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Iron oxide/graphene oxide nanocomposite, its preparation method, and its application in supercapacitor

A nanocomposite material and graphene technology, applied in the field of functional materials, can solve the problems of large size, unsatisfactory electrochemical performance, uneven shape, etc., and achieve uniform size, high cycle charge/discharge stability, and reaction The effect of simple and easy operation

Inactive Publication Date: 2017-10-17
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the iron oxide nanorods reported so far are large in size (tens to hundreds of nanometers) and inhomogeneous in shape, and their electrochemical performance is not satisfactory when applied to supercapacitor electrodes (Adv.Mater.2014, 26, 3148–3155; ACS Appl. Mater. Interfaces 2015, 7, 27518-27525; CrystEngComm, 2015, 17, 1906–1910)

Method used

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  • Iron oxide/graphene oxide nanocomposite, its preparation method, and its application in supercapacitor
  • Iron oxide/graphene oxide nanocomposite, its preparation method, and its application in supercapacitor
  • Iron oxide/graphene oxide nanocomposite, its preparation method, and its application in supercapacitor

Examples

Experimental program
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Embodiment 1

[0041] Example 1: Preparation of ultrafine iron oxide nanorods supported by graphene oxide

[0042] 1. Dissolve ferrous acetate in deionized water, mix and stir until it is completely dissolved, and obtain an aqueous solution of 0.02mol / L ferrous acetate;

[0043] 2. Add 388ml of the ferrous acetate solution obtained in step 1 dropwise into 435mL, 10mg / mL graphene oxide hydrosol, and stir at the same time to obtain a stable and uniform suspension. Among them, the mass ratio of iron element to graphene is 10:100;

[0044] 3. Pour the suspension obtained in step 2 into a hydrothermal reaction kettle, react at a temperature of 120°C for 12 hours, naturally cool to room temperature, wash with deionized water for 5 times and perform suction filtration to obtain graphene oxide Composite with hydrated iron oxide nanoparticles, and finally dried in an oven at 60°C for 12h. Graphene oxide-supported ultrafine iron oxide nanorod composites were obtained.

[0045] 4. The composite obta...

Embodiment 2

[0049] Example 2: Preparation of ultrafine iron oxide nanorods supported by graphene oxide

[0050] 1. Dissolve ferrous chloride in absolute ethanol, mix and stir until it is completely dissolved, and obtain an ethanol solution of 0.03mol / L ferrous chloride;

[0051] 2. Add 147ml of the iron salt solution obtained in step 1 dropwise into 225mL, 10mg / mL graphene oxide hydrosol, and stir at the same time to obtain a stable and uniform suspension. Among them, the mass ratio of iron element to graphene is 11:100;

[0052] 3. Pour the suspension obtained in step 2 into a hydrothermal reaction kettle, react at a temperature of 130°C for 24 hours, naturally cool to room temperature, wash with deionized water for 5 times and perform suction filtration to obtain graphene oxide Composite with hydrated iron oxide nanoparticles, and finally dried in an oven at 80°C for 12h. Graphene oxide-supported ultrafine iron oxide nanorod composites were obtained.

[0053] 4. The composite obtaine...

Embodiment 3

[0055] Example 3: Preparation of ultrafine iron oxide nanorods supported by graphene oxide

[0056] 1. Dissolve ferrous sulfate in dimethylformamide, mix and stir until it is completely dissolved, and obtain a solution of 0.05mol / L ferrous sulfate;

[0057] 2. Add 289ml of the iron salt solution obtained in step 1 dropwise into 450mL, 10mg / mL graphene oxide hydrosol, and stir at the same time to obtain a stable and uniform suspension. Among them, the mass ratio of iron element to graphene is 18:100;

[0058] 3. Pour the suspension obtained in step 2 into a hydrothermal reaction kettle, react at a temperature of 130°C for 24 hours, naturally cool to room temperature, wash with deionized water for 5 times and perform suction filtration to obtain graphene oxide Composite with hydrated iron oxide nanoparticles, and finally dried in an oven at 80°C for 12h. Graphene oxide-supported ultrafine iron oxide nanorod composites were obtained.

[0059] 4. The composite obtained in step ...

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Abstract

The invention discloses an iron oxide / graphene oxide nanocomposite, its preparation method, and its application in a supercapacitor. The iron oxide / graphene oxide nanocomposite is prepared in the following ways: preparing an inorganic iron salt solution; adding the inorganic iron salt solution to the hydrogel of the graphene oxide to obtain a fluid suspension; and obtaining a complex of the hydrated iron oxide nanoparticles and the graphene oxide by subjecting the fluid suspension to hydrothermal reaction, and obtaining by drying and calcination in order. The graphene oxide loaded nanorods have a diameter ranging from 3-6nm, and the average length of 55nm; and the nanorods are uniformly distributed on the surface of the graphene oxide and is free of agglomeration phenomenon. The graphene oxide loaded iron oxide nanorods can be applied to the supercapacitor. The prepared material effectively combines the characteristics of a double electric layer capacitor and a pseudocapacitor, and shows high specific capacitance (680F / g) and good cycle life (after 2000 cycles, 85% specific capacitance is maintained).

Description

technical field [0001] The invention relates to an iron oxide / graphene oxide nanocomposite material, a preparation method thereof and an application in a supercapacitor, belonging to the technical field of functional materials. Background technique [0002] Graphene and its derivatives, graphene oxide, are two-dimensional nanomaterials discovered for the first time in recent years, with very large specific surface area, excellent thermal, mechanical, electrical and optical properties. These advantages make graphene materials an ideal carrier for nanomaterials, which can not only stably disperse nanoparticles, but also maintain their inherent electronic structure and chemical properties. Moreover, the surface of graphene oxide contains a large number of oxygen-containing functional groups, which can provide sites for anchoring nanoparticles and increase interactions. Due to its safe, non-toxic, low price, and difficult to agglomerate, graphene oxide-supported iron oxide (suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/36H01G11/46B82Y30/00
CPCB82Y30/00H01G11/24H01G11/36H01G11/46H01G11/86Y02E60/13
Inventor 张成华魏宇学王毅杨勇李永旺
Owner SYNFUELS CHINA TECH CO LTD
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