Preparation method of graphene-loaded nanometre cobalt hydroxide (Co(OH)2) composite material

A technology of composite materials and graphene, which is applied in the direction of conductive materials, conductive materials, cable/conductor manufacturing, etc., can solve problems such as easy agglomeration and affecting the excellent performance of nano-effects, and achieve convenient post-processing, excellent electrochemical performance, and solution The effect of the reunion problem

Active Publication Date: 2011-08-03
TECH TRANSFER CENT CO LTD NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the Co(OH) prepared by the prior art 2 Nanomaterials are prone to agglomeration during the application process and may form a passive film, which causes a large capacity loss in the first charge / discharge cycle, which seriously affects the excellent performance due to the nano effect

Method used

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  • Preparation method of graphene-loaded nanometre cobalt hydroxide (Co(OH)2) composite material
  • Preparation method of graphene-loaded nanometre cobalt hydroxide (Co(OH)2) composite material
  • Preparation method of graphene-loaded nanometre cobalt hydroxide (Co(OH)2) composite material

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preparation example Construction

[0016] combine figure 1 , graphene-loaded nanometer Co(OH) of the present invention preparation method, comprises the following steps:

[0017] Step 1: Mix CoCl2·6H2O, graphite oxide and isopropanol to make a solution, and disperse evenly by ultrasonic;

[0018] Step 2: heat up the solution prepared in step 1 under stirring;

[0019] Step 3: Na2S and water are added to the mixed solution of step 2 to react, and the reaction equation is:

[0020]

[0021] CoCl2+2NaOH→Co(OH)2+2NaCl;

[0022] Step 4: Centrifuge, wash, dry, and grind the black precipitate obtained from the reaction in Step 3 to obtain a graphene-supported nano-Co(OH)2 composite material.

[0023] The concentration of graphite oxide in isopropanol is 0.0001-0.001g / mL. The concentration of CoCl2·6H2O in isopropanol is 0.01272~0.1272g / mL. In step 2, the temperature is raised to 60° C. to 83° C. The reaction time in step 3 is 10 min to 10 h. The mass ratio of CoCl2.4H2O to Na2S is 1:0.1-1. The concentration...

Embodiment 1

[0026] Step 1: Mix 1.908g CoCl2·6H2O, 0.025g graphite oxide and 50mL isopropanol to form a solution, and disperse evenly by ultrasonic;

[0027] Step 2: Heat up the solution prepared in Step 1 to 60°C under stirring;

[0028] Step 3: Dissolve 0.34g Na2S in 10mL of water and add it to the mixture in step 2, react for 10min, the reaction equation is:

[0029]

[0030] CoCl2+2NaOH→Co(OH)2+2NaCl;

[0031] Step 4: Centrifuge, wash, dry, and grind the black precipitate obtained in Step 3 to obtain a graphene-supported nano-Co(OH)2 composite material, and the feed ratio is Co(OH)2 / GO=30 / 1. The transmission electron microscope test results are as follows: figure 2 c, d shown. The results of cyclic voltammetry were as image 3 shown.

[0032] according to image 3 Calculated, the capacitance of the composite material is 1020.1F / g. The capacitance of Co(OH)2 alone is 789.4F / g, and that of GO alone is 198.9F / g. It can be seen that when the two are combined, the capacitance of...

Embodiment 2

[0034] Step 1: Mix 0.636g CoCl2·6H2O, 0.025g graphite oxide and 50mL isopropanol to form a solution, and disperse evenly by ultrasonic;

[0035] Step 2: Heat up the solution prepared in Step 1 to 60°C under stirring;

[0036] Step 3: Dissolve 0.34g Na2S in 10mL of water and add it to the mixture in step 2, react for 10min, the reaction equation is:

[0037]

[0038] CoCl2+2NaOH→Co(OH)2+2NaCl;

[0039] Step 4: Centrifuge, wash, dry, and grind the black precipitate obtained in Step 3 to obtain a graphene-supported nano-Co(OH)2 composite material, and the feed ratio is Co(OH)2 / GO=10 / 1. The transmission electron microscope test results are as follows: figure 2 a, b shown. The results of cyclic voltammetry were as image 3 shown. It was determined that the specific capacitance of the obtained composite material was 427.8 F / g.

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Abstract

The invention relates to a preparation method of a nanometre composite material, in particular to the preparation method of a graphene-loaded nanometre cobalt hydroxide (Co(OH)2) composite material. The preparation method of the graphene-loaded nanometre Co(OH)2 composite material comprises the following steps of: 1, mixing a cobalt dichloride 6 hydrogen oxide (CoCl2.6H2O), a graphite oxide and isopropanol to prepare a solution, and carrying out ultrasonic homodisperse on the solution; 2, raising the temperature of the solution under stirring; 3, adding a sodium sulphide (Na2S) and water into the mixed solution in the step 2 for reaction; and 4, centrifuging a black precipitate obtained by the reaction in the step 3, washing, drying and grinding to obtain the graphene-loaded nanometre Co(OH)2 composite material. The preparation method of the graphene-loaded nanometre Co(OH)2 composite material is a soft chemical method which is simple in operation and prepares the graphene-loaded nanometre Co(OH)2 composite material with excellent electrochemical performance in a mild condition.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite material, in particular to a graphene-supported nano Co(OH) 2 method of preparation. Background technique [0002] Supercapacitor is a new type of energy storage device whose performance is between that of battery and traditional capacitor. High, no pollution to the environment, long cycle life, wide operating temperature range, high safety and so on. In recent years, it has been widely used in the fields of mobile communication, information technology, aerospace and national defense technology, showing unprecedented application prospects. Especially in electric vehicles, supercapacitors and batteries jointly provide high power and high energy, which not only reduces the size of the power supply but also prolongs the battery life. [0003] Electrode materials are the most critical part of supercapacitors and the main factor determining their performance. Therefore, the development of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/00H01B13/00C01G51/04H01G9/042
Inventor 朱俊武汪信陈胜刘孝恒韩巧凤杨绪杰陆路德
Owner TECH TRANSFER CENT CO LTD NANJING UNIV OF SCI & TECH
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