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Method for preparing graphene oxide-loaded nano manganese dioxide

A graphene and nanotechnology, which is applied in the field of preparation of nanocomposite materials, can solve problems such as no discovery, and achieve the effects of convenient equipment, broad application prospects and simple operation.

Active Publication Date: 2010-11-17
SHANDONG HANFANG BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no discovery about the use of graphene oxide to support nano-MnO 2 Research

Method used

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  • Method for preparing graphene oxide-loaded nano manganese dioxide
  • Method for preparing graphene oxide-loaded nano manganese dioxide
  • Method for preparing graphene oxide-loaded nano manganese dioxide

Examples

Experimental program
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preparation example Construction

[0016] combine figure 1 , the present invention supports graphene oxide nanometer MnO 2 The preparation method comprises the following steps:

[0017] Step 1: high-speed centrifugation to dehydrate graphite oxide;

[0018] Step 2: MnCl 2 4H 2 O, dehydrated graphite oxide and isopropanol in step one are mixed to form a mixed solution, and ultrasonic is carried out so that graphite oxide is peeled off to a certain extent, MMn 2+ Intercalation into the graphite oxide layer, interacting with the polar groups of graphite oxide, as the active point of the reaction, so that MnO 2 Nanocrystals are grown in situ on graphene oxide sheets. Ultrasonic time is 10min~2h; graphite oxide and MnCl 2 4H 2 The ratio of O is 1:0.009~0.27, in which MnCl 2 4H 2 The unit of O is g, the unit of graphite oxide is mL, and the concentration of graphite oxide is 6.65mg / mL; MnCl 2 4H 2 The ratio of O to isopropanol is 0.0018~0.054:1, where the unit of isopropanol is g, MnCl 2 4H 2 The unit of...

Embodiment 1

[0022] Example 1: Graphene oxide-supported nano-MnO of the present invention 2 The preparation method comprises the following steps:

[0023] Step 1: dehydrate 10 mL of graphite oxide by high-speed centrifugation;

[0024] Step 2: 0.09g MnCl 2 4H 2 O, dehydrated graphite oxide in step 1 is mixed with 50mL isopropanol to form a mixed solution, and ultrasonic 10min;

[0025] Step 3: Heat up the mixed solution prepared in Step 2 to 83°C under stirring;

[0026] Step 4: Add 0.063gKMnO 4 Dissolve in 5mL of water and add to the mixed solution prepared in step 3 at one time, and react for 30min;

[0027] Step 5: centrifuge, wash, dry, and grind the black precipitate obtained from the reaction in step 4 to obtain graphene oxide-loaded nano-MnO 2 Composite material; loading mass ratio is MnO 2 / GO=0.5 / 1, the cyclic voltammetry curve is as follows image 3 The first curve (I) in (b), the capacitance value calculated according to the curve is 60.3F·g -1 .

Embodiment 2

[0028] Example 2: Graphene oxide-supported nano-MnO of the present invention 2 The preparation method comprises the following steps:

[0029] Step 1: dehydrate 10 mL of graphite oxide by high-speed centrifugation;

[0030] Step 2: 0.36g MnCl 2 4H 2 O, dehydrated graphite oxide in step 1 is mixed with 50mL isopropanol to form a mixed solution, and ultrasonic 2h;

[0031] Step 3: Heat up the mixed solution prepared in Step 2 to 70°C under stirring;

[0032] Step 4: Add 0.20g KMnO 4 Dissolve in 10 mL of water and add to the mixed solution prepared in step 3 at one time, and react for 2 hours;

[0033] Step 5: centrifuge, wash, dry, and grind the black precipitate obtained from the reaction in step 4 to obtain graphene oxide-loaded nano-MnO 2 composite materials such as figure 2 (c); The load mass ratio is MnO 2 / GO=2 / 1, its cyclic voltammetry curve is as follows image 3 The second curve (II) in (b), according to the curve, the calculated capacitance value is 111.9F·g ...

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Abstract

The invention relates to a method for preparing a nano composite material, in particular to a method for preparing a graphene oxide-loaded nano manganese dioxide composite material. The method comprises the following steps: step one, centrifuging at a high speed to dewater graphite oxide; step two, mixing MnCl2.4H2O, dewatered graphite oxide in step one and isopropanol to prepare into a mixed solution, and performing ultrasound; step three, heating the well-prepared mixed solution in step two while stirring; step four, adding KMnO4 and water in the well-prepared mixed solution in step three for reacting; and step five, centrifuging, washing, drying and grinding black precipitation obtained in the reaction in step four to obtain the graphene oxide-loaded nano manganese dioxide composite material. The method in the invention is low-temperature, rapid and simply-operated soft chemical method, and can prepare the graphene oxide-loaded nano manganese dioxide compounds with good electrochemical properties under a mild condition.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite material, in particular to a preparation method of graphene oxide-loaded nano manganese dioxide. Background technique [0002] MnO 2 It is a multifunctional transition metal oxide that has been widely studied. It has the advantages of environmental friendliness, low price, abundant resources, etc., and has excellent electrochemical performance. It has achieved great success in the commercialization process as a battery electrode material. In recent years, due to the novel effects brought about by nanomaterials, people have been interested in nano-MnO 2 There is growing interest in research on nano-MnO 2 Reports as electrode materials for supercapacitors are also common. But nano MnO 2 Agglomeration is easy to occur in the process of being used as an electrode material for a supercapacitor, which makes its cycle performance worse, and may even lose the excellent performance brought by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058C01G45/02H01G11/86
Inventor 汪信朱俊武陈胜刘孝恒杨绪杰韩巧凤陆路德
Owner SHANDONG HANFANG BIOTECH CO LTD
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