Method for growing vertical transition metal oxide nanosheets on surface of graphene

A graphene nanosheet and graphene surface technology, applied in nanotechnology, chemical instruments and methods, nickel compounds, etc. for materials and surface science, to achieve high specific surface area, improve electrochemical performance, and improve utilization.

Active Publication Date: 2014-07-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the potential application value of the above-mentioned transition metal oxides, some researchers have synthesized different shapes and structures such as nanowires, nanosheets and nanoparticles, etc., but such composite materials are generally tiled on the surface of graphene. The morphology and structure cannot make the excellent electrochemical performance of transition metal oxides better

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment includes the following steps:

[0014] The first step: Weigh 10 mg of graphene oxide nanosheets, add them to 40 mL of deionized water, and ultrasonically disperse them for 5 minutes. The ultrasonic power is 250 W; then add 97.3 mg of Ni (NO 3 ) 2 ·6H 2 O, 150mg Co(NO 3 ) 2 ·6H 2 O, 7.7mg of sodium citrate and 35.3mg of hexamethylenetetramine, then stirred and reacted at 90°C for 3 hours at a stirring speed of 400r / m; the obtained product was centrifuged, washed 5 times with ethanol, and dried spare;

[0015] The second step: the product in the first step was calcined in a nitrogen tube furnace at 300 °C for 2 hours, and the heating rate was 1 °C min -1 ; The obtained powder is the upright nickel cobaltate nanomaterial grown on the graphene.

[0016] X-ray diffraction showed that the product was composed of graphene and nickel cobaltate. Through the supercapacitance test, the upright nickel cobalt oxide nanomaterials grown on graphene at a current...

Embodiment 2

[0018] This embodiment includes the following steps:

[0019] The first step: take 5 mg of graphene oxide nanosheets, add them to 40 mL of deionized water, and ultrasonically disperse them for 10 minutes. The ultrasonic power is 250 W; then add 75 mg of Zn (NO 3 ) 2 ·6H 2 O, 150mg Co(NO 3 ) 2 ·6H 2 O, 7.25mg of sodium citrate and 35mg of hexamethylenetetramine, then stirred and reacted at 90°C for 5 hours, the stirring speed was 400r / m; the obtained product was centrifugally separated, then washed with ethanol for 5 times, and dried for later use ;

[0020] The second step: the product in the first step was calcined in a nitrogen tube furnace at 400 °C for 2 hours, and the heating rate was 2 °C min -1 ; The obtained powder is the upright zinc cobaltate nanomaterial grown on the graphene.

[0021] X-ray diffraction showed that the product consisted of graphene and zinc cobaltate. Through the lithium-ion battery test, the upright zinc cobaltate nanomaterials grown on gra...

Embodiment 3

[0023] This embodiment includes the following steps:

[0024] Step 1: Weigh 20mg of graphene oxide nanosheets, add them to 80mL of deionized water, and disperse them ultrasonically for 15 minutes. The ultrasonic power is 250W; then add 194.6mgNi(NO 3 ) 2 ·6H 2 O, 15.4mg of sodium citrate and 70.6mg of hexamethylenetetramine, then stirred and reacted at 90°C for 6 hours, the stirring speed was 400r / m; the obtained product was centrifuged, washed 5 times with ethanol, and dried spare;

[0025] The second step: the product in the first step was calcined in a nitrogen tube furnace at 450 °C for 3 hours, and the heating rate was 3 °C min -1 ; The obtained powder is the upright nickel oxide nanomaterial grown on the graphene.

[0026] X-ray diffraction showed that the product consisted of graphene and nickel oxide. Through the supercapacitance test, the vertical nickel oxide nanomaterials grown on graphene at a current density of 10A g -1 The lower specific capacitance reaches...

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Abstract

The invention relates to a method for growing vertical transition metal oxide nanosheets on a surface of graphene. The method comprises the steps of firstly, ultrasonic separating oxidized graphene; then growing the vertical transition metal oxide nanosheets on the surface of the oxidized graphene through an oil bath manner; finally calcining in nitrogen so as to obtain the material-the graphene with vertical transition metal oxide nanosheets growing on the surface. The method has the characteristic of preparing an electrochemical material which is easy to separate, has high specific surface area and is superior to common nano materials in performances of lithium batteries and supercapacitors by a simple chemical synthesis method.

Description

technical field [0001] The present invention relates to the preparation of graphene-based inorganic metal oxide nanostructure materials, in particular to methods for growing upright transition metal oxide nanosheets on the surface of graphene for lithium-ion batteries and supercapacitors. The transition metal oxides include cobalt acid Nickel, zinc cobaltate, nickel oxide, cobalt oxide, zinc permanganate. technical background [0002] Graphene-based nanostructured composites have shown good potential as lithium-ion battery anode materials and supercapacitor electrode materials. Graphene has excellent electrical properties, such as good electrical conductivity, large specific surface area, light transmittance and chemical Stability and processability make it an electrode material for electrochemical new energy conversion and storage. Using it as a carrier to load other nanoparticles can not only effectively increase the specific surface area of ​​active components, but also s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01G53/00C01G53/04C01G51/04C01G45/12H01M4/48H01G11/46B82Y30/00B82Y40/00
CPCY02E60/10Y02E60/13
Inventor 丁书江董碧桃
Owner XI AN JIAOTONG UNIV
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