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Method for growing hexagonal Co(OH)2 on surface of metal foamed nickel

A technology of metal foam and surface growth, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of complex preparation process, poor capacitance characteristics and high specific capacitance value, and achieve the effects of simple and easy control of reaction conditions, short drying process and low production cost.

Inactive Publication Date: 2014-06-25
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the insufficient dispersion of the sample and poor capacitance characteristics, the former cannot take advantage of the advantages of large porosity and high specific capacitance value of hydroxide drilled, but only simplifies the process; the samples of the latter two are nano-materials, which lead to Among them, the combination of the particles and the electrode matrix is ​​not firm, and a certain amount of conductive agent and binder need to be added, which makes the preparation process complicated.

Method used

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  • Method for growing hexagonal Co(OH)2 on surface of metal foamed nickel
  • Method for growing hexagonal Co(OH)2 on surface of metal foamed nickel
  • Method for growing hexagonal Co(OH)2 on surface of metal foamed nickel

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Experimental program
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Effect test

Embodiment 1

[0026] First put the weighed 0.8731g of cobalt nitrate hexahydrate and 0.1667g of ammonium fluoride into a beaker, then slowly add 9mL of ammonia solution with a mass fraction of 28% and 21mL of deionized water, the pH value is 12, and transfer to the hydrothermal reaction kettle In the liner; cut 2×3cm, metal foam nickel with a mass of 0.5g and put it into the above solution; and set the hydrothermal reaction temperature at 120°C, after 4 hours, take out the sample, and wash it with deionized water and absolute ethanol successively After washing, the sample was placed in a constant temperature drying oven at 60°C and taken out after 4 hours. The XRD test analysis shows that, in which β-Co(OH) 2 and the presence of metallic nickel ( figure 1 a). From scanning electron microscope pictures ( figure 1 b, c, d, e and f) It can be seen that the surface of the nickel foam is covered with hexagonal cobalt hydroxide sheets, the thickness is about 3.0um, and the hexagon side length ...

Embodiment 2

[0035] First put the weighed 2.1414g cobalt chloride hexahydrate and 0.5000g ammonium fluoride into the beaker, then slowly add 9mL ammonia solution with a mass fraction of 28% and 21mL deionized water, the pH value is 9, transfer to the hydrothermal reaction In the kettle liner; cut 2×3cm, metal foam nickel with a mass of 0.5g is put into the above solution; and set the hydrothermal reaction temperature at 150°C, after 2h, take out the sample, and successively wash with deionized water, anhydrous Wash with ethanol, place the sample in a constant temperature drying oven at 80°C, and take it out after 1 hour. From scanning electron microscope pictures ( Figure 4 It can be seen from a and b) that the surface of the nickel foam is covered with hexagonal cobalt hydroxide sheets, the thickness of which is about 5-10.0um, and the side length of the hexagon is about 20um. The electrochemical properties of the material were tested by the three-electrode method (electrolyte solution:...

Embodiment 3

[0039] First put the weighed 1.4555g cobalt nitrate hexahydrate, 2.3800g hexahydrate and cobalt chloride and 0.8385g ammonium fluoride into the beaker, then slowly add 45mL of ammonia solution with a mass fraction of 28% and a certain amount of deionized water, Add ammonium carbonate to adjust the pH value to 10, transfer it to the liner of the hydrothermal reaction kettle; cut 2×3cm, and put the metal foam nickel with a mass of 0.5g into the above solution; and set the hydrothermal reaction temperature to 130°C, and the time is After 4 hours, the sample was taken out, washed successively with deionized water and absolute ethanol, placed in a constant temperature drying oven at 70°C, and taken out after 2 hours. From scanning electron microscope pictures ( Figure 7 ) It can be seen that the hexagonal cobalt hydroxide sheet has a thickness of about 5.0um and a hexagonal side length of about 15um.

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Abstract

The invention relates to a method for growing hexagonal Co(OH)2 on the surface of metal foamed nickel. The method comprises the steps of firstly, preparing a cobalt source mother solution through soluble cobalt salt and ammonium fluoride, and then adjusting the pH value of the mother solution to range from 9 to 12; transferring the solution with the adjusted pH value into a hydrothermal reaction kettle, adding the metal foamed nickel used as a matrix, conducting a hydrothermal reaction at the temperature ranging from 110 DEG C to 180 DEG C for 1 h to 24 h, repeatedly conducting washing with deionized water and ethyl alcohol, conducting drying for 1 h to 4 h, and obtaining a hexagonal Co(OH)2 piece growing on the surface of the metal foamed nickel, wherein the thickness of the hexagonal Co(OH)2 piece ranges from 3 microns to 10 microns, and the side length of the hexagonal Co(OH)2 piece ranges from 10 microns to 20 microns. According to the method for growing the hexagonal Co(OH)2 on the surface of the metal foamed nickel, the structural advantage of the foamed nickel and the conductivity of metal nickel are fully utilized, the hexagonal Co(OH)2 is grown on the surface of the metal foamed nickel, the structure has the rapid ion and charge transfer capacity, and the charging and discharging properties are improved. Meanwhile, all hexagonal Co(OH)2 crystals are grown on the metal nickel, the effect of fixing the Co(OH)2 is achieved, and the obtained material can be directly used as an electrode material of a super capacitor.

Description

technical field [0001] The invention relates to a method of growing hexagonal Co(OH) on the surface of metal foam nickel 2 The method, which uses soluble cobalt salt as raw material, nickel foam as substrate, adopts hydrothermal synthesis method to prepare hexagonal Co(OH) 2 , especially relates to a supercapacitor electrode material Co(OH) 2 method of preparation. Background technique [0002] Developing energy-saving, emission-reducing, low-carbon and environmentally friendly new energy sources and building an environment-friendly society are the common needs of China and all countries in the world. Supercapacitors are a new type of clean and environmentally friendly energy storage device. Its electrical storage performance is between traditional capacitors and ordinary batteries. Compared with traditional capacitors, it has larger capacity, greater energy, wider operating temperature range and longer service life; compared with ordinary batteries, super Capacitors exh...

Claims

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Application Information

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IPC IPC(8): H01G11/46
CPCY02E60/13
Inventor 陈海锋唐培松潘国祥曹枫王坤燕张玉建
Owner HUZHOU TEACHERS COLLEGE
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