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A kind of supercapacitor electrode material and preparation method thereof

A supercapacitor and electrode material technology, applied in the field of materials science, can solve the problems of supercapacitor electrode material capacitive performance and ionic conductivity, etc., and achieve the effect of good energy storage capacity, convenient operation and high specific capacitance

Active Publication Date: 2020-02-21
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned technical problems in the prior art, the invention provides a kind of nitrogen-doped graphene quantum dot / graphene supercapacitor electrode material and preparation method thereof, described this nitrogen-doped graphene quantum dot / graphite The supercapacitor electrode material and the preparation method thereof shall solve the technical problems of poor capacitive performance and ionic conductivity of the supercapacitor electrode material in the prior art

Method used

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  • A kind of supercapacitor electrode material and preparation method thereof
  • A kind of supercapacitor electrode material and preparation method thereof
  • A kind of supercapacitor electrode material and preparation method thereof

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Effect test

Embodiment 1

[0024] A nitrogen-doped graphene quantum dot / graphene-based supercapacitor electrode material, which is prepared by the following steps:

[0025] (1) Take nickel foam, clean it ultrasonically with hydrochloric acid, acetone, deionized water, and alcohol, and then vacuum-dry it.

[0026] (2) Soak the cleaned and dried nickel foam into 0.01g / L graphene solution, the hydrothermal temperature is 60 degrees, and the hydrothermal time is 4h. Take out and dry.

[0027] (3) Get 200ml of 0.02g / L nitrogen-doped graphene quantum dot solution and place it in the electrolytic cell. Nitrogen-doped graphene quantum dots were deposited by cyclic voltammetry using the nickel foam deposited with graphene as the working electrode. The voltage window is 0-0.5V voltage, the number of cycles is 200 times, and the scan rate is 10mVs -1 . That is, the nitrogen-doped graphene quantum dot / graphene-based supercapacitor electrode material is obtained.

[0028] Analysis of nitrogen-doped graphene qua...

Embodiment 2

[0030] (1) Take nickel foam, clean it ultrasonically with hydrochloric acid, acetone, deionized water, and alcohol, and then vacuum-dry it.

[0031] (2) Soak the cleaned and dried nickel foam into 0.1g / L graphene solution, the hydrothermal temperature is 90 degrees, and the hydrothermal time is 6h. Take out and dry.

[0032] (3) Get 200ml of 0.5mg / L nitrogen-doped graphene quantum dot solution and place it in the electrolytic cell. Nitrogen-doped graphene quantum dots were deposited by cyclic voltammetry using the nickel foam deposited with graphene as the working electrode. The voltage window is 0-1V voltage, the number of cycles is 50 times, and the scan rate is 500mVs -1 . That is, the nitrogen-doped graphene quantum dot / graphene-based supercapacitor electrode material is obtained.

[0033] Analysis of nitrogen-doped graphene quantum dots using scanning electron microscopy image 3 . from image 3 It can be seen that the graphene nanosheets are adsorbed on the pore w...

Embodiment 3

[0035] Graphene quantum dot / graphene / nickel foam composite structure supercapacitor electrode material, it is prepared by the method for following steps:

[0036] (1) Take nickel foam, clean it ultrasonically with hydrochloric acid, acetone, deionized water, and alcohol, and then vacuum-dry it.

[0037] (2) Soak the cleaned and dried nickel foam into 1g / L graphene solution, the hydrothermal temperature is 90 degrees, and the hydrothermal time is 6h. Take out and dry.

[0038](3) Get 200ml of 0.1g / L nitrogen-doped graphene quantum dot solution and place it in the electrolytic cell. Nitrogen-doped graphene quantum dots were deposited by cyclic voltammetry using the nickel foam deposited with graphene as the working electrode. The voltage window is 0-0.8V voltage, the number of cycles is 400 times, and the scan rate is 200mVs -1 . That is, the nitrogen-doped graphene quantum dot / graphene-based supercapacitor electrode material is obtained.

[0039] Analysis of nitrogen-doped...

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Abstract

The invention provides a nitrogen-doped graphene quantum dot / graphene supercapacitor electrode material. Graphene and graphene quantum dots are loaded on foamed nickel. The invention further providesa preparation method of the supercapacitor electrode material. The foamed nickel is used as a substrate. Firstly a hydrothermal method is used to load graphene, and then an electrochemical method is used to deposit the nitrogen-doped graphene quantum dots. According to the invention, the supercapacitor electrode material has high specific capacitance and good structural stability and cycle stability, and the specific capacitance is up to 1064 F / g (calculated according to the mass of graphene); and the nitrogen-doped graphene quantum dot / graphene composite-structured supercapacitor electrode material has high specific energy and a stable working window in neutral Na2SO4, Li2SO4 and other solutions and alkaline NaOH, KOH and other solutions, and can be applied to power supply applications requiring for a neutral electrolyte, an alkaline electrolyte, high stability and high power.

Description

technical field [0001] The invention belongs to the field of materials science and relates to an electrode material, specifically a nitrogen-doped graphene quantum dot / graphene supercapacitor electrode material and a preparation method thereof. Background technique [0002] As a new type of electrochemical energy storage unit, supercapacitor is one of the most promising electrochemical energy storage technologies. At present, the research focus of supercapacitors is to increase the energy density and power density, and to develop electrode materials with specific surface area, high conductivity and stable structure. Graphene has the advantages of high specific surface area and good conductivity, and is an ideal electrode material for supercapacitors. Graphene is used as an electrode material for supercapacitors, but there are the following technical problems: (1) Stacking is prone to occur during the preparation of graphene-based electrodes, which affects the specific surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/36H01G11/30H01G11/26H01G11/86
CPCH01G11/26H01G11/30H01G11/32H01G11/36H01G11/86Y02E60/13
Inventor 陈爱英张甜甜蒋宝坤王坤王现英
Owner UNIV OF SHANGHAI FOR SCI & TECH