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Preparation method for composite electrode material composed of graphite and manganese dioxide

A technology of manganese dioxide and composite materials, which is applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of reduced capacitance performance, loss of specific surface area, and agglomeration of graphene materials, and achieves reduced agglomeration, excellent capacitance performance, and a simple method Effect

Active Publication Date: 2012-05-23
YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the literature has reported the performance of graphene-based supercapacitors (Nano Lett. , eventually leading to a reduction in its capacitive performance

Method used

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  • Preparation method for composite electrode material composed of graphite and manganese dioxide
  • Preparation method for composite electrode material composed of graphite and manganese dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of graphene oxide-manganese dioxide composite material:

[0027] 10mL 4mg·mL -1 Graphene oxide and 2mL at a concentration of 0.05mol mL -1 KMnO 4 The solution was mixed and sonicated for 30 minutes. Transfer the above mixture to a round bottom flask, add 2mL of 0.05mol·mL -1 The citric acid solution was stirred at room temperature for 15 minutes, and finally the resulting mixed solution was heated to reflux at 80° C. for 7 hours to obtain a black graphene oxide-manganese dioxide composite colloidal solution.

[0028] (2) In situ reduction of graphene oxide-manganese dioxide composites:

[0029] Add 80mL of deionized water to the obtained graphene oxide-manganese dioxide composite colloidal solution, ultrasonic treatment for 30 minutes, then add 2mL of hydrazine hydrate (80wt.%), and heat to reflux at 100°C for 24 hours, use a large amount of ethanol and Washing with deionized water and suction filtration, drying at 60°C in a vacuum oven to obtain a ...

Embodiment 2

[0036] (1) Preparation of graphene oxide-manganese dioxide composite material:

[0037] 10mL 4mg·mL -1 Graphene oxide and 2mL at a concentration of 0.1mol mL -1 KMnO 4 The solution was mixed and sonicated for 30 minutes. Transfer the above mixed solution to a round bottom flask, add 2mL concentration of 0.1mol mL -1 The citric acid solution was stirred at room temperature for 15 minutes, and finally the resulting mixed solution was heated to reflux at 80° C. for 7 hours to obtain a black graphene oxide-manganese dioxide composite colloidal solution.

[0038] (2) In situ reduction of graphene oxide-manganese dioxide composites:

[0039] Add 80mL of deionized water to the obtained graphene oxide-manganese dioxide composite colloidal solution, ultrasonic treatment for 30 minutes, then add 2mL of hydrazine hydrate (80wt.%), and heat to reflux at 100°C for 24 hours, use a large amount of ethanol and Wash with deionized water, filter with suction, and dry in a vacuum oven at 60...

Embodiment 3

[0042] (1) Preparation of graphene oxide-manganese dioxide composite material:

[0043] 10mL 4mg·mL -1 Graphene oxide and 2mL at a concentration of 0.05mol mL -1 KMnO 4 The solution was mixed and sonicated for 30 minutes. Transfer the above mixture to a round bottom flask, add 2mL of 0.05mol·mL -1 The citric acid solution was stirred at room temperature for 15 minutes, and finally the resulting mixed solution was heated and refluxed at 80°C for 7 hours to obtain a black graphene oxide-manganese dioxide composite colloidal solution, which was filtered and washed with a large amount of ethanol and deionized Wash with water, filter with suction, and dry in a vacuum oven at 60°C to obtain graphene oxide-manganese dioxide composite material powder.

[0044] (2) The obtained graphene oxide-manganese dioxide composite material powder is electrochemically tested, and the steps are the same as in Example 1. The results showed that at 0.5A·g -1 The specific capacitance of the grap...

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Abstract

The invention discloses a preparation method for a composite electrode material composed of graphite and manganese dioxide. The preparation method comprises the following steps of: firstly, preparing a colloidal solution of a graphite oxide-manganese dioxide composite material by taking the graphite as a carrier, potassium permanganate as a manganese source and citric acid as a reducing agent; secondly, reducing the prepared graphite oxide-manganese dioxide composite material by taking hydrazine hydrate as the reducing agent; and thus obtaining a graphite-manganese dioxide composite material. The material has good performance of a super capacitor, and can be used as the electrode material of the super capacitor.

Description

technical field [0001] The invention relates to a preparation method of a composite electrode material composed of graphene and manganese dioxide. Background technique [0002] Energy and environmental issues are two major problems that human beings need to solve urgently. Today, with the depletion of fossil energy and increasingly serious environmental pollution, it is particularly urgent to seek renewable green energy to replace traditional fossil energy and to seek a harmonious coexistence between man and the environment. As an emerging energy storage device, supercapacitors have attracted the attention of scientists from all over the world since their appearance. It is an excellent energy device between traditional physical capacitors and batteries. It has the advantages of short charging time, long service life, and wide operating temperature range. The most important thing is that it is a green energy source. The core component is the electrode material with excellen...

Claims

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Application Information

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IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 王金清李章朋杨生荣刘胜
Owner YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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