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Method for preparing cobaltous oxide/graphene nanometer composite material

A nano-composite material and graphene technology, which is applied in the field of preparing cobalt oxide/graphene nano-composite materials, can solve the problems of expensive, environmental, and toxic organic substances, and achieve the effect of high loading capacity, simple process, and uniform dispersion

Active Publication Date: 2015-08-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most organics are known to be toxic and expensive
Excessive consumption will also cause a series of environmental problems

Method used

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  • Method for preparing cobaltous oxide/graphene nanometer composite material
  • Method for preparing cobaltous oxide/graphene nanometer composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The graphite oxide produced by the Hummers method was ultrasonically treated in deionized water, the ultrasonic time was 5min, the ultrasonic power was 500W, and the obtained concentration was 0.1mg mL -1 Negatively charged graphene oxide solution; 1mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 100ml of deionized water, magnetically stirred for 10min, and then NH 3 ·H 2 O and stirring continuously until the pH of the solution reaches 8, the resulting solid product is immediately centrifuged and dispersed in deionized water, left to stand for 12 h, and then ultrasonically treated for 0.5 h to obtain a positively charged cobalt hydroxide suspension. The graphene oxide aqueous solution and the cobalt hydroxide suspension are mixed according to the volume ratio of 1:5, filtered by suction, washed, and freeze-dried to obtain the cobalt hydroxide / graphene oxide precursor. Finally, the precursor was heat-treated at 250 °C for 1 h in an Ar atmosphere to obtain a specific sur...

Embodiment 2

[0027] The graphite oxide prepared by the electrochemical oxidation method was ultrasonically treated in deionized water, the ultrasonic time was 90min, the ultrasonic power was 500W, and the obtained concentration was 0.5mg mL -1 Negatively charged graphene oxide solution; 5mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 100ml of deionized water, magnetically stirred for 50min, and then NH 3 ·H 2 O and stirring continuously until the pH of the solution reaches 9, the resulting solid product is immediately centrifuged and dispersed in deionized water, left to stand for 36 h, and then ultrasonically treated for 2 h to obtain a positively charged cobalt hydroxide suspension. The graphene oxide aqueous solution and the cobalt hydroxide suspension were mixed at a ratio of 5:1, suction filtered, washed, and freeze-dried to obtain a cobalt hydroxide / graphene oxide precursor. Finally, the precursor was heat-treated at 150 °C for 6 h in an Ar atmosphere to obtain a specific surface a...

Embodiment 3

[0030] Graphite oxide produced by the Brodie method was ultrasonically treated in deionized water for 90 min and ultrasonic power of 1000 W to obtain a concentration of 5 mg mL -1 Negatively charged graphene oxide solution; 3mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 100ml of deionized water, magnetically stirred for 30min, and then NH 3 ·H 2 O and stirring continuously until the pH of the solution reaches 10, the resulting solid product is immediately centrifuged and dispersed in deionized water, left to stand for 12 h, and then ultrasonically treated for 1 h to obtain a positively charged cobalt hydroxide suspension. The graphene oxide aqueous solution and the cobalt hydroxide suspension were mixed at a ratio of 1:3, filtered by suction, washed, and freeze-dried to obtain a cobalt hydroxide / graphene oxide precursor. Finally, the precursor was heat-treated at 200 °C for 4 h under Ar atmosphere to obtain a specific surface area of ​​116.5 m2 g -1 , a cobalt oxide / reduce...

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Abstract

The invention provides a method for preparing a cobaltous oxide / graphene nanometer composite material, which comprises the steps of performing ultrasonic processing on graphite oxide in deionized water for obtaining graphene oxide solution, dissolving Co(NO3)2.6H2O into the deionized water for obtaining cobaltous nitrate solution, then dripping NH3.H2O, dispersing a generated solid product in the deionized water for preparing cobalt hydroxide colloidal solution; mixing the cobaltous nitrate solution with the cobalt hydroxide colloidal solution, performing washing and drying; and processing at the temperature of 150-500 DEG C for obtaining the cobaltous oxide / graphene nanometer composite material. The method for preparing the cobaltous oxide / graphene nanometer composite material has advantages of simple operation, high speed, large-scale production, and environment-friendly effect.

Description

[0001] Field [0002] The invention belongs to a green method for preparing cobalt oxide / graphene nano composite material. technical background [0003] Composite materials exhibit excellent electrochemical performance due to the synergy between individual components, and have potential application value in supercapacitor electrode materials (Adv. Mater., 2011, 23: 4828; Advanced Materials, 2011 23 Volume: 4828 pages) (Energy Environ.Sci., 2011, 4:1113; Energy and Environmental Science, 2011, Volume 4: 1113 pages). As a new type of carbon material, graphene has a two-dimensional planar single atomic layer structure and a super high specific surface area (2630m 2 g -1 ) and significant electronic conductivity and other unique properties, which make it a good nano-additive for composite functional materials. Recently, many researchers have devoted themselves to the synthesis of nanocomposites of transition metal oxides / hydroxides and graphene (or reduced graphene oxide). (El...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/36
CPCH01G11/36H01G11/46H01G11/86Y02E60/13
Inventor 陈成猛谢莉婧孔庆强苏方远李晓明刘卓
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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