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Graphene electrode and its preparation method and application

A graphene electrode and reaction technology, applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of poor frequency response, large internal resistance, and limit the practical application of AC line filters, etc., to reduce internal resistance , High specific capacitance, the effect of improving the fast charge and discharge speed

Active Publication Date: 2015-09-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these excellent properties make supercapacitors have the potential advantages of replacing aluminum electrolytic capacitors, their practical application in AC line filters is limited due to their large internal resistance and poor frequency response.

Method used

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  • Graphene electrode and its preparation method and application
  • Graphene electrode and its preparation method and application
  • Graphene electrode and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The graphene oxide aqueous solution is ultrasonically dispersed in the lithium perchlorate aqueous solution as the electrolyte, so that the concentration of graphene oxide is 3 mg / mL, and the concentration of lithium perchlorate is 0.1 mol / L. Electrode method (using a polished gold substrate with a thickness of 200 microns as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum sheet as the counter electrode) for electrochemical reduction reaction for 10 seconds, the test electrode area is 1.4cm 2 After the reaction is completed, the product is reduced in a lithium perchlorate aqueous solution with a concentration of 1 mol / L for 30 seconds, and rinsed with deionized water to obtain a graphene electrode with a three-dimensional porous network structure provided by the present invention.

[0032]The graphene electrode of the obtained three-dimensional porous network structure prepared by this embodiment is assembled into a superca...

Embodiment 2

[0040] The graphene oxide aqueous solution is ultrasonically dispersed in the lithium perchlorate aqueous solution as the electrolyte, so that the concentration of graphene oxide is 2.5mg / mL, the concentration of lithium perchlorate is 0.1mol / L, and the polished nickel substrate is used as the working electrode , the saturated calomel electrode is the reference electrode, and the platinum sheet is the counter electrode. Under the potential of -1.2V, the electrochemical reduction reaction is carried out by the three-electrode method for 10 seconds, and the test electrode area is 1.4cm 2 After the reaction is completed, the product is reduced in 1mol / L lithium perchlorate aqueous solution for 30 seconds, and then rinsed with deionized water to obtain a graphene electrode with a three-dimensional porous network structure.

[0041] The graphene electrode of the obtained three-dimensional porous network structure prepared by this embodiment is assembled into a supercapacitor of symm...

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Abstract

The invention discloses a grapheme electrode and a preparation method and application thereof. A substrate of the grapheme electrode is a polished metal substrate, the aperture is 5-20 micrometers, and the thickness is 10-60 micrometers. The preparation method of the grapheme electrode includes that an electrolytic water solution of oxidized grapheme is electrolyzed through constant potentials in a three electrode method, electrochemical reduction grapheme is deposited on the metal substrate, reduction is further performed in a lithium perchlorate electrolyte solution, and the three-dimensional porous meshed electrode is obtained after deionized water washing. The preparation method of the grapheme electrode is environment-friendly, simple, convenient and easy to do, and can be used for volume production of the three-dimensional porous meshed electrodes. The obtained grapheme electrodes can be assembled to a super-capacitor with charge-discharge time to be 0.8-4 milliseconds and internal resistance to be 0.09-0.14 ohm, and can be used for alternating current filter by replacing aluminum electrolytic capacitors.

Description

technical field [0001] The invention relates to a graphene electrode and a preparation method and application thereof. Background technique [0002] In household appliances, the AC line filter using aluminum electrolytic capacitors can filter out the remaining ripples in the AC, so as to achieve the purpose of protecting the circuit. However, aluminum electrolytic capacitors are often the largest components in electronic circuits, which limits the development of miniaturization of electrical appliances. With the demand for multifunctional portable electronic devices, it is imperative to prepare electronic circuits with high efficiency, low cost, long life, more compactness and miniaturization. Therefore, it is of great significance for the development of electronic devices to develop a capacitor with higher capacitance and smaller volume to replace the aluminum electrolytic capacitor. Supercapacitors, also known as electric double layer capacitors or electrochemical capaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/26
Inventor 石高全盛凯旋李春
Owner TSINGHUA UNIV