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Method for preparing composite of grapheme with different oxidation degrees and manganese dioxide

A technology of manganese dioxide and oxidation degree, which is applied in capacitors, circuits, electrolytic capacitors, etc., can solve the problems that the application of graphene and nano-manganese dioxide composite electrodes has not been found, and achieve obvious supercapacitive performance, low energy consumption, and simple operation Effect

Inactive Publication Date: 2012-10-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no research has been found on the preparation of composite electrodes of graphene and nano-manganese dioxide with different oxidation degrees and its application in supercapacitors.

Method used

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  • Method for preparing composite of grapheme with different oxidation degrees and manganese dioxide
  • Method for preparing composite of grapheme with different oxidation degrees and manganese dioxide
  • Method for preparing composite of grapheme with different oxidation degrees and manganese dioxide

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Effect test

Embodiment 1

[0023] Step 1: Pour 120mL of concentrated sulfuric acid with a mass fraction of 98% into a beaker containing 3g of raw graphite, and stir for 15min under ice bath conditions; slowly add 15gKMnO to the mixture 4 And keep the temperature not higher than 4°C. After the addition, stir in an ice bath for 2 hours; move the mixture to a 35°C water bath and continue stirring for 1 hour, then raise the temperature to 60°C and keep it for 30 minutes. Slowly add 250mL of deionized water to the mixture to control The dropping speed keeps the temperature of the system at 60±3°C; take it out after stirring for 15 minutes after adding, stir at room temperature and quickly add 500mL deionized water and 30mLH 2 o 2 , the reaction was terminated after stirring for 15 min, and a golden yellow suspension was obtained. The sulfate ions were removed by centrifugal washing with 10% dilute hydrochloric acid, dried at 60 °C for 24 h, and ground to obtain GO powder.

[0024] Step 2: Take 0.1 g of GO ...

Embodiment 2

[0027] Step 1: Prepare graphite oxide as in Step 1 in Example 1.

[0028] Step 2: Take 0.1 g of GO powder prepared in Step 1 and add it to 100 mL of deionized water, sonicate for 2 hours to obtain a uniformly dispersed 1 mg / mL graphite oxide solution, transfer the solution to a round bottom flask, add 100 μL of hydrazine hydrate, shake well, and put Reflux in a water bath furnace at 80°C, control the reduction time for 30 minutes, take it out, filter it with suction, wash it, and then ultrasonically disperse it in deionized water to obtain a uniform suspension, and obtain graphene oxide with a large specific surface area by freeze-drying.

[0029] Step 3: weigh the prepared graphene oxide powder 0.066g and MnCl 2 4H 2 O (0.27g) was mixed in 50mL isopropanol and sonicated for 2h, the dispersed mixed solution was placed in a water bath at 80°C and stirred, and 5mL dissolved in 0.15g KMnO was quickly poured into it. 4 deionized water, reflux for 30min, take out suction filtrati...

Embodiment 3

[0031] Step 1: Prepare graphite oxide as in Example 1.

[0032] Step 2: Take 0.1 g of GO powder prepared in Step 1 and add it to 100 mL of deionized water, sonicate for 2 hours to obtain a uniformly dispersed 1 mg / mL graphite oxide solution, transfer the solution to a round bottom flask, add 100 μL of hydrazine hydrate, shake well, and put Reflux in a water-bath furnace at 80°C, control the reduction time for 1 hour, take it out, filter it with suction, wash it, and then ultrasonically disperse it in deionized water to obtain a uniform suspension, and obtain graphene oxide with a large specific surface area by freeze-drying.

[0033] Step 3: weigh 0.066g of graphene oxide powder prepared in step 2 and MnCl 2 4H 2 O (0.27g) was mixed in 50mL isopropanol and sonicated for 2h, the dispersed mixed solution was placed in a water bath at 80°C and stirred, and 5mL dissolved in 0.15g KMnO was quickly poured into it. 4 deionized water, reflux for 30min, take out suction filtration, w...

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Abstract

The invention discloses a method for preparing composite of grapheme with different oxidation degrees and manganese dioxide. The method comprises the processes of: respectively carrying out low-temperature, intermediate-temperature and high-temperature subsection reactions on original graphite, and concentrated sulfuric acid with a mass concentration of 98% and potassium permanganate so as to obtain graphite oxide; dispersing the graphite oxide in de-ionized water, and reducing the prepared graphite oxide with hydrazine hydrate so as to obtain the grapheme oxide with different oxidation degrees by controlling reduction time; and mixing the grapheme oxide with MnCl2*4H2O in an isopropyl alcohol solution, and adding a water solution of the potassium permanganate to prepare the composite of the grapheme with the different oxidation degrees and the manganese dioxide through oxidation reduction. The method provided by the invention has the advantages as follows: materials used in the method are rich in storage amount and low in cost, so that the method is good in commercialization; an dispersing agent, a stabilizer and the like do not need to be added, and a pure chemical technology is used, so that simple operation, no pollution and low energy consumption can be realized; and the prepared composite material of the grapheme and the manganese dioxide has high purity and good stability.

Description

technical field [0001] The invention relates to a preparation method of graphene and manganese dioxide composites with different oxidation degrees, which belongs to the composite technology of carbon materials and metal oxides. Background technique [0002] Graphene is a single-layer or multi-layer extremely thin graphite material discovered in recent years. It has been prepared by mechanical exfoliation since 2004 by Andre K. Heim and Konstantin Novoselov of the University of Manchester, UK. After producing a single-layer graphite sheet with a thickness of about 1nm and winning the Nobel Prize in Physics in 2010, it caused a research boom all over the world. Graphene is the construction of zero-dimensional fullerene, one-dimensional carbon nanotubes, three-dimensional bulk graphite and other sp 2 The basic structural unit of hybrid carbon. Graphene has many unique properties, such as excellent electrical properties, mechanical properties and thermal properties, and its sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
Inventor 师春生李英赵乃勤刘恩佐何春年
Owner TIANJIN UNIV
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