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Method for manufacturing supercapacitor material by coating MOF (metal organic frame) with dopamine

A supercapacitor and dopamine technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of poor stability and insufficient electrochemical activity, and achieve the effects of good performance, easy promotion and excellent electrochemical performance.

Inactive Publication Date: 2019-05-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above supercapacitor materials still have problems such as insufficient electrochemical activity and poor stability in alkaline environments.

Method used

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  • Method for manufacturing supercapacitor material by coating MOF (metal organic frame) with dopamine
  • Method for manufacturing supercapacitor material by coating MOF (metal organic frame) with dopamine
  • Method for manufacturing supercapacitor material by coating MOF (metal organic frame) with dopamine

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preparation example Construction

[0036] As introduced in the background art, the current supercapacitor materials still have the problems of insufficient electrochemical activity and poor stability in an alkaline environment. Therefore, the present invention proposes a method for making supercapacitor materials by coating MOF with dopamine. Using bimetallic MOF as a template and raw material, after dopamine-coated vulcanization, it becomes a stable hollow structure Zn x co 1-x S@C (x=0.01~1.0), as a high-performance supercapacitor cathode material, the specific preparation method includes the following steps:

[0037] a. Preparation of ZnCo-MOF precursor at room temperature;

[0038] b. Disperse the prepared ZnCo-MOF in the solution for dopamine coating;

[0039] c. Collect the coated product for annealing treatment;

[0040] d. Sulfurize the annealed product to obtain Zn x co 1-x S@C (x=0.01~1.0) hollow structure.

[0041] The specific steps for preparing the ZnCo-MOF precursor at room temperature des...

Embodiment 1

[0052] Add 0.291 g of cobalt nitrate hexahydrate and 0.595 g of zinc nitrate hexahydrate into 25 mL of methanol, and stir to form a uniform solution. Add 0.985 g of dimethylimidazole into 15 mL of methanol and stir to form a homogeneous solution. The methanol solution of dimethylimidazole was added dropwise to the nitrate solution and stirred continuously to form a homogeneous solution and then left to stand for 24 hours to obtain a precipitate; the precipitate was collected by centrifugation and washed three times with methanol to obtain the ZIF-8 precursor.

[0053] 130 mg of ZnCo-MOF precursor was added to 100 mL of Tris-HCL buffer (PH=8.5) containing 100 mg of dopamine, and stirred for 24 h after ultrasonication for 2 minutes. The precipitate was collected by centrifugation, washed with deionized water and ethanol in turn, and dried at 60° C. for 5 hours. The dried ZnCo-MOF@PDA polyhedron was heated to 600°C at a rate of 5°C per minute under the protection of nitrogen and...

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Abstract

The invention relates to a method for manufacturing a supercapacitor material by coating a MOF (metal organic frame) with dopamine, comprising the following steps: taking a bi-metal MOF as a template,coating with dopamine, annealing and vulcanizing to obtain a supercapacitor material of a Zn<x>Co<1-x>S@C (x = 0.01-1.0) hollow structure, wherein the bi-metal MOF contains two metal nodes of Zn andCo. According to the method in the invention, the bi-metal MOF is used as a template and a raw material, coating vulcanization with dopamine is carried out to form a stable hollow structure Zn<x>Co<1-x>S@C (x = 0.01-1.0), which is used as a high-performance supercapacitor positive electrode material, excellent performance is shown, the energy density is up to 55. 47 Wh kg<-1>, and the maximum power density which can be achieved is 16.55 kW kg<-1>.

Description

technical field [0001] The invention belongs to the field of supercapacitor manufacturing, and in particular relates to a method for making a supercapacitor material by coating MOF with dopamine. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the advantages of fast charging and discharging, high efficiency and good stability. It is a clean green energy and a new type of green energy in the 21st century, with great market potential and application prospects. It is different from traditional chemical power sources. It is a power source with special properties between traditional capacitors and batteries. It mainly relies on electric double layers and redox pseudocapacitive charges to store electrical energy. [0003] Metal-organic frameworks (MOFs) have gradually become an important building material for supercapacitors due to their diverse composition and structure, high specific surface area, and rich pore structure. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32
CPCY02E60/13
Inventor 司鹏超杨媛
Owner SHANDONG UNIV
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