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Method for synthesizing ZIF-8-based ternary composite ZnO/ZnCo2O4/NiO by solvothermal process and application of method

A ZIF-8, ternary composite technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of easy collapse of structure and limited shape, and achieve the effect of small degree of separation, good shape and excellent electrochemical performance.

Active Publication Date: 2018-11-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still challenging to produce multi-component composites with highly symmetric geometries due to the limited morphology of MOFs precursors and the easy structure collapse.

Method used

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  • Method for synthesizing ZIF-8-based ternary composite ZnO/ZnCo2O4/NiO by solvothermal process and application of method
  • Method for synthesizing ZIF-8-based ternary composite ZnO/ZnCo2O4/NiO by solvothermal process and application of method
  • Method for synthesizing ZIF-8-based ternary composite ZnO/ZnCo2O4/NiO by solvothermal process and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse 290 mg of ZIF-8 in 60 mL of ethanol containing 2 mmol of cobalt nitrate and 421 mg of cyclohexamethylenetetramine, stir to dissolve it completely, transfer the solution to a 100 mL reaction kettle, and keep it in an oven at 120 ° C for 2 h. The reactor was taken out of the oven, and when it was cooled to room temperature, it was collected by centrifugation and dried at 60°C for 12 hours to obtain the precursor. Then in air at 350°C at 2°C min -1 The precursor was annealed for 2h at a rate of 2h to obtain a binary composite ZnO / ZnCo based on ZIF-8 2 o 4 .

[0026]Disperse 290 mg of ZIF-8 in 60 mL of ethanol containing 2 mmol of nickel nitrate and 421 mg of cyclohexamethylenetetramine, stir to dissolve it completely, transfer the solution to a 100 mL reaction kettle, and keep it in an oven at 120 ° C for 2 h. The reactor was taken out of the oven, and when it was cooled to room temperature, it was collected by centrifugation and dried at 60°C for 12 hours to o...

Embodiment 2

[0032] Disperse 290 mg of ZIF-8 in 60 mL of ethanol containing 2 mmol of cobalt nitrate and 421 mg of cyclohexamethylenetetramine, stir to dissolve it completely, transfer the solution to a 100 mL reaction kettle, and keep it in an oven at 120 ° C for 2 h. The reactor was taken out of the oven, and when it was cooled to room temperature, it was collected by centrifugation and dried at 60°C for 12 hours to obtain the precursor. Then in air at 350°C at 2°C min -1 The precursor was annealed for 2h at a rate of 2h to obtain a binary composite ZnO / ZnCo based on ZIF-8 2 o 4 .

[0033] Disperse 290 mg of ZIF-8 in 60 mL of ethanol containing 2 mmol of nickel nitrate and 421 mg of cyclohexamethylenetetramine, stir to dissolve it completely, transfer the solution to a 100 mL reaction kettle, and keep it in an oven at 120 ° C for 2 h. The reactor was taken out of the oven, and when it was cooled to room temperature, it was collected by centrifugation and dried at 60°C for 12 hours to ...

Embodiment 3

[0036] Disperse 290 mg of ZIF-8 in 60 mL of ethanol containing 2 mmol of cobalt nitrate and 421 mg of cyclohexamethylenetetramine, stir to dissolve it completely, transfer the solution to a 100 mL reaction kettle, and keep it in an oven at 120 ° C for 2 h. The reactor was taken out of the oven, and when it was cooled to room temperature, it was collected by centrifugation and dried at 60°C for 12 hours to obtain the precursor. Then in air at 350°C at 2°C min -1 The precursor was annealed for 2h at a rate of 2h to obtain a binary composite ZnO / ZnCo based on ZIF-8 2 o 4 .

[0037] Disperse 290 mg of ZIF-8 in 60 mL of ethanol containing 2 mmol of nickel nitrate and 421 mg of cyclohexamethylenetetramine, stir to dissolve it completely, transfer the solution to a 100 mL reaction kettle, and keep it in an oven at 120 ° C for 2 h. The reactor was taken out of the oven, and when it was cooled to room temperature, it was collected by centrifugation and dried at 60°C for 12 hours to ...

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Abstract

The invention belongs to the technical field of metal organic framework materials, and relates to a method for preparing a ternary composite material by using zeolitic imidazolate frameworks as a template, in particular to a method for synthesizing a ZIF-8-based ternary composite ZnO / ZnCo2O4 / NiO by a solvothermal process and application of the method. The method disclosed by the invention comprises: dispersing per 290 mg of ZIF-8 polyhedron in 30-90 mL of ethanol containing 0.6-1.4 mmol of nickel nitrate, 0.6-1.4 mmol of cobalt nitrate and 421 mg of hexamethylenetetramine, stirring and mixinguniformly, transferring to a reaction kettle, heating at 100 DEG C to 120 DEG C for 2-4 h, cooling to room temperature, collecting by centrifugation and drying at 60 DEG C to 80 DEG C for 12-24 h to obtain a precursor, and annealing the precursor in the air at 300-350 DEG C by rate of 2 DEG C.min<-1> for 2-3 h, so the ternary composite ZnO / ZnCo2O4 / NiO is obtained. The prepared ZIF-8-based ternarycomposite ZnO / ZnCo2O4 / NiO has uniform particle distribution and good particle size dispersion, and has excellent electrochemical performance and good cycling stability when being used as an electrodematerial of a supercapacitor. The method has the advantages of simple process, low preparation cost and less pollution, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework materials, and relates to the preparation of ternary composite materials using zeolite imidazolate framework as a template, in particular to the solvothermal synthesis of ZnO / ZnCo based on ZIF-8 2 o 4 / NiO method and its application. Background technique [0002] Recently, metal-organic framework materials have attracted great interest of researchers, which are organic-inorganic hybrid frameworks with infinitely extended uniform structures formed by organic ligands and inorganic metal (or metal-containing clusters) sites. Material. Due to the diversity of structure and function, metal-organic framework materials have shown potential application value in many fields such as gas adsorption and separation, electrochemistry and sensing, drug delivery, etc., and become a research hotspot in the scientific community. Based on the geometric patterns of organic ligands coordinated to me...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/46
CPCH01G11/24H01G11/30H01G11/46Y02E60/13
Inventor 周赛赛胡思忠郝臣王晓红竹林李黄成相高海文
Owner JIANGSU UNIV
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