Method for preparing NiCo2O4/graphene supercapacitor material with microwave method

A supercapacitor and graphene technology, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of unfavorable practical large-scale application, long reaction time, high production cost, etc., and achieve easy industrial implementation, excellent electrochemical performance, and feasibility sex high effect

Inactive Publication Date: 2015-09-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have complicated preparation process, long reaction time, high temperature, high energy consumption and high production cost, which are not conducive to practical large-scale application.

Method used

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  • Method for preparing NiCo2O4/graphene supercapacitor material with microwave method
  • Method for preparing NiCo2O4/graphene supercapacitor material with microwave method
  • Method for preparing NiCo2O4/graphene supercapacitor material with microwave method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse 20 mg of graphite oxide in 40 mL of deionized water and ultrasonically form a uniform dispersion. Then add 1.00 mmol NiCl 2 . 6H 2 O and 2.00 mmol CoCl 2 . 6H 2 O, fully stirred for 1 h, then added 30 mmol of urea, and stirred for another 1 h. The mixture was transferred to a microwave reactor and heated to 100 °C under reflux for 15 min. The obtained product was separated by centrifugation, washed three times with deionized water and absolute ethanol, and finally vacuum-dried at 45 °C for 24 h. The dried material is used as a precursor and calcined at 300 °C for 2 h in the air atmosphere to obtain porous sheet-like NiCo 2 o 4 / Graphene supercapacitor material.

[0026] figure 1 It is the XRD pattern of the product, except that NiCo is observed in the figure 2 o 4 Except for the diffraction peak of , there are no other diffraction peaks, indicating that the target product has been synthesized and no by-products are produced.

[0027] figure...

Embodiment 2

[0031] Disperse 20 mg of graphite oxide in 40 mL of deionized water and ultrasonically form a uniform dispersion. Then add 0.50 mmol NiCl 2 . 6H 2 O and 1.00 mmol CoCl 2 . 6H 2 O, fully stirred for 1 h, then added 30 mmol of urea, and stirred for another 1 h. The mixture was transferred to a microwave reactor and heated to 100 °C under reflux for 15 min. The obtained product was separated by centrifugation, washed three times with deionized water and absolute ethanol, and finally dried under vacuum at 45 °C for 24 h. The dried material is used as a precursor and calcined at 300 °C for 2 h in the air atmosphere to obtain porous sheet-like NiCo 2 o 4 / Graphene supercapacitor material.

Embodiment 3

[0033] Disperse 20 mg of graphite oxide in 40 mL of deionized water and ultrasonically form a uniform dispersion. Then add 0.75 mmol NiCl 2 . 6H 2 O and 1.50 mmol CoCl 2 . 6H 2O, fully stirred for 1 h, then added 30 mmol of urea, and stirred for another 1 h. The mixture was transferred to a microwave reactor and heated to 100 °C under reflux for 15 min. The obtained product was separated by centrifugation, washed three times with deionized water and absolute ethanol, and finally vacuum-dried at 45 °C for 24 h. The dried material is used as a precursor and calcined at 300 °C for 2 h in the air atmosphere to obtain porous sheet-like NiCo 2 o 4 / Graphene supercapacitor material.

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Abstract

The invention belongs to the field of preparation of nano composite materials, and relates to a method for preparing a NiCo2O4/graphene supercapacitor material with a microwave method. The main steps includes: using natural graphite as a raw material, oxidizing with a Hummers method to obtain graphite oxide, ultrasonically dispersing the graphite oxide in water, then adding cobalt chloride and nickel chloride, stirring and then adding urea, continuing to stir, then heating the mixed solution in a microwave reactor to 100 DEG C and carrying out a reflux reaction for 5 to 25 min, thereby obtaining a precursor, and calcining the precursor in an air atmosphere at 300 DEG C for 2h, thereby obtaining a porous flaky NiCo2O4/graphene supercapacitor material. The prepared composite supercapacitor material is synthesized through the microwave method, the preparation method is simple in technology, convenient to operate, high in feasibility, and rapid and efficient, and is easy to realize industrial implementation. The synthesized NiCo2O4 is tightly attached to the graphene, and excellent electrochemical performance is represented.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials, in particular to a microwave method for preparing NiCo 2 o 4 / method of graphene supercapacitor material. Background technique [0002] Due to the energy crisis and the deteriorating ecological environment, people's demand for new clean and renewable energy is increasing. However, these energy sources are often fluctuating and intermittent. To ensure the stable and efficient use of these energy sources, it is necessary to develop and design high-performance energy storage devices. Supercapacitors have the characteristics of high power density, fast charge and discharge performance, long cycle life, wide operating temperature range and environmental protection, and have become one of the hot spots in the research of energy storage devices. Supercapacitors can be divided into two categories according to the energy storage mechanism. One is an electric double layer capacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
CPCY02E60/13H01G11/86
Inventor 蔡晓庆沈小平马连波季振源
Owner JIANGSU UNIV
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