Graphene-based hydrogel and preparation method thereof as well as preparation method and application of supercapacitor electrode taking graphene-based hydrogel as active material

A supercapacitor, graphene-based technology, applied in the direction of capacitors, graphene, electrolytic capacitors, etc., can solve the problem of reducing agent toxicity, complexity, etc., and achieve the effect of improving high rate performance, high effective area, and large aperture

Active Publication Date: 2012-10-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the technical problem that the reducing agent used in the existing graphene hydrogel preparation method is toxic and the operation is co

Method used

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  • Graphene-based hydrogel and preparation method thereof as well as preparation method and application of supercapacitor electrode taking graphene-based hydrogel as active material
  • Graphene-based hydrogel and preparation method thereof as well as preparation method and application of supercapacitor electrode taking graphene-based hydrogel as active material
  • Graphene-based hydrogel and preparation method thereof as well as preparation method and application of supercapacitor electrode taking graphene-based hydrogel as active material

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specific Embodiment approach 1

[0035] Embodiment 1: The graphene-based hydrogel of this embodiment is a hydrogel formed of graphene, and the water in the hydrogel accounts for 90% to 99.5% of the total mass.

specific Embodiment approach 2

[0036] Embodiment 2: This embodiment differs from Embodiment 1 in that the water in the hydrogel accounts for 93% to 99% of the total mass. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Specific embodiment three: the preparation method of the graphene-based hydrogel described in specific embodiment one is carried out according to the following steps:

[0038] 1. Weigh graphite and reducing agent; wherein the mass ratio of graphite and reducing agent is 1: (1-1000); the reducing agent is one or a combination of KOH, NaOH, LiOH and ammonia water; when reducing agent When it is a composition, each reducing agent is combined in any ratio;

[0039] Two, the graphite oxidation that takes by step one becomes graphite oxide;

[0040] 3. According to the concentration of graphite oxide being 0.01mg / mL~50mg / mL, add the graphite oxide obtained in step 2 into water, ultrasonically peel and disperse to obtain a graphene oxide water dispersion;

[0041] 4. Add a reducing agent to the graphene oxide aqueous dispersion obtained in step 3 at a temperature of 4°C to 100°C, and reduce it under ultrasonic conditions with a frequency of 20 to 100KHz and a power of 40 to 1...

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Abstract

The invention discloses graphene-based hydrogel and a preparation method thereof as well as a preparation method and an application of a supercapacitor electrode taking the graphene-based hydrogel as an active material, and relates to a graphene material and a preparation method thereof as well as a preparation method of a supercapacitor electrode. The invention aims at solving the technical problems that a conventional preparation method of the graphene-based hydrogel utilizes a toxic reducing agent and is complex in operation. The graphene-based hydrogel disclosed by the invention is hydrogel formed by graphene or graphene and an ungraphitised carbon material. The preparation method comprises the following steps of: after oxidizing graphite into graphite oxide, dispersing the graphite oxide separately or with the ungraphitised carbon material in water to obtain graphene-based colloidal dispersion through reduction; after rotary evaporation or rotary centrifugal treatment at reduced pressure, obtaining the graphene-based hydrogel through leaching or washing; and after coating the graphene-based hydrogel on an electrode current collector, immersing the electrode current collector in electrolyte for dipping to obtain the supercapacitor electrode which can be used as the anode and/or cathode of a supercapacitor.

Description

technical field [0001] The invention relates to a graphene material, a preparation method thereof and a supercapacitor assembled therefrom. Background technique [0002] Graphene is made of sp 2 The monoatomic layer carbon film two-dimensional material composed of hybridized carbon atoms according to the hexagonal close-packed structure has excellent electrical conductivity, outstanding thermal conductivity, good chemical stability, excellent mechanical properties, and high theoretical specific surface area ( 2630m 2 / g), has become a research hotspot in the fields of energy storage, catalysis, sensing, electronics, composite materials, etc., and has broad application prospects. However, due to the strong van der Waals interaction between graphene sheets, graphene nanosheets are prone to re-stacking during the preparation and use of graphene, and the tight sheet stacking makes the surface between the sheets unable to be effectively Utilization, the actual specific surface...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01G9/042C01B32/184
CPCY02E60/13
Inventor 贾铮刘道庆朱加雄
Owner HARBIN INST OF TECH
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