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Preparation method of graphene nickel foam electrode

A graphene foam, nickel electrode technology, applied in battery electrodes, hybrid capacitor electrodes, circuits, etc., can solve problems such as unstable product quality, uneven coverage of brushing liquid, and unsuitable for mass production, so as to facilitate mass production. , to avoid the effect of easy water absorption and cheap raw materials

Active Publication Date: 2018-04-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing graphene electrodes are made of films using high vacuum, high pressure, plasma and other technologies, and some films need to be separated from the substrate, the steps are cumbersome, the process is complicated, and the energy consumption is high, so it is not suitable for mass production; The brushing method is used to apply the brushing liquid to the nickel foam. During the brushing process, uneven coverage of the brushing liquid is likely to occur, and then it needs to be dried, and it needs to be repeated many times. The operation is complicated and finally obtained Product quality is not very stable and other defects

Method used

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  • Preparation method of graphene nickel foam electrode
  • Preparation method of graphene nickel foam electrode
  • Preparation method of graphene nickel foam electrode

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preparation example Construction

[0029] The invention provides a preparation method of a graphene foamed nickel electrode, which mainly adopts the technology of combining cyclic voltammetry and potentiostatic reduction, in graphene oxide dispersion liquid and glycine-hydrochloric acid buffer solution, with foamed nickel as the substrate, to obtain The graphene foamed nickel electrode is a method for preparing a porous graphene foamed nickel electrode with good capacitive performance through simple electrochemical reduction. It solves the problems of complex production process and high energy consumption of graphene electrodes in the application process of supercapacitor energy storage devices. Realize the mass production of graphene electrodes supported by nickel foam, simplify the process and increase the specific capacitance.

[0030] The specific method is to clean and dry the nickel foam as the working electrode, use the saturated calomel electrode as the reference electrode, and the platinum sheet as the...

Embodiment 1

[0034] The preparation of embodiment 1 graphene foamed nickel electrode

[0035]The preparation method of graphene foam nickel electrode, concrete operation is as follows:

[0036] (1) Clean the nickel foam with deionized water, dilute hydrochloric acid, absolute ethanol, and acetone for 5 minutes each, and then dry it in vacuum at 80°C for 30 minutes.

[0037] (2) Preparation of graphene oxide dispersion: prepare 4 g / L graphene oxide aqueous solution according to the raw material ratio of 2 g of graphite. Specifically, take 2g of graphite powder, use the improved Hummer method (see Xu Juan., Wei Xicheng, CaoJianyu, et al., Electrochimica Acta, 2015, 152:391-397.) to prepare graphene oxide, and then ultrasonically exfoliate After 30 minutes, the graphene oxide dispersion was prepared and diluted to 500 mL.

[0038] (3) Using cyclic voltammetry, using nickel foam as a working electrode, a saturated calomel electrode as a reference electrode, and a platinum sheet as a counter ...

Embodiment 2

[0052] 1) The selected area is 1cm 2 Nickel foam is used as the substrate, and it is washed with deionized water, dilute hydrochloric acid, absolute ethanol, and acetone, respectively, for 15 minutes, 5 minutes, 15 minutes, and 5 minutes, and then dried at 110°C for 10 minutes. The frequency of ultrasonic cleaning can be 50-100kHz.

[0053] 2) Graphene oxide dispersion: take 2g / L graphene oxide solution.

[0054] It should be noted that the graphene oxide dispersion in the present invention is obtained by the oxidation step in the oxidation-reduction method, that is, the reaction of natural graphite with strong acid and strong oxidizing substances to generate graphite oxide (GO), which is dispersed by ultrasonic Prepare a graphene oxide (single-layer graphite oxide) solution and dilute it to the required concentration. The concentration of graphene oxide is based on the quality of the graphite originally used, dispersed to 2-4g / L, and the graphite that may be lost during the ...

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Abstract

The invention relates to a preparation method and application of a graphene nickel foam electrode. The preparation method comprises the steps of cleaning and drying nickel foam as a working electrode,carrying out scanning in a graphene oxide dispersion liquid by using a cyclic voltammetry to prepare a graphene oxide nickel foam electrode; and drying and then carrying out constant-potential reduction in a glycine-hydrochloric acid buffer solution to obtain the graphene nickel foam electrode. Compared with the preparation methods of other graphene electrodes, the preparation method of the graphene nickel foam electrode has the advantages of being cheap in raw materials, free of pollution, green and environment-friendly, and mass production is facilitated. The graphene nickel foam electrodesupported through the nickel foam has good capacitive performance in a neutral electrolyte and can be applied to the field of energy storage.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a preparation method and application of a graphene foamed nickel electrode. Background technique [0002] Graphene is formed by carbon atom sp 2 The honeycomb network structure formed by hybridization has a single atomic layer thickness and is an extremely thin two-dimensional structure material. Its theoretical specific surface area value is very high. Due to the special properties of graphene in light, heat, electricity, etc., such as high specific surface area and excellent electrical conductivity, graphene has a broad application space in supercapacitors, batteries, etc. [0003] There are many methods for preparing graphene, including mechanical exfoliation method, chemical vapor deposition (Chemical Vapor Deposition, CVD), oxidation-reduction method, solvent exfoliation method, solvothermal method, etc. The mechanical exfoliation method is to directly...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01M4/62H01M4/90H01M4/96G01N27/30
CPCG01N27/308H01G11/30H01G11/32H01M4/625H01M4/9083H01M4/96Y02E60/10Y02E60/50
Inventor 霍玉秋胡博
Owner NORTHEASTERN UNIV
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