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Zinc cobaltate nanosheet array/foamed nickel combined electrode, preparation method and application thereof

A composite electrode, nickel foam technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology and other directions, can solve the problems of no nanorod array, unsatisfactory specific capacitance value, etc., to improve the utilization rate , improve the utilization rate and conductivity, and facilitate the effect of electron transfer

Inactive Publication Date: 2013-12-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zinc cobaltate nanorods obtained by this method do not grow in an orderly manner on the surface of the nickel foam, and no nanorod array is formed, and the specific capacitance obtained when the composite electrode is used as a supercapacitor working electrode is not ideal. especially at high current densities

Method used

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  • Zinc cobaltate nanosheet array/foamed nickel combined electrode, preparation method and application thereof
  • Zinc cobaltate nanosheet array/foamed nickel combined electrode, preparation method and application thereof
  • Zinc cobaltate nanosheet array/foamed nickel combined electrode, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Step 1: Dissolve 0.5mmol zinc nitrate, 1mmol cobalt nitrate, 2.5mmol ammonium fluoride and 5mmol urea in a mixed solution composed of 60mL deionized water and 40mL ethanol at room temperature, and stir evenly;

[0028] Step 2: Pour the above solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, and at the same time immerse the cleaned and dried foamed nickel into the solution, seal the reaction kettle, and put the reaction kettle at 120°C reacted in an oven for 4 hours, cooled naturally, took out and washed several times with water and ethanol respectively, and dried to obtain foamed nickel with nanosheet arrays;

[0029] Step 3: put the above-mentioned nickel foam with nanosheet arrays into a muffle furnace for calcination at 350° C. for 2 hours to obtain a zinc cobaltate nanosheet array / nickel foam composite electrode.

[0030] from SEM figure 1 , figure 2 with image 3 It can be seen that the zinc cobaltate nanosheet array is obtained, an...

Embodiment 2

[0032] Step 1: Dissolve 0.5mmol zinc nitrate, 1mmol cobalt nitrate, 2.5mmol ammonium fluoride and 5mmol urea in a mixed solution composed of 40mL deionized water and 60mL methanol at room temperature, and stir evenly;

[0033] Step 2: Pour the above solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, and at the same time immerse the cleaned and dried foamed nickel into the solution, seal the reaction kettle, and put the reaction kettle at 120°C react in an oven for 4.5 hours, cool naturally, take out and wash with water and ethanol several times, and dry to obtain foamed nickel with nanosheet arrays;

[0034] Step 3: put the above-mentioned nickel foam with nanosheet arrays into a muffle furnace for calcination at 350° C. for 4 hours to obtain a zinc cobaltate nanosheet array / nickel foam composite electrode.

[0035] The nanosheet array obtained under the conditions of Example 2 is basically the same as that of Example 1.

Embodiment 3

[0037] Step 1: Dissolve 0.5mmol zinc nitrate, 1mmol cobalt nitrate, 2.5mmol ammonium fluoride and 5mmol urea in a mixed solution composed of 50mL deionized water and 50mL isopropanol at room temperature, and stir evenly;

[0038] Step 2: Pour the above solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, and at the same time immerse the cleaned and dried foamed nickel into the solution, seal the reaction kettle, and put the reaction kettle at 120°C reacted in an oven for 4 hours, cooled naturally, took out and washed several times with water and ethanol respectively, and dried to obtain foamed nickel with nanosheet arrays;

[0039] Step 3: put the above-mentioned nickel foam with nanosheet arrays into a muffle furnace for calcination at 500° C. for 2 hours to obtain a zinc cobaltate nanosheet array / nickel foam composite electrode.

[0040] The nanosheets obtained under the conditions of Example 3 are basically the same as those obtained in Example 1, ...

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Abstract

The invention discloses a zinc cobaltate nanosheet array / foamed nickel combined electrode, a preparation method and application of the zinc cobaltate nanosheet array / foamed nickel combined electrode, and belongs to the technical field of energy storage. The preparation method particularly comprises the steps of dissolving zinc nitrate, cobalt nitrate, ammonium fluoride and urea into a mixing solution composed of deionized water and alcohol (one or more kinds of methyl alcohol, ethyl alcohol or isopropyl alcohol), evenly mixing, then immersing foamed nickel into the solution, carrying out hydrothermal reaction, and obtaining the zinc cobaltate nanosheet array / foamed nickel combined electrode after natural cooling, washing drying and calcination. Zinc cobaltate nanosheets obtained through the preparation method perpendicularly or slantly grow on the surface of the foamed nickel and are firmly combined with the foamed nickel, the zinc cobaltate nanosheets and the foamed nickel are mutually connected to form a nanosheet array, therefore, the contact areas between an electrolyte and the nanosheets are increased, and the stability of the nanosheet array and the stability of the whole electrode are further improved. When the zinc cobaltate nanosheet array / foamed nickel combined electrode is tested as the work electrode of a supercapacitor, the high specific capacitance and the cycling stability can still be achieved under the large current density condition.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a zinc cobaltate nanosheet array / nickel foam composite electrode, a preparation method and its application in the field of supercapacitors. Background technique [0002] With global warming, increasing depletion of fossil fuels, and environmental pollution, it is increasingly urgent to find an effective, clean and sustainable energy source, as well as corresponding energy storage and conversion technologies. As a new generation of energy storage and conversion devices, supercapacitors, also known as electrochemical capacitors, have attracted more and more attention from scientists because of their outstanding advantages such as high safety, fast charge and discharge, and long cycle life. [0003] However, the low energy density of supercapacitors greatly limits its application in the energy field. Therefore, how to increase the energy density of supercapacitor...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24B82Y40/00
CPCY02E60/13
Inventor 刘晓旸包福喜
Owner JILIN UNIV
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