Nitrogen-doped graphene and Co3O4 hollow nanosphere composite material as well as preparation method and application of composite material

A technology of nitrogen-doped graphene and composite materials, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of high cost, difficult preparation of oxygen reduction electrocatalyst, low activity, etc., and achieve multiple active sites , Improve the physical and chemical properties, the effect of high specific surface area

Active Publication Date: 2015-06-03
CHINA WEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the invention is to provide a kind of nitrogen-doped graphene and Co 3 o 4 Hollow nanosphere composite material and its preparation method and application. The composite material has the characteristics of high specific capacity, good cycle performance and rate performance as a battery material negative electrode, and also solves the difficulties in preparation, low activity and cost of existing oxygen reduction electrocatalysts. high problem

Method used

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  • Nitrogen-doped graphene and Co3O4 hollow nanosphere composite material as well as preparation method and application of composite material
  • Nitrogen-doped graphene and Co3O4 hollow nanosphere composite material as well as preparation method and application of composite material
  • Nitrogen-doped graphene and Co3O4 hollow nanosphere composite material as well as preparation method and application of composite material

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Experimental program
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Effect test

Embodiment 1

[0040] Preparation of nitrogen-doped graphene / Co 3 o 4 Hollow Nanosphere Composite

[0041] 1) Preparation of graphite oxide (GO) dispersion: Add 2g of colloidal graphite and 1g of sodium nitrate into 46mL of concentrated sulfuric acid cooled in an ice bath, slowly add 6g of potassium permanganate in portions, and keep stirring to keep the temperature of the reaction system below 20°C. Then the temperature was raised to about 35 °C and stirring was continued for 20 h. Add 92mL of deionized water, and the temperature of the reaction system rises rapidly. After stirring for 30 min, 142 mL of deionized water was added for dilution, and 6 mL of hydrogen peroxide (30%) was added to obtain a yellow dispersion. Suction filtration, washed with dilute hydrochloric acid (3.5%) until no SO 4 2- , and then washed with deionized water until neutral, and the resulting precipitate was vacuum-dried at 45°C for 24 hours to obtain graphite oxide. Ultrasonic disperse the prepared graphite...

Embodiment 2

[0050] Nitrogen-doped graphene / Co of the present invention 3 o 4 Lithium battery performance test of hollow nanosphere composites.

[0051] 1) Preparation of electrode sheet

[0052] Nitrogen-doped graphene / Co 3 o 4 Hollow nanosphere composite material, conductive carbon black and polyvinylidene fluoride (PVDF) are mixed at a mass ratio of 80:10:10, N-methylpyrrolidone is added to make a slurry, evenly coated on copper foil, and dried , made of electrode sheet.

[0053] 2) Battery assembly

[0054] The above-mentioned electrode sheet is used as the positive electrode of the half-cell, the lithium sheet is used as the negative electrode, and the Celgard-2400 porous membrane is used as the diaphragm, 1mol L -1 LiPF 6 Ethylene carbonate: dimethyl carbonate (volume ratio 1:1) was used as the electrolyte, and assembled into a CR2032 button cell in a glove box filled with argon.

[0055] 3) Battery performance test

[0056] Use Neware BTS battery tester for constant current...

Embodiment 3

[0058] Nitrogen-doped graphene / Co of the present invention 3 o 4 Electrocatalytic performance test of hollow nanosphere composites.

[0059] 1) Preparation of working electrode

[0060] A glassy carbon electrode with a diameter of 3 mm was polished to the mirror surface with aluminum oxide powder on the suede, ultrasonically cleaned with ethanol and deionized water for 5 min in turn, and dried naturally for use. The nitrogen-doped graphene / Co described in 1mg embodiment 2 3 o 4 Hollow nanosphere composites or commercial Pt / C catalysts were ultrasonically dispersed in 0.5mL Nafion ethanol solution (Nafion concentration was 0.05%). 5 μL of the catalyst dispersion was drop-coated on the surface of the prepared glassy carbon electrode, and dried naturally to prepare the working electrode with a catalyst loading of 141.6 μg cm -2 .

[0061] 2) Oxygen reduction electrocatalytic performance test

[0062] The catalyst-modified glassy carbon electrode is used as the working elec...

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Abstract

The invention relates to a novel composite material, and particularly relates to a preparation method and application of a nitrogen-doped graphene and cobaltosic oxide hollow nanosphere composite material. The novel composite material comprises a doped graphene substrate and cobaltosic oxide hollow nanospheres which is attached to the surface of the doped graphene substrate. Melamine resin is taken as a cross-linking reagent for integrating graphite oxide with Co<2+> into a single coordination precursor. The preparation method comprises the following steps: in a pyrolysis process of the precursor, taking the melamine resin as a new nitrogen source to uniformly dope the graphene with nitrogen, fixing cobalt oxide which is generated in situ, and finally preparing the nitrogen-doped graphene/Co3O4 hollow nanosphere composite material with a sandwich structure. The composite material has a graded porous structure, is high in specific surface area, more in active sties, good in electron conductivity and ion conductivity, and good in application prospect in the field of new energy resources and catalysis.

Description

technical field [0001] The invention relates to a new type of composite material, in particular to a nitrogen-doped graphene as a matrix, and a composite material of tricobalt tetroxide hollow nanospheres attached to the surface, and also includes a preparation method and application of the composite material. Background technique [0002] New energy and new materials are currently the focus of attention of the international community, and they are also high-tech development priorities in my country. Lithium-ion secondary battery is a new type of green energy storage power supply device, which is widely used in portable electronic products such as mobile phones and notebooks. However, the existing battery materials have low energy density and poor rate performance, which cannot meet the needs of automotive power batteries. Therefore, the research and development of battery materials (including positive and negative electrodes) with high energy density, good rate performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88B01J27/24B01J35/08B82Y30/00
CPCY02E60/50
Inventor 苟兴龙李容张萌萌
Owner CHINA WEST NORMAL UNIVERSITY
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