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Graphene/Ru nano-composite material for supercapacitor and preparation method thereof

A technology of nanocomposite materials and supercapacitors, applied in the field of nanocomposite materials and their preparation, can solve the problems of reducing electrochemical capacitance value, reducing effective utilization of surface area, etc., and achieves the effects of improving utilization rate, high specific capacitance and high specific surface area

Inactive Publication Date: 2010-05-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, both sides of the graphene nanosheets contribute to the electrochemical capacitance, but a single graphene nanosheet as an electrode material will be re-stacked due to the van der Waals force between the graphene nanosheets, reducing the effective surface area. Utilization, reduces its electrochemical capacitance value

Method used

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  • Graphene/Ru nano-composite material for supercapacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Disperse 310 mg of graphite oxide nanosheets in 400 mL of glycerol by ultrasonic treatment, then add 6 mL of 0.05 M ruthenium chloride solution and 1.0 mL of 1.5 mol / L sodium acetate solution, and stir and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 8 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a graphene / Ru nanocomposite material. The ruthenium nanoparticles in the graphene / Ru nanocomposite material observed by transmission electron microscopy have a uniform particle size, with an average particle size of 2.8 nanometers. EDX analysis shows that the mass fraction of Ru in the composite is 9.8%, which is close to its theoretical value of 10%.

[0016] As a comparison, XC-72 nano-carbon was used as the nano-carbon component of the composite material, and XC-72 / Ru nano-composite material (Ru mass fraction was 10%) was prepared by th...

Embodiment 2

[0019] Disperse 230 mg of graphite oxide nanosheets in 150 mL of ethylene glycol by ultrasonic treatment, then add 10 mL of 0.05 M ruthenium chloride solution and 1.6 mL of 1 mol / L sodium acetate solution, and stir and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 10 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a graphene / Ru nanocomposite material. The ruthenium nanoparticles in the graphene / Ru nanocomposite material observed by transmission electron microscopy have a uniform particle size, with an average particle size of 3.0 nanometers. EDX analysis shows that the mass fraction of Ru in the composite is 19.5%, which is close to its theoretical value of 20%. .

[0020] As a comparison, using carbon nanotubes as the nanocarbon component of the composite material, a carbon nanotube / Ru nanocomposite material (the mass fraction of Ru is 20%)...

Embodiment 3

[0023] Disperse 230 mg of graphite oxide nanosheets in 300 mL of glycerol by ultrasonic treatment, then add 20 mL of 0.05 M ruthenium chloride solution and 2.5 mL of 1 mol / L sodium acetate solution, and stir and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, heated by microwave radiation for 5 minutes, cooled, filtered, fully washed with acetone and deionized water, and dried at 90°C to obtain a graphene / Ru nanocomposite material. The ruthenium nanoparticles in the graphene / Ru nanocomposite material observed by transmission electron microscopy have a uniform particle size, with an average particle size of 3.2 nanometers. EDX analysis shows that the mass fraction of Ru in the composite is 32.1%, which is close to its theoretical value of 33%. .

[0024] The specific capacitance of the composite material was measured by the method of Example 1, and the measured result was: the specific capacitance of the graphene / Ru nanocomposite ...

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Abstract

The invention discloses a graphene / Ru nano-composite material for a supercapacitor. The mass fraction of Ru is between 10 and 50 percent, and the mass fraction of graphene is between 90 and 50 percent. A preparation method comprises the steps of: ultrasonically dispersing oxidized graphite nano-plates into liquid polylol, and then adding solution of ruthenium chloride and solution of sodium acetate into the liquid polylol, wherein in the mixture, the content of the oxidized graphite nano-plates is between 0.5 and 1.5g / L, the concentration of the ruthenium chloride is between 0.0008 and 0.006mol / L, and the concentration of the sodium acetate is between 0.003 and 0.013mol / L; and transferring the mixture into a microwave hydrothermal reaction kettle, performing a microwave heating reaction for 5 to 10 minutes, and then obtaining the graphene / Ru nano-composite material through filtration, washing and drying. The preparation method has the advantages of energy conservation, quickness, simple process and the like; and the graphene / Ru nano-composite material which is taken as an electrode material of an electrochemical supercapacitor has high specific capacitance.

Description

technical field [0001] The invention relates to a nanocomposite material and a preparation method thereof, in particular to a graphene / Ru nanocomposite material for a supercapacitor and a preparation method thereof. Background technique [0002] Electrochemical supercapacitors have high specific power and long cycle life, and are widely used in communication, information storage, electric vehicles and other fields. In particular, it can meet the high power requirements of electric vehicles for starting, accelerating and uphill driving, which is of great significance for optimizing the use of electric vehicle energy and prolonging the cycle life of batteries. According to the different electrode materials, electrochemical capacitors can be divided into electrochemical double-layer capacitors (EDLC) and Faraday quasi-capacitors (FPC). The working principle of EDLC is to charge and discharge through the electric double layer at the interface between the electrode and the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058H01G11/38H01G11/86
CPCY02E60/13
Inventor 陈卫祥赵杰常焜李辉马琳
Owner ZHEJIANG UNIV
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