Preparation method of Co3O4/graphene nanocomposite material

A nano-composite material and graphene technology, which is applied in the field of preparation of Co3O4/graphene composite materials, can solve problems that have not been reported before, and achieve the effect of small particle size, novel material and uniform compounding

Inactive Publication Date: 2012-12-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the deepening of research, people have prepared Co by various physical and chemical methods. 3 o 4 and graphene composites, but for the

Method used

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  • Preparation method of Co3O4/graphene nanocomposite material
  • Preparation method of Co3O4/graphene nanocomposite material
  • Preparation method of Co3O4/graphene nanocomposite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of Co from Cobalt Chloride 3 o 4 / graphene nanocomposite material, its process and steps are as follows:

[0026] (1) Preparation of graphene oxide solution: the traditionally known Hummers chemical graphite oxide method is adopted. The specific process is as follows: 100mL of 98% H 2 SO 4 Add to 2.0g KNO 3 and 4.0g graphite, after mixing and stirring for 30min, slowly add 15g KMnO 4 . Afterwards, the temperature of the system was raised to 35±3°C, and the reaction was carried out at this temperature for 2 hours. Then dropwise add 180mLH 2 O, after adding H dropwise 2 The process of O will increase the temperature to close to 100°C, after stirring at this temperature for 30min, add 14mL 30% H 2 o 2 to remove excess KMnO 4 , and finally with 500mL 3% HCl and a large amount of H 2 O was washed, centrifuged, and vacuum-dried to obtain graphite oxide. Graphite oxide was ultrasonically dispersed in deionized water to prepare a 1 mg / mL graphene oxid...

Embodiment 2

[0031] Preparation of Co from cobalt nitrate 3 o 4 / graphene nanocomposite material, its process and steps are as follows:

[0032] (1) Preparation of graphene oxide solution: the traditionally known Hummers chemical graphite oxide method is adopted. The specific process is as follows: 100mL of 98% H 2 SO 4 Add to 2.0g KNO 3 and 4.0g graphite, after mixing and stirring for 30min, slowly add 15g KMnO 4 . Afterwards, the temperature of the system was raised to 35±3°C, and the reaction was carried out at this temperature for 2 hours. Then dropwise add 180mLH 2 O, after adding H dropwise 2 The process of O will increase the temperature to close to 100°C, after stirring at this temperature for 30min, add 14mL 30% H 2 o 2 to remove excess KMnO 4 , and finally with 500mL 3% HCl and a large amount of H 2 O was washed, centrifuged, and vacuum-dried to obtain graphite oxide. Graphite oxide was ultrasonically dispersed in deionized water to prepare a 1 mg / mL graphene oxide...

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Abstract

Belonging to the technical field of chemical material preparation, the invention relates to a preparation method of a Co3O4/graphene nanocomposite material. The method provided in the invention is characterized by: first employing a simple chemical method to synthesize Co3O4 nanoparticles under the protection of a surfactant, then adsorbing oxidized graphene on surfaces of the Co3O4 nanoparticles uniformly by means of the interaction between the surfactant and the oxidized graphene, and reducing the oxidized graphene, thus forming the uniform Co3O4/graphene nanocomposite material. Good electrical conductivity is achieved among Co3O4 nanoparticles through graphene, so that the electroconductibility of the composite material can be improved. The Co3O4 nanoparticles in the composite material have a size of 50-100 nanometers, and account for 60%-95% by weight. The method provided in the invention does not involve environmentally harmful materials, and the process is simple, practicable and easy to operate. The prepared Co3O4/graphene nanocomposite material has high specific capacity and capacitance, as well as good cycle performance, thus having good application prospects in the fields of lithium ion batteries and supercapacitors.

Description

technical field [0001] The present invention relates to a Co 3 o 4 The invention relates to a preparation method of a graphene composite material, which belongs to the technical field of chemical and chemical material preparation technology. Background technique [0002] With the rapid development of mobile communications and portable electronic devices, the performance requirements for electrode materials are getting higher and higher. New battery materials with high energy density, high power density, low cost, and environmental friendliness are the focus of current and future research. At present, the focus of research on battery materials is mostly on new secondary battery materials and fuel cell materials. Lithium-ion batteries are a new generation of secondary batteries developed on the basis of metal lithium secondary batteries. They have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and low sel...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/587B82Y30/00
CPCY02E60/12Y02E60/10
Inventor 潘兰英董晓雯赵宏滨徐甲强
Owner SHANGHAI UNIV
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