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Graphene-loaded lamellar cupric oxide composite material and hydro-thermal synthesis method thereof

A composite material and hydrothermal synthesis technology, which is applied in the field of electrochemistry and material synthesis, can solve the problems of easy agglomeration of copper oxide materials, long charging time, and low power density, and achieve short preparation cycle, improved capacitance performance, and large output. Effect

Inactive Publication Date: 2015-02-25
HANGZHOU AOSAISI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the battery also has certain defects: long charging time, relatively low power density, etc.
However, CuO has fatal shortcomings as a capacitor material: poor conductivity, and copper oxide materials are easy to agglomerate

Method used

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  • Graphene-loaded lamellar cupric oxide composite material and hydro-thermal synthesis method thereof
  • Graphene-loaded lamellar cupric oxide composite material and hydro-thermal synthesis method thereof
  • Graphene-loaded lamellar cupric oxide composite material and hydro-thermal synthesis method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one : Preparation of graphene-supported sheet-like copper oxide composites with copper nitrate as copper source.

[0032] Potassium persulfate (K 2 S 2 o 8 ) 2.5 g, phosphorus pentoxide (P 2 o 5 ) 2.5 g, dissolved in 12 mL of concentrated sulfuric acid, heated to 80°C; then 3 g of natural graphite was added to the above solution, kept at 80°C for 4.5 hours; cooled to room temperature, diluted with 500 mL of deionized water, and left standing overnight ; filter, float residual acid with 0.2 mm filter; dry in a vacuum oven at 60°C; add the obtained preoxide to 120 mL of ice-bathed concentrated sulfuric acid, slowly add 15 g of KMnO under stirring 4 , Keep the temperature below 20°C during the addition process. Then the temperature was controlled at 35°C and stirred for 2 h. Add 250 mL of deionized water to dilute, and keep the temperature below 50°C in an ice bath during the dilution process. Stir for another 2 h, add 0.7 L of deionized water, and imme...

Embodiment 2

[0036] Embodiment two : Preparation of graphene-supported sheet-like copper oxide composites with copper acetate as copper source.

[0037] Take 0.8 g of copper acetate and add it to 75 mL of deionized water, add 90 mg of graphene into it, stir for 15 min, ultrasonicate for 0.5 h, add 15 ml of 0.3M ammonium carbonate dropwise, put it into the reaction kettle, and keep the temperature at 100°C6 h. Centrifuge, wash with alcohol, and wash with water three times each to obtain the product. The capacity of the prepared material measured by electrochemical test is 321.7 F / g.

Embodiment 3

[0038] Embodiment Three : Using ethylene glycol as a solution to prepare graphene-supported sheet-like copper oxide composites.

[0039] Take 0.6 g of copper nitrate and add it to 70 mL of ethylene glycol, add 90 mg of graphene to it, stir for 15 min, sonicate for 0.5 h, add 20 ml of 0.3M ammonium bicarbonate dropwise, put it into the reaction kettle, and keep the temperature at 120 ℃4h. Centrifuge, wash with alcohol, and wash with water three times each to obtain the product. The prepared material has an electrochemical test capacity of 303.0 F / g.

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Abstract

The invention relates to a graphene-loaded lamellar cupric oxide composite material and a hydro-thermal synthesis method thereof. The composite material is characterized in that a CuO (cupric oxide) laminar and a graphene laminar are compounded, and adopts a quasi-two dimensional nano-structure. Graphene serving as a matrix skeleton has excellent conductibility, and the CuO laminar can achieve excellent conductibility through the graphene laminar, so that the apparent electric conductivity of the composite material is improved. The lamellar cupric oxide growing on two sides of the graphene is about 200 nm in width and 300 to 500 nm in length; and a composite graphene nanosheet is 1 to 100 microns in plan view size and 1 to 20 nm in thickness. The composite material is prepared through the following two typical steps: preparing pyrolysis graphene; and obtaining the graphene-loaded lamellar cupric oxide composite material through hydro-thermal synthesis. A single electrode made of the graphene-loaded lamellar cupric oxide composite material prepared by the method is high in capacitance and good in cycling performance. Therefore, the graphene-loaded lamellar cupric oxide composite material is suitable for electrode materials of super capacitors.

Description

technical field [0001] The invention relates to a graphene two-dimensional composite material used as a supercapacitor, in particular to a graphene-loaded sheet-shaped copper oxide composite material and a hydrothermal synthesis method thereof, belonging to the fields of electrochemistry and material synthesis. Background technique [0002] In recent years, with the continuous improvement of the requirements for various indicators of energy storage equipment in practical applications, the current standard design capabilities of energy storage devices can no longer meet the actual needs. Batteries have been widely used in automotive, electronics, communications, military, aerospace, medical and other fields for a long time. The energy density of batteries is relatively high, which can meet the application needs of many occasions. However, batteries also have certain disadvantages: long charging time, relatively low power density, etc. In some high-pulse applications, the bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01G3/02B82Y40/00B82Y30/00H01G11/38H01G11/46C01B32/184
CPCY02E60/13
Inventor 赵兵蒋永刘鹏马启亮蔡新辉方涛庄华徐为文
Owner HANGZHOU AOSAISI IND
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