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Preparation method of nitrogen-doped graphene electrode

A nitrogen-doped graphene and graphene technology, applied in the field of electrodes, can solve the problems of affecting the power density of supercapacitors, increasing the equivalent series resistance of electrode sheets, electrical conductivity and electrochemical stability limitations, etc., to improve production efficiency and Economic efficiency, reduction of equivalent series resistance, and effect of reducing oxygen content

Active Publication Date: 2013-03-06
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the traditional process of preparing electrode sheets (including graphene electrode sheets) is relatively complicated, and the addition of a certain binder increases the equivalent series resistance of the electrode sheet and affects the power density of the supercapacitor.
Moreover, when graphite oxide is reduced to graphene, the general oxygen content is still about 10%, so that when it is used as an electrode material, its conductivity and electrochemical stability are limited.

Method used

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  • Preparation method of nitrogen-doped graphene electrode
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  • Preparation method of nitrogen-doped graphene electrode

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preparation example Construction

[0021] The embodiment of the present invention provides a method for preparing a nitrogen-doped graphene electrode with simple process, high efficiency and low cost. The technological process of this nitrogen-doped graphene electrode preparation method is as follows figure 1 As shown, it specifically includes the following steps:

[0022] S1: obtaining graphene oxide suspension;

[0023] S2: mixing the graphene oxide suspension with a metal salt solution to prepare an electrolyte;

[0024] S3: Put at least one pair of electrode sheets connected to direct current into the electrolyte, turn on direct current for electrophoresis, obtain electrode sheets with graphene oxide deposited on the surface, and dry under vacuum conditions;

[0025] S4: performing a nitrogen doping reaction on the dried graphene oxide deposited on the surface of the electrode sheet with ammonia to obtain a nitrogen-doped graphene electrode precursor;

[0026] S5: Under the protection of hydrogen, reduci...

Embodiment 1

[0045] A preparation method for a nitrogen-doped graphene electrode, comprising the following process steps:

[0046] S11: Preparation of graphite oxide: Add 0.5g of natural flake graphite powder with a particle size of 100 mesh to 11.5mL of concentrated sulfuric acid at 0°C, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, and stir 2h, then stirred in a water bath at room temperature for 24h, slowly added 46mL of deionized water under ice bath conditions, after 15min, then added 140mL of deionized water (which contained 2.5mL of 30% hydrogen peroxide), until the color of the mixture turned bright After turning yellow, perform suction filtration, and finally wash with 250ml of 10% hydrochloric acid, suction filter, and vacuum dry at 60° C. for 48 hours to obtain graphite oxide.

[0047] S12: Preparation of graphene oxide suspension: add graphite oxide in step S11 into ethanol, and ultrasonically disperse for 30 minutes to obtain graphene...

Embodiment 2

[0054] A preparation method for a nitrogen-doped graphene electrode, comprising the following process steps:

[0055] S21: Preparation of graphite oxide: Add 0.5g of natural flake graphite powder with a particle size of 500 mesh to 11.5mL of concentrated sulfuric acid at 0°C, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, and stir 2h, then stirred in a water bath at room temperature for 24h, slowly added 46mL of deionized water under ice bath conditions, after 15min, then added 140mL of deionized water (which contained 2.5mL of 30% hydrogen peroxide), until the color of the mixture turned bright After turning yellow, perform suction filtration, and finally wash with 250ml of 10% hydrochloric acid, suction filter, and vacuum dry at 60° C. for 48 hours to obtain graphite oxide.

[0056] S22: Preparation of graphene oxide suspension: add graphite oxide in step S21 into isopropanol, and ultrasonically disperse for 30 minutes to obtain grap...

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Abstract

The invention provides a preparation method of a nitrogen-doped graphene electrode, which comprises the following steps: acquiring a graphene oxide suspension; mixing the graphene oxide suspension with a metal salt solution to obtain an electrolyte; putting at least one pair of electrode pieces connected with direct current into the electrolyte, switching on the direct current to carry out electrophoresis so as to obtain electrode pieces with graphene oxide deposited on the surface, and drying under vacuum conditions; reacting the graphene oxide deposited on the surface of the dried electrode pieces with ammonia gas to carry out nitrogen doping reaction, thereby obtaining a nitrogen-doped graphene electrode precursor; and in a hydrogen protective atmosphere, carrying out reduction reaction on the nitrogen-doped graphene electrode precursor and hydrogen to obtain the low-oxygen-content graphene-doped graphene electrode. The preparation method provided by the invention has the advantages of simple technique, high efficiency and low cost; and the nitrogen-doped graphene electrode prepared by the method has the advantages of low equivalent series resistance, high electric conductivity and low oxygen content in the nitrogen-doped graphene in the nitrogen-doped graphene electrode.

Description

technical field [0001] The invention belongs to the technical field of electrodes, in particular to a method for preparing a nitrogen-doped graphene electrode. Background technique [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004, due to its unique structure and photoelectric properties, it has received widespread attention. Single-layer graphene is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Such as: ①High strength, Young's molar mass (1,100GPa), breaking strength: (125GPa); ②High thermal conductivity (5,000W / mK); ③High electrical conductivity, carrier transport rate (200,000cm 2 / V·s); ④ high specific surface area (theoretical calculation value: 2,630m 2 / g). In particular, its high conductivity, large specific surface properties and its two-dimensional nanoscale structural pr...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01G9/00
CPCY02E60/12Y02E60/10
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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