Core-shell structure composite material composed of transition metal oxide grown on nickel foam in situ and metal organic skeleton

A metal-organic framework and in-situ growth technology, applied in the field of materials science, can solve problems such as poor electronic conductivity, and achieve the effects of easy operation, easy operation, and increased specific capacitance

Inactive Publication Date: 2019-04-19
LIAONING UNIVERSITY
3 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] Aiming at a series of shortcomings such as poor electronic conductivity of the existing transition metal oxides, the purpose of the present invention i...
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Abstract

The invention relates to core-shell structure composite material composed of a transition metal oxide grown on nickel foam in situ and a metal organic skeleton. The preparation method of the core-shell structure composite material includes the steps: preparing a self-assembled flower-like CoO cluster of nanowire arrays grown on nickel foam, then preparing ZIF-67@CoO with a core-shell structure, grown on the nickel foam, and finally preparing Co/C-N@CoO with a core-shell structure, grown on the nickel foam. Compared with the prior art, the preparation method has high purity, good dispersibilityand controllability in the prepared products, is simple the process steps and is easy to operate. The prepared transition metal oxide and metal organic skeleton composite material with the core-shellstructure is grown on the nickel foam substrate, can be directly used as an electrode material of a supercapacitor, has excellent capacitance performance, and can be applied to high stability, wearable electronic devices and other occasions.

Application Domain

Hybrid capacitor electrodesHybrid/EDL manufacture

Technology Topic

Flower likeCapacitance +14

Image

  • Core-shell structure composite material composed of transition metal oxide grown on nickel foam in situ and metal organic skeleton
  • Core-shell structure composite material composed of transition metal oxide grown on nickel foam in situ and metal organic skeleton
  • Core-shell structure composite material composed of transition metal oxide grown on nickel foam in situ and metal organic skeleton

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0034] Example 1 Core-shell structure composite material composed of transition metal oxide and metal organic framework grown in situ on nickel foam (1) Preparation of CoO@Ni:
[0035] Add 0.05mmol of cobalt nitrate, 0.3mmol of urea, and 0.2mmol of ammonium fluoride to 2mL of deionized water, stir and mix uniformly to obtain a mixture, add clean foamed nickel (1×1.5cm 2 ) Immerse into the mixed solution, and then transfer the foamed nickel and the mixed solution to a polytetrafluoroethylene autoclave with a volume of 10 mL. Seal the reaction kettle and put it in the oven. Heating makes the temperature of the oven from room temperature to 100℃, the heating rate is 2℃ min -1 , And keep the temperature under this condition for 10 hours. Slowly cool to room temperature and let stand for at least 1 day to obtain dark red precipitate-coated nickel foam; filter, wash with water and ethanol successively, and dry in air at 60°C for 6 hours, transfer the resulting product to a tube furnace, and heat up Calcined at 350°C for 1 hour to obtain CoO grown on foamed nickel, which is a self-assembled flower-like CoO cluster of nanowire arrays grown on foamed nickel, labelled CoO@Ni.
[0036] (2) Preparation of ZIF-67@CoO@Ni:
[0037] Add 10 mmol of 2-methylimidazole to a mixed solution of 5 mL of ethanol and 5 mL of water, and sonicate for 10 minutes to obtain a reaction solution. Dip CoO@Ni into the reaction solution and transfer it to a glass bottle with a volume of 25 mL. The glass bottle was capped and sealed, and allowed to stand at room temperature for 24 hours to obtain foamed nickel coated with purple precipitate. Wash with water and ethanol successively, and dry in a vacuum drying oven at 80°C for 12 hours to obtain ZIF-67@CoO grown on foamed nickel, labeled ZIF-67@CoO@Ni.
[0038] (3) Preparation of Co/C-N@CoO@Ni:
[0039] Transfer ZIF-67@CoO@Ni to a porcelain boat, place it in a tube furnace, under the protection of argon gas, and firstly raise the temperature to 350℃ at a rate of 4℃ min -1 , Calcined for 3h, then continue heating to 500℃, heating rate is 4℃ min -1 , Calcined for 2 hours and lowered to room temperature to obtain Co/C-N@CoO composite material grown on foamed nickel, labeled Co/C-N@CoO@Ni.

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