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Preparation method for cobalt hydroxide film with nano-structure

A technology of cobalt hydroxide and nanostructure, applied in the field of nanomaterials, can solve the problems of uneven size, uncontrollable nano-Co particle size, poor flexibility, etc., and achieve the effects of short cycle, simple and easy operation of the preparation process, and low cost

Inactive Publication Date: 2012-02-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the prepared nano-Co(OH) 2 Uncontrollable particle size, uneven size, poor flexibility

Method used

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  • Preparation method for cobalt hydroxide film with nano-structure
  • Preparation method for cobalt hydroxide film with nano-structure
  • Preparation method for cobalt hydroxide film with nano-structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Use the glass slide as the substrate to ultrasonically wash each of nitric acid and ethanol for 30 minutes, rinse with distilled water, dry naturally at room temperature, and set aside;

[0028] 2) The solid Co(SO 4 ) 2 ·7H 2 O is dissolved in 200ml of water, and the molar concentration of Co(II) is obtained as Co(SO 4 ) 2 aqueous solution;

[0029] 3) To Co(SO 4 ) 2 Adding mass concentration to the aqueous solution is 40% hydrofluoric acid to adjust the atomic ratio of F and Co(II) in the solution to be 3:1;

[0030] 4) Slowly add ammonia water with a mass concentration of 35% to the mixed solution in step 3), and adjust the pH value of the solution to 8.9;

[0031] 5) Put the glass slide pretreated in step 1) vertically into step 4) to obtain the solution, and then place the reaction vessel in a water bath at 60° C. for 4 hours of standing reaction;

[0032] 6) Take out the glass slide covered with film, put it into distilled water and ultrasonically wash f...

Embodiment 2

[0035] 1) with embodiment 1 step 1);

[0036] 2) with embodiment 1 step 2);

[0037] 3) To Co(SO 4 ) 2 Adding mass concentration to the aqueous solution is 40% hydrofluoric acid to adjust the atomic ratio of F and Co(II) in the solution to be 9:1;

[0038] 4) with embodiment 1 step 4);

[0039] 5) with embodiment 1 step 5);

[0040] 6) Same as step 6) of Example 1.

[0041] From image 3 It can be seen that the obtained Co(OH) 2 The film is composed of flake-like flakes and round particles, the round particles are dispersed among the flake-like particles, and the size is within 0.5 μm. The measured film thickness is about 103 nm. X-ray diffraction proves that the film is β-Co(OH) 2 type.

Embodiment 3

[0043] 1) with embodiment 1 step 1);

[0044] 2) with embodiment 1 step 2);

[0045] 3) To Co(SO 4 ) 2 Adding mass concentration to the aqueous solution is 40% hydrofluoric acid to adjust the atomic ratio of F and Co(II) in the solution to be 6:1;

[0046] 4) with embodiment 1 step 4);

[0047] 5) with embodiment 1 step 5);

[0048] 6) Same as step 6) of Example 1.

[0049] From Figure 4 It can be seen that the obtained Co(OH) 2 The film is composed of flake-like particles, the size of the flake-like particles is relatively large, the connection between the layers is tight, and the surface of the film is dense. From Figure 5 It can be seen that the film thickness measured by the NV50005032 surface roughness measuring instrument is about 673 nm. X-ray diffraction proves that the obtained film is β-Co(OH) 2 type.

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Abstract

The present invention relates to a preparation method for a cobalt hydroxide film with a nano-structure, and belongs to the field of nanomaterials. The preparation method comprises the following steps: adding a coordination agent of hydrofluoric acid to a cobalt salt solution to generate [CoFx]<(x-2)->; then adding ammonia water to provide OH<-1> required by a precipitation hydrolyzing process through cobalt ions; adjusting the pH value of the solution to 8. 5-9.3; inserting a pre-treated substrate to the solution, and heating for 2-4 hours in water bath with the temperature of 50-80 DEG C; removing the film-covered substrate; carrying out treatments of washing and natural drying for the substrate to obtain the Co(OH)2 film with the nano-structure. The preparation method provided by the present invention has characteristics of simple process, high efficiency, fastness and easily-controlled reaction conditions; with adjusting the cobalt salt concentration in the reaction solution, the atom ratio of the F to the Co, the pH value of the system, the heating temperature, the reaction time, and other process parameters, the microstructure of the film can be controlled.

Description

technical field [0001] The invention relates to a nanostructured Co(OH) 2 A thin film and a preparation method thereof belong to the field of nanometer materials. Background technique [0002] Cobalt hydroxide, cobalt oxide, and metal cobalt are one of several key materials for manufacturing MH-Ni, lithium-ion and other rechargeable batteries. In recent years, studies have shown that cobalt oxide and cobalt hydroxide are excellent battery additives. It can significantly improve the performance of the battery: increase the specific capacity and high output power of the battery, improve the charge-discharge cycle life of the battery, improve the ability to withstand overcharge and reduce self-discharge, etc., so that the battery becomes high-energy, small, light, safe, The development of pollution-free and other aspects becomes possible. The cobalt hydroxide membrane electrode has strong stability and reproducibility, and has strong catalytic activity for some organic molec...

Claims

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Application Information

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IPC IPC(8): C03C17/22
Inventor 聂祚仁李群艳解林艳韦奇王志宏
Owner BEIJING UNIV OF TECH
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