-thin technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex operation, poisonous and harmful, low yield, etc., and achieve simple operation and high conductivity , the effect of high yield

Pending Publication Date: 2021-11-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the current methods for synthesizing ultra-thin nanosheets of two-dimensional MOFs, the commonly used solvothermal method is complicated to operate, takes a long time, is high in cost and low in yield, and is toxic and harmful.

Method used

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  • CuCo-BDC ultrathin nanosheet, preparation method and application thereof
  • CuCo-BDC ultrathin nanosheet, preparation method and application thereof
  • CuCo-BDC ultrathin nanosheet, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of 10Cu / 90Co-BDC ultra-thin nanosheets specifically comprises the following steps:

[0029] First, dissolve 125.86mg of terephthalic acid in a mixed solution of 12ml N,N-dimethylformamide, 2ml of absolute ethanol, and 2ml of deionized water, then dissolve 10ml of N,N-dimethylformamide solution Add 12.91mg of copper chloride dihydrate and 162mg of cobalt chloride hexahydrate dissolved in 10ml of N,N-dimethylformamide solution to the above solution in sequence, and after ultrasonication, add dropwise at a rate of 48ml / h while stirring the above solution Triethylamine, after stirring for five minutes, stop the dropwise addition, ultrasonic for 8 hours, use ethanol at 2500r / min to centrifuge and wash 3 times, then dry in an oven at 80°C to obtain pink powder 10Cu / 90Co-BDC ultrathin nanosheets.

[0030] figure 1 Low-magnification (a) and high-magnification (b) FESEM images of the bimetallic organic framework 10Cu90Co-BDC prepared for this example, th...

Embodiment 2

[0032] The preparation method of 30Cu / 70Co-BDC ultra-thin nanosheets, the specific steps are similar to Example 1, the difference is that the mass of copper chloride dihydrate is 38.75 mg, and the mass of cobalt chloride hexahydrate is 126.17 mg.

[0033] figure 2 The low-magnification (a) and high-magnification (b) FESEM photos of the bimetallic organic framework 30Cu70Co-BDC prepared for this example, compared with 10Cu90Co-BDC, the three-dimensional sense of space becomes worse, and the thickness also increases.

Embodiment 3

[0035] The preparation method of Cu-BDC ultra-thin nanosheets specifically comprises the following steps:

[0036] First, dissolve 125.86mg of terephthalic acid in a mixed solution of 12ml N,N-dimethylformamide, 2ml of absolute ethanol, and 2ml of deionized water, and then dissolve 20ml of N,N-dimethylformamide solution 129.15 mg of copper chloride dihydrate was added to the above solution, and after ultrasonication was uniform, triethylamine was added dropwise to the above mixed solution at a rate of 48ml / h, stirred for five minutes, ultrasonicated for 8 hours, and centrifuged with ethanol at a speed of 2500r / min for 3 After drying in an oven at 80°C, powdered Cu-BDC ultrathin nanosheets were obtained.

[0037] image 3 Low-magnification (a) and high-magnification (b) FESEM images of the metal-organic framework Cu-BDC prepared for this example, and its morphology is a uniform ribbon.

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Abstract

The invention discloses a CuCo-BDC ultrathin nanosheet, a preparation method and application thereof. The preparation method comprises the following steps: dissolving copper chloride dihydrate, cobalt chloride hexahydrate and terephthalic acid in a mixed solution of N, N-dimethylformamide, ethanol and deionized water in an ultrasonic manner; and stirring the solution obtained in the previous step, adding triethylamine in a stirring state, then putting the solution into an ultrasonic machine for ultrasonic treatment, then centrifuging, cleaning the product obtained after centrifuging with ethanol multiple times, and drying to obtain Cu / Co-BDC powder, namely the CuCo-BDC ultrathin nanosheet. According to the invention, the Cu / Co-BDC ultrathin nanosheet with the optimal performance is obtained by regulating and controlling the proportion of metal elements, and then the Cu / Co-BDC ultrathin nanosheet is directly used as a lithium ion battery negative electrode material, wherein the average discharge potential of the material is improved by doping Cu<2+> ions, the Cu<2+> ions and Co<2+> form a bimetal organic framework, and the electrochemical lithium storage performance of the material is further improved through the coordination effect of bimetal ions.

Description

technical field [0001] The invention relates to the technical field of preparation of nano functional materials, in particular to a CuCo-BDC ultra-thin nano sheet and its preparation method and application. Background technique [0002] Metal-organic frameworks (MOFs) are composed of metal ions and organic ligands. They have the advantages of diverse types and structures, large specific surface area, and adjustable pore structure. They also have the unique functions of host metal ions and guest organic ligands. Storage shows unique advantages and application prospects. For example, MOFs can achieve controllable porosity by keeping the metal ions constant and introducing ligands with different carbon chain lengths; or by keeping the organic ligands constant and regulating the metal ions, MOFs with similar or completely different structures can be obtained. As an electrode material, a large specific surface area and a controllable pore structure are crucial for storing active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M10/0525B82Y30/00
CPCH01M4/60H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 崔接武张会龙吴玉程余东波王岩张勇
Owner HEFEI UNIV OF TECH
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