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Bimetal organic framework nanosheet and application thereof in supercapacitor

An organic framework and nanosheet technology, which is applied in the field of cobalt-containing ultra-thin bimetallic organic framework nanosheets and its preparation, can solve problems such as poor repeatability, insufficient stability of nanosheets, and difficult controllable synthesis of MOF nanosheets.

Inactive Publication Date: 2020-10-23
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve controllable synthesis of high-quality MOF nanosheets, and the currently obtained nanosheets are not stable enough and have poor reproducibility (J. Mater. Chem. A, 2017, 5, 18610)

Method used

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  • Bimetal organic framework nanosheet and application thereof in supercapacitor
  • Bimetal organic framework nanosheet and application thereof in supercapacitor
  • Bimetal organic framework nanosheet and application thereof in supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of bimetallic organic framework nanosheets

[0030] (1) Weigh 1 mmol Co(NO 3 ) 2 ·6H 2 O and 0.05 mmol M(NO 3 ) 2 ·nH 2 O (M is Mn, Zn, Cu, Ni) was dissolved in 30 mL of N,N-dimethylformamide and water (the volume ratio of the two was 1:1) and stirred by a magnetic stirrer After 15 minutes, the mixed reaction solution 1 was prepared.

[0031] (2) Weigh 4 mmol of 2-methylimidazole and dissolve in 30 mL of N, N-dimethylformamide and water (the volume ratio of the two is 1:1) mixed solution, and stir for 15 min with a magnetic stirrer , to prepare the mixed reaction solution 2.

[0032] (3) The mixed reaction solution 1 was poured into the mixed reaction solution 2 at one time, and stirred by a magnetic stirrer at room temperature for 24 hours to obtain the precipitate formed by the reaction.

[0033] (4) The precipitate was collected by centrifugation, washed with deionized water and ethanol, and then dried or dispersed in an ethanol solvent ...

Embodiment 2

[0036] Example 2 Preparation of electrode materials

[0037] Mix 85% bimetallic organic framework nanosheets and 15% acetylene black, and grind for 30 minutes, then add a few drops of isopropanol and grind for 15 minutes, add 1 drop of PTFE, and grind to form a slurry. 1.2 mg of this slurry was coated on nickel foam, and pressed at 5 kPa to obtain a working electrode.

Embodiment 3

[0038] Example 3 Electrochemical performance test.

[0039]A Hg / HgO electrode with 3.0 M KOH electrolyte and a platinum wire were used as the reference electrode and the counter electrode, respectively. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy were tested by electrochemical workstation CHI760E in 3.0 M KOH aqueous solution.

[0040] figure 1 It is the Fourier transform infrared (FT-IR) picture of the CoZn-MOF synthesized by the present invention. Strong and broad peak at 3250-3500cm -1 can be attributed to H 2 O-OH stretching vibration mode, at 1600-1700cm -1 The absorption peak of is regarded as the stretching vibration peak of C=C, and the FT-IR figure indirectly illustrates the successful synthesis of MOF materials.

[0041] figure 2 It is the scanning electron microscope (SEM) picture of the CoMn-MOF synthesized by the present invention. SEM images show that the synthesized CoMn-MOFs are all sheet-like structures...

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Abstract

The invention discloses a bimetal organic framework nanosheet and application thereof in a supercapacitor. The nanosheet is a Co-M bimetal organic framework nano-sheet, wherein M comprises manganese,iron, nickel, copper and zinc in a fourth period; the morphology of the nanosheet is a two-dimensional nanosheet; and the thickness is 2-5 nm. The bimetal organic framework nanosheet electrode material disclosed by the invention is prepared by a simple precipitation reaction; adopted raw materials are non-toxic, environment-friendly and low in cost, and a preparation process is simple, easy to operate and control and suitable for continuous large-scale production, the preparation process is green and environment-friendly, and tests prove that the ultrathin bimetal organic framework nanosheet shows good electricity storage performance when being applied to the supercapacitor.

Description

technical field [0001] The invention relates to a cobalt-containing ultrathin bimetallic organic framework nanosheet and a preparation method thereof. The ultrathin nanosheet can be used as a supercapacitor electrode material and belongs to the field of supercapacitor electrode material preparation. Background technique [0002] Supercapacitor refers to a new type of energy storage device between traditional capacitors and rechargeable batteries. It not only has the characteristics of fast charging and discharging of capacitors, but also has the energy storage characteristics of batteries. Its performance largely depends on the performance of the electrode material, and the performance of the electrode material is closely related to the microstructure and conductivity of the electrode material (Coordination Chemistry Reviews, 2018, 369, 15). Therefore, it is very important to develop new electrode materials. The development of supercapacitors will definitely improve the eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30C08G83/00
CPCH01G11/24H01G11/30C08G83/008Y02E60/13
Inventor 庞欢刘春丽柏杨
Owner YANGZHOU UNIV
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