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Preparation method of Fe2O3/graphene composite material

A composite material and graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of affecting the electrochemical performance of materials, fast formation speed, and inability to obtain uniformly dispersed composite materials, etc., to achieve preparation The method is simple and easy to operate, good electrochemical performance, and obvious effect

Inactive Publication Date: 2016-04-13
SHANGHAI INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation process, due to the Fe 2 o 3 The formation of crystals is fast, and often piles up or grows into larger crystals, and a uniformly dispersed composite material cannot be obtained, which seriously affects the electrochemical performance of the material. Therefore, the preparation of graphene / Fe with controllable particle size 2 o 3 Composite materials are of great significance to the preparation of high-performance supercapacitor electrode materials

Method used

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  • Preparation method of Fe2O3/graphene composite material
  • Preparation method of Fe2O3/graphene composite material
  • Preparation method of Fe2O3/graphene composite material

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Experimental program
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Embodiment 1

[0029] 1) Prepare 30 mL of graphene oxide solution with a concentration of 0.5 g / mL, and ultrasonically treat it to obtain a uniform and transparent colloidal solution.

[0030] 2) Take 30mL of deionized water, heat it to boiling, add 2mL of saturated ferric chloride solution dropwise, keep boiling for 3min to prepare ferric hydroxide colloid, and then cool naturally.

[0031] 3) Take 2mL of ferric hydroxide colloid, slowly add the solution in 1) while stirring, and sonicate for 30min.

[0032] 4) The above solution was transferred into a 100 mL polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and kept at a constant temperature of 180° C. for 12 hours.

[0033] 5) After the hydrothermal kettle was naturally cooled, the obtained precipitate was washed three times with deionized water, and dried at 80°C. In the obtained composite material, Fe 2 o 3 The particle size is around 500nm. Its scanning electron microscope picture is as figure 1 shown.

[0034] T...

Embodiment 2

[0036] 1) Prepare 30 mL of graphene oxide solution with a concentration of 0.5 g / mL, and ultrasonically treat it to obtain a uniform and transparent colloidal solution.

[0037] 2) Transfer the solution in 1) to an ice bath, and wait for its temperature to drop to 0-5°C.

[0038] 3) Add 1 mL of saturated ferric chloride solution dropwise to the solution in 1), stir while adding, and sonicate for 30 minutes after completion.

[0039] 4) The above solution was transferred into a 100 mL polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and kept at a constant temperature of 180° C. for 12 hours.

[0040] 5) After the hydrothermal kettle was naturally cooled, the obtained precipitate was washed three times with deionized water, and dried at 80°C. In the obtained composite material, Fe 2 o 3 The particle size is about 500nm, and its scanning electron microscope picture is as follows figure 2 shown.

[0041] cv curve such as Figure 4 As shown in a, the obvious...

Embodiment 3

[0043] According to the method of embodiment 2, just do not add ice bath, directly add saturated ferric chloride solution in graphene oxide. The resulting composite material, Fe 2 o 3 The particle size is about 1.2 μm, and its scanning electron microscope picture is as follows image 3 shown.

[0044] cv curve such as Figure 4 As shown in a, the obvious redox peak indicates that the composite material exhibits good electrochemical behavior during cycling. The charge and discharge curve is as Figure 5As shown in a, at a current density of 2A / g, the capacitance reaches 297F / g.

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Abstract

The invention belongs to the technical field of a supercapacitor nanometer composite material, and particularly to a preparation method of an Fe2O3 / graphene composite material. The preparation method of the Fe2O3 / graphene composite material comprises the steps of (1), preparing a graphene oxide colloidal solution; (2) mixing the graphene oxide colloidal solution and a ferric hydroxide colloid or a saturated ferric chloride solution, and performing ultrasonic treatment; and (3) placing the mixed solution after ultrasonic treatment into a hydrothermal reactor for reaction, and after reaction finishement, performing natural cooling, washing and drying for obtaining the Fe2O3 / graphene composite material. The preparation method has advantages of simple operation and environment-friendly process. Not only can size of Fe2O3 particle diameter be effectively controlled for obtaining Fe2O3 crystals with different particle diameters, but also the Fe2O3 is dispersed in the graphene in a more uniform manner. The Fe2O3 / graphene composite material represents an excellent electrochemical performance when used as a supercapacitor nanometer composite material. Furthermore the preparation method is a novel way for preparing a controllable metal oxide in a supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of conductive materials for supercapacitors, in particular to a Fe 2 o 3 / The preparation method of graphene composite material. Background technique [0002] With the increasing demand for energy, the development of efficient energy storage devices has become an important task. Supercapacitor is a new type of energy storage device that generates electrochemical capacitance through Faraday reaction. In recent years, it has gradually been used in portable electronic devices, hybrid vehicles and electric vehicles. The performance of the electrode material of a supercapacitor largely affects its electrochemical performance. Will Fe 2 o 3 Crystals are uniformly dispersed in graphene to obtain a graphene-based composite material, which is an effective means for preparing high-performance electrode materials. However, during the preparation process, due to the Fe 2 o 3 The formation of cryst...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46H01G11/36H01G11/24
CPCY02E60/13H01G11/86H01G11/24H01G11/36H01G11/46
Inventor 蔺华林喻宁波韩生陈言伟刘金宝黄奇何抗抗余伟萍兰国贤冯晨萁付宁任济夫卢德力
Owner SHANGHAI INST OF TECH
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