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Method for preparing NiCo hydrotalcite/foamed nickel composite material by taking Co-MOF as sacrificial template

A technology of composite materials and nickel foam, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of reducing the capacitance performance of active materials, poor conductivity of hydrotalcite, and poor conductivity, so as to improve conductivity and large The effect of specific surface area and easy operation

Pending Publication Date: 2022-04-26
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the hydrotalcite composite powder is easy to agglomerate, the conductivity is poor, and the use of a binder to prepare the electrode significantly affects the reduction of the capacitance performance of the active material. / Foam nickel composite material method, this method can inherit the structure and performance advantages of MOF and hydrotalcite, solve the problems of poor electrical conductivity of hydrotalcite, and has broad application prospects

Method used

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  • Method for preparing NiCo hydrotalcite/foamed nickel composite material by taking Co-MOF as sacrificial template
  • Method for preparing NiCo hydrotalcite/foamed nickel composite material by taking Co-MOF as sacrificial template
  • Method for preparing NiCo hydrotalcite/foamed nickel composite material by taking Co-MOF as sacrificial template

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Foam nickel pretreatment: the foam nickel is cut to an area of ​​2cm 2 Rectangular nickel foam, first place the cut nickel foam in acetone solution for 3 minutes, then use 1M HCl for 4 minutes, and finally use absolute ethanol for 5 minutes, and dry it in an oven at 60°C for 12 hours;

[0030] (2) Precursor Co-MOF / nickel foam preparation: Dissolve 3mmol cobalt nitrate in 60ml deionized water, and stir magnetically at a speed of 500rpm for 10min; dissolve 24mmol 2-methylimidazole in 60ml deionized water, Rotating speed is carried out magnetic stirring 10min; 2-methylimidazole solution is poured in the cobalt nitrate solution, forms mixed solution, mixed solution is carried out magnetic stirring 15min with the rotating speed of 800rpm; The foamed nickel that pretreated is placed in mixed solution, and The mixed solution was left standing or stirred at a speed not greater than 500 rpm for 8 hours at a temperature of 25°C. The nickel foam grown on Co-MOF was repeatedly...

Embodiment 2

[0034] (1) Foam nickel pretreatment: the foam nickel is cut to an area of ​​2cm 2 Rectangular nickel foam, first place the cut nickel foam in acetone solution for 3 minutes, then use 1M HCl for 4 minutes, and finally use absolute ethanol for 5 minutes, and dry it in an oven at 60°C for 12 hours;

[0035] (2) Precursor Co-MOF / nickel foam preparation: Dissolve 3mmol cobalt nitrate in 60ml deionized water, and stir magnetically at a speed of 500rpm for 10min; dissolve 24mmol 2-methylimidazole in 60ml deionized water, Rotating speed is carried out magnetic stirring 10min; 2-methylimidazole solution is poured in the cobalt nitrate solution, forms mixed solution, mixed solution is carried out magnetic stirring 15min with the rotating speed of 800rpm; The foamed nickel that pretreated is placed in mixed solution, and The mixed solution was left standing or stirred at a speed not greater than 500 rpm for 8 hours at a temperature of 25°C. The nickel foam growing Co-MOF was cleaned wit...

Embodiment 3

[0039] 1) Pretreatment of foamed nickel: cutting the foamed nickel to an area of ​​2cm 2 Rectangular nickel foam, first place the cut nickel foam in acetone solution for 3 minutes, then use 1M HCl for 4 minutes, and finally use absolute ethanol for 5 minutes, and dry it in an oven at 60°C for 12 hours;

[0040] 2) Precursor Co-MOF / nickel foam preparation: Dissolve 3mmol cobalt nitrate in 60ml deionized water and stir magnetically at 500rpm for 10min; dissolve 24mmol 2-methylimidazole in 60ml deionized water and stir at 500rpm Perform magnetic stirring for 10 min; pour 2-methylimidazole solution into cobalt nitrate solution to form a mixed solution, and magnetically stir the mixed solution at a speed of 800 rpm for 15 min; place the pretreated nickel foam in the mixed solution, and mix The solution was left standing or stirred at a speed not greater than 500 rpm for 8 hours at a temperature of 25°C. The nickel foam grown on Co-MOF was treated with deionized water and dried in ...

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Abstract

The invention discloses a method for preparing a NiCo hydrotalcite / foamed nickel composite material by using Co-MOF as a sacrificial template, which comprises the following steps: preparation of a Co-MOF / foamed nickel template: respectively preparing cobalt nitrate and 2-methylimidazole into aqueous solutions, mixing, placing treated foamed nickel in the mixed solution, reacting at a proper temperature for a period of time, washing with water, and drying to obtain the Co-MOF / foamed nickel template; the reacted foamed nickel is cleaned with deionized water and dried in a drying oven, and a Co-MOF / foamed nickel template is obtained; the preparation process of the NiCo hydrotalcite / foamed nickel composite material comprises the following steps: preparing nickel nitrate into an aqueous solution, putting Co-MOF / foamed nickel into the nickel nitrate solution, and reacting for a period of time at a proper temperature to obtain the target product NiCo hydrotalcite / foamed nickel composite material. The prepared composite material can be directly used as an electrode material, use of a binder is avoided, a large number of active sites are increased, the electrode conductivity can be improved, ion transmission is promoted, and the capacitive performance of the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode material preparation, and specifically relates to a method for preparing NiCo hydrotalcite / foam nickel composite material with Co-MOF as a sacrificial template, in which a cobalt-based metal-organic framework compound is grown in situ on the foam nickel, and then cobalt NiCo hydrotalcite / nickel foam composite electrode materials were prepared using metal-organic framework compounds as sacrificial templates. Background technique [0002] As a promising energy storage device, supercapacitors have attracted widespread attention because of their high power density, fast charging speed, and good cycle stability. Compared with batteries, they not only have higher power, but also have higher power than traditional Capacitors have more storage capacity. Hydrotalcite is a layered double hydroxide (LDH), which has an open layered structure, a high specific surface area, a large number of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/30
CPCH01G11/86H01G11/30
Inventor 王晓亮张多
Owner LIAONING TECHNICAL UNIVERSITY
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