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A kind of method for preparing graphene electrode material by electrophoresis

A graphene electrode and graphene hydrogel technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem of preparing graphene electrode materials that have not yet been seen, the process technology is complex, and large-scale production cannot be achieved and other problems, to achieve the effect of excellent electrical properties, high conductivity, and low requirements for production equipment

Inactive Publication Date: 2018-05-15
DONGHUA UNIV
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Problems solved by technology

Although the graphene obtained by the latter two methods has excellent properties, due to the complicated process technology, it cannot be directly mass-produced in industry.
[0004] Therefore, finding a way to prepare high conductivity, high specific surface area, high stability, and low-cost graphene-based electrode materials is the research focus of improving the capacitance of supercapacitors. At present, it has not been seen that graphite is prepared on silver wire by electrophoresis. A report on the method of ene electrode materials

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  • A kind of method for preparing graphene electrode material by electrophoresis
  • A kind of method for preparing graphene electrode material by electrophoresis
  • A kind of method for preparing graphene electrode material by electrophoresis

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Embodiment 1

[0026] Weigh 0.20 g of graphite oxide at room temperature, add 100 mL of deionized water to obtain a 2 mg / mL solution, and sonicate for 2 h to form a uniformly dispersed solution. Select a silver wire with a diameter of 0.5 mm and a length of 5 cm, and use a three-electrode method on an electrochemical workstation CHI760 (such as figure 1 ), add a constant voltage of 8V, and the electrophoretic deposition time is 2min to obtain graphene oxide hydrogel. The obtained graphene oxide hydrogel is taken out and immersed in 1mol / L sodium sulfate solution 1h, taken out and placed under a xenon lamp for photoreduction 6h, to obtain a graphene electrode material (such as figure 2 ). image 3 For the scanning electron microscope picture of the graphene electrode material prepared in this embodiment, it can be seen that the overall morphology of graphene is in a wrinkled state, and the surface is smooth and flat without falling off, indicating that the mechanical strength is good, and ...

Embodiment 2

[0028] Weigh 0.20 g of graphite oxide at room temperature, add 100 mL of deionized water to obtain a 2 mg / mL solution, and sonicate for 2 h to form a uniformly dispersed solution. Select a silver wire with a diameter of 0.5 mm and a length of 5 cm, and use a three-electrode method on an electrochemical workstation CHI760 (such as figure 1 ), add a constant voltage of 4V, and the electrophoretic deposition time is 2min to obtain graphene oxide hydrogel. The obtained graphene oxide hydrogel was taken out and soaked in a 1 mol / L sodium sulfate solution for 1 hour, and placed under a xenon lamp for photoreduction for 6 hours to obtain a graphene electrode material. Figure 5 For the scanning electron microscope picture of the graphene electrode material prepared by the present embodiment, it can be seen that: the overall appearance of graphene presents a wrinkled state, relative example 1 ( image 3 ), the stacking of graphene sheet structure is loose and easy to fall off. It ca...

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Abstract

The present invention relates to a method of preparing a graphite electrode material by an electrophoresis method. The method comprises the steps of dispersing the graphite oxide in the water, carrying out an ultrasonic operation to obtain a graphite oxide solution; connecting a silver wire with a working electrode and then placing in the graphite oxide solution, by taking a platinum electrode as a counter electrode and the Ag / AgCl as a reference electrode, carrying out the constant voltage electrophoretic deposition to obtain a graphene oxide hydrogel; dipping the graphene oxide hydrogel in the sodium sulfate, taking out and carrying out the photo-reduction to obtain the graphite electrode material. The preparation method of the present invention is simple, has low requirements for production equipment, and is easy for the industrial production. The prepared graphite electrode material is high in conductivity, large in specific capacitance and stable in chemical property.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials, in particular to a method for preparing graphene electrode materials by electrophoresis. Background technique [0002] Graphene is currently known as the thinnest and hardest two-dimensional nanomaterial. Since the advent of graphene, it has attracted the attention of many scholars with its excellent mechanical and electrical properties. Studies have shown that graphene has a charge mobility greater than 1500 cm at room temperature 2 / V·s, the resistivity is only about 1Ω·m. Therefore, graphene is an ideal material for preparing graphene-based supercapacitor electrode materials. [0003] At present, the preparation methods of graphene mainly include chemical reduction graphite oxide method, thermal reduction graphene oxide method, graphene hydrogel method and activated graphene method. The chemical reduction of graphite oxide is currently the mainstream production method. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/36H01G11/86
Inventor 李耀刚时秋伟劳春健王宏志张青红
Owner DONGHUA UNIV
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