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Preparation method and application of graphene oxide composite zinc-cobalt-nickel multi-metal hydroxide ternary composite material

A composite material, the technology of zinc nitrate hexahydrate, which is applied in the field of preparation of graphene oxide composite zinc-cobalt-nickel multi-metal hydroxide ternary composite materials, can solve the weakened electrochemical performance and the easy aggregation of hexagonal nanosheets and other problems, to achieve the effect of simple preparation method, favorable electrochemical performance and high diffusion rate

Active Publication Date: 2021-11-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is a problem that hexagonal nanosheets are easy to aggregate in LDHs, and its impact is finally manifested in the weakening of electrochemical performance, which can not be ignored for its application in supercapacitors.

Method used

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  • Preparation method and application of graphene oxide composite zinc-cobalt-nickel multi-metal hydroxide ternary composite material
  • Preparation method and application of graphene oxide composite zinc-cobalt-nickel multi-metal hydroxide ternary composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 656mg of 2-methylimidazole and 582mg of zinc nitrate hexahydrate were dissolved in 50ml of methanol respectively, and under the action of magnetic stirring, the methanol solution containing 656 mg of 2-methylimidazole was added dropwise to the solution containing 582mg of zinc nitrate hexahydrate. In the methanol solution, keep magnetic stirring for 30 min after the drop is complete. After the stirring was completed, pure ZIF-8 was prepared by aging at room temperature. After aging for 24 hours, the samples were finally collected by centrifugation, washed three times alternately with water and ethanol, and dried at 60°C for 12 hours to obtain pure ZIF-8.

Embodiment 2

[0031] A preparation method of GO / Zn-Co-Ni LDHs ternary composite material, comprising:

[0032] Dissolve 15 mg of graphene oxide synthesized by the improved Hummers method in 50 mL of methanol, and ultrasonicate for 1 hour to form a homogeneous solution. Weigh 582 mg of zinc nitrate hexahydrate and add to the above solution. After ultrasonication for 1 hour, the sample was taken out, and slowly and gradually added dropwise into 50 ml of a methanol solution containing 656 mg of 2-methylimidazole under magnetic stirring. After the addition was complete, magnetic stirring was performed for another 30 min, followed by aging at room temperature for 24 h. The final step is to collect the samples by centrifugation, wash alternately with water and ethanol three times, and dry at 60 °C for 12 h to obtain the precursor GO / ZIF-8.

[0033] Weigh 80 mg of the prepared template GO / ZIF-8 and add it into 100 mL of ethanol containing 200 mg of cobalt nitrate hexahydrate and 200 mg of nickel...

Embodiment 3

[0036] A preparation method of GO / Zn-Ni LDHs binary composite material, comprising:

[0037] Dissolve 15 mg of graphene oxide synthesized by the improved Hummers method in 50 mL of methanol, and ultrasonicate for 1 hour to form a homogeneous solution. Weigh 582 mg of zinc nitrate hexahydrate and add to the above solution. After ultrasonication for 1 hour, the sample was taken out, and slowly and gradually added dropwise into 50 ml of a methanol solution containing 656 mg of 2-methylimidazole under magnetic stirring. After the addition was complete, magnetic stirring was performed for another 30 min, followed by aging at room temperature for 24 h. The final step is to collect the samples by centrifugation, wash alternately with water and ethanol three times, and dry at 60 °C for 12 h to obtain the precursor GO / ZIF-8.

[0038] Weigh 80 mg of the prepared template GO / ZIF-8 and add it into 100 mL of ethanol containing 400 mg of nickel nitrate hexahydrate, stir for 3 min, and mak...

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Abstract

The invention belongs to the technical field of composite material preparation, and relates to a preparation method of a graphene oxide composite zinc-cobalt-nickel multi-metal hydroxide compound ternary composite material: first, the composite template GO / ZIF-8 is synthesized by an aging process, and then the GO / ZIF‑8 was added to ethanol containing cobalt nitrate hexahydrate and nickel nitrate hexahydrate, stirred evenly, and the ZIF‑8 template was etched away. Under the action of the precipitant, GO / Zn‑Co‑Co‑8 with a cotton-like fluffy structure was generated Ni LDHs ternary composites. The preparation method of the invention is simple and the cost is low. Thanks to the synergistic effect of multi-metal redox reaction and GO electric double layer effect, as well as the fluffy and porous interlaced structure of the material provides more orbits for the transport of electrons and ions, endows a more efficient diffusion rate, and ultimately promotes the formation of excellent electrochemical performance. Through electrochemical tests, it is found that the electrochemical performance of the prepared material is excellent, such as capacitance performance, rate performance and cycle stability performance, and can be used as an electrode material for a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to the preparation of electrode materials, in particular to a method for preparing a graphene oxide composite zinc-cobalt-nickel multimetal hydroxide compound (GO / Zn-Co-Ni LDHs) ternary composite material and its application. Background technique [0002] With the advancement of science and the development of the economy, there is an increasing demand for various electronic products, transportation, etc., and scientists realize that it is necessary to put energy conversion and energy storage on the agenda. Supercapacitors stand out among many energy storage components, which have the characteristics of high power output, fast charging and discharging, long life, and safe operation. Supercapacitors can be traditionally divided into two categories: one is the electric double-layer capacitor (EDLC) that relies on the large inner surface of the activated carbon mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/46H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 朱林李杨慧君叶招春周天天郝臣王晓红郭亚宁
Owner JIANGSU UNIV
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