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Graphene-supported cobaltosic oxide nano composite material and preparation method thereof

A technology of cobalt tetroxide nanometer and cobalt tetroxide, applied in the direction of cobalt oxide/cobalt hydroxide, etc., can solve the problems of large particle size of cobalt tetroxide and poor conductivity of the carrier, and achieve the effects of good conductivity, controllable particle size and large specific surface area.

Inactive Publication Date: 2010-08-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of poor carrier conductivity and large particle size of cobalt tetroxide in the prior art, the invention provides a graphene-supported cobalt tetroxide nanocomposite material and a preparation method thereof. The prepared material has good conductivity and cobalt tetroxide nanoparticles Controllable size

Method used

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  • Graphene-supported cobaltosic oxide nano composite material and preparation method thereof
  • Graphene-supported cobaltosic oxide nano composite material and preparation method thereof
  • Graphene-supported cobaltosic oxide nano composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 0.5 grams of graphite oxide and add 2 kilograms of deionized water and stir for 0.5 hours to prepare a graphene oxide solution, add 0.5 grams of polyvinylpyrrolidone, stir for 1 hour, then add 2 grams of cobalt nitrate hexahydrate, and stir for 1 hour;

[0026] Dissolve 0.5 g of sodium hydroxide in 200 g of deionized water, add 1 g of hydrogen peroxide, and stir for 1 hour;

[0027] The above two solutions were mixed and stirred for 2 hours, then transferred to a high-temperature reaction kettle, and annealed at 110 degrees Celsius for 10 hours to obtain the product; the product was filtered and washed several times or centrifugally washed, and then dried to obtain a graphene-supported cobalt tetraoxide nanocomposite material .

[0028] The graphene-loaded cobalt tetroxide composite material samples obtained in this example were tested by various instruments, and the test results are shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4 in the accompanying drawings.

[0029]...

Embodiment 2

[0035] Take 0.05 g of graphite oxide and add it to 1 kg of deionized water and stir for 2 hours to prepare a graphene oxide solution, then add 2 g of cobalt chloride hexahydrate and stir for 0.5 hour;

[0036] Dissolve 0.5 g of potassium hydroxide in 200 g of deionized water, add 1 g of hydrazine monohydrate, and stir for 0.5 hours;

[0037] The above two solutions were mixed and stirred for 1 hour, then transferred to a high-temperature reaction kettle, and annealed at 200 degrees Celsius for 5 hours; the product was filtered, washed, and dried to obtain a graphene-supported cobalt tetraoxide nanocomposite material, wherein the graphene nanosheet The mass fraction is 7%, the thickness of the graphene nanosheet is 1 nanometer, and the particle diameter of tricobalt tetroxide is 100 nanometers.

[0038] The graphene-loaded cobalt tetroxide composite material sample obtained in this example has the same X-ray diffraction results and energy spectrum analysis results as in Example...

Embodiment 3

[0043] Take 1 gram of graphite oxide and 2 grams of sodium dodecylbenzenesulfonate and add 100 grams of deionized water and stir for 4 hours to prepare a graphene oxide solution, then add 0.5 gram of cobalt acetate and stir for 0.5 hours;

[0044] Dissolve 1 gram of 30% ammonia water in 500 grams of deionized water, add 1 gram of potassium chlorate, and sonicate for 0.5 hours;

[0045] The above two solutions were mixed and stirred for 5 hours, then transferred to a high-temperature reaction kettle, and annealed at 250 degrees Celsius for 15 hours; the product was filtered, washed, and dried to obtain a graphene-supported cobalt trioxide nanocomposite material.

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Abstract

The invention discloses a graphene-supported cobaltosic oxide nano composite material and a preparation method thereof. The graphene-supported cobaltosic oxide nano composite material consists of graphene and cobaltosic oxide, wherein the cobaltosic oxide is loaded on graphene nano sheets; the content of the graphene nano sheets is 2 to 95 weight percent, and the thickness of the graphene nano sheets is 0.3 to 50 nanometers; and the particle size of the cobaltosic oxide is 1 to 200 nanometers and the cobaltosic oxide is ball-shaped or flaky. The preparation method comprises: firstly, mixing solution of graphene oxide, a bivalent cobalt salt and a polymer surfactant; and secondly, mixing the solution obtained by the first step with alkaline solution added with an oxidant, stirring the mixed solution or stirring the mixed solution by ultrasonic waves for 0.2 to 5 hours, transferring the mixed solution to a high-temperature reaction kettle, annealing the reaction product at 100 to 250 DEG C for 3 to 30 hours to obtain a product and washing and drying the product to obtain the graphene-supported cobaltosic oxide nano composite material. The size of the cobaltosic oxide is controllable. The reduction of the graphene oxide and the generation of the cobaltosic oxide are accomplished at the same time.

Description

Technical field: [0001] The invention relates to a method for preparing a graphene / cobalt trioxide nanocomposite material, which belongs to the technical field of nanometer inorganic materials. Background technique: [0002] Graphene is a new type of carbon material with a two-dimensional honeycomb structure formed by stacking a single layer of carbon atoms. It has attracted widespread attention since its discovery in 2004. Graphene has excellent mechanical properties and electrical properties, and can be used to prepare carbon transistors. At the same time, graphene has a high specific surface area and can be used as a carrier material for catalysts, so it has broad application prospects. [0003] Cobalt tetroxide belongs to transition metal oxide and has high oxidation activity to poisonous and harmful gases such as nitrogen monoxide and carbon monoxide, so it can be used as catalyst material and gas-sensing material. Cobalt tetroxide has a high capacitance value and can ...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01G51/04
Inventor 尹奎波孙立涛毕恒昌孙俊万能
Owner SOUTHEAST UNIV
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