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Preparation method of graphene and manganous manganic oxide composite electrode material

A technology of trimanganese tetraoxide and composite electrodes, which is applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of difficult industrialization, harsh reaction conditions, and low specific capacitance, and achieve the effect of simple and convenient reaction steps and uniform particle size

Inactive Publication Date: 2015-01-28
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many preparation methods for graphene / trimanganese tetraoxide composite electrode materials, such as hydrothermal method and chemical reaction method, etc., but there are technical problems such as harsh reaction conditions, difficulty in industrialization and low specific capacitance.

Method used

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  • Preparation method of graphene and manganous manganic oxide composite electrode material
  • Preparation method of graphene and manganous manganic oxide composite electrode material
  • Preparation method of graphene and manganous manganic oxide composite electrode material

Examples

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Embodiment 1

[0025] A kind of preparation method of graphene / manganese tetraoxide composite electrode material, concrete steps are as follows:

[0026] A preparation method of a graphene / trimanganese tetraoxide composite electrode material, specifically comprising the steps of:

[0027] (1) First, mix 0.14g of graphene oxide and 2.8g of manganese chloride tetrahydrate at a mass ratio of 1:20 and add them to 200ml of isopropanol solution, ultrasonically disperse them and place them in a water bath at 83°C , and then add 20ml of potassium permanganate (1.51g) aqueous solution with a concentration of 75.5g / L. After the addition is completed, the speed is controlled at 1000r / min, and the temperature is 83°C for 30min. The obtained reaction solution is suction filtered, and the obtained filter cake Washing with distilled water until the effluent is neutral, and then drying at a controlled temperature of 50-65°C to obtain a graphene oxide / acicular manganese dioxide precursor;

[0028] The add-o...

Embodiment 2

[0037] A preparation method of a graphene / trimanganese tetraoxide composite electrode material, specifically comprising the steps of:

[0038] (1), the preparation of graphene oxide / acicular manganese dioxide precursor is the same as step (1) in Example 1;

[0039] (2) Take 0.3g of the graphene oxide / manganese dioxide precursor obtained in step (1) and ultrasonically disperse it in 300ml of distilled water to obtain an aqueous solution of the graphene oxide / manganese dioxide precursor. Add 1.5g reducing agent to the manganese precursor aqueous solution, then let it stand for 15 hours, then carry out the reduction reaction at a temperature of 83°C for 2 hours, suction filter the obtained reaction solution, wash the obtained filter cake repeatedly with distilled water until the effluent is neutral, and finally Control the temperature at 50°C-65°C for drying to obtain the graphene / trimanganese tetraoxide composite electrode material;

[0040] In the described graphene oxide / mang...

Embodiment 3

[0044] A preparation method of a graphene / trimanganese tetraoxide composite electrode material, specifically comprising the steps of:

[0045] (1), the preparation of graphene oxide / acicular manganese dioxide precursor is the same as step (1) in Example 1;

[0046] (2) Take 0.3g of the graphene oxide / manganese dioxide precursor obtained in step (1) and ultrasonically disperse it in 300ml of distilled water to obtain an aqueous solution of the graphene oxide / manganese dioxide precursor. Add 2.5g reducing agent to the manganese precursor aqueous solution, then let it stand for 15h, and then carry out the reduction reaction at 83°C for 2h, the obtained reaction liquid is suction filtered, and the obtained filter cake is repeatedly washed with distilled water until the effluent is neutral, and finally Control the temperature at 50°C-65°C for drying to obtain the graphene / trimanganese tetraoxide composite electrode material;

[0047] In the described graphene oxide / manganese dioxi...

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Abstract

The invention discloses a preparation method of graphene and manganous manganic oxide composite electrode material. The preparation method of the graphene and manganous manganic oxide composite electrode material includes: firstly, dispersing a mixture of oxidized graphene and manganese chloride tetrahydrate into isopropyl alcohol in ultrasonic mode, adding a potassium permanganate water solution into a water bath under control temperature of 83 degree centigrade for reacting for 30min so as to obtain reaction liquid, and performing suction filtration, washing and drying on the reaction liquid so as to obtain an oxidized graphene and acicular manganese dioxide precursor; then, dispersing the obtained oxidized graphene and acicular manganese dioxide precursor in distilled water in ultrasonic mode, adding a reductive agent, performing reduction reaction for 2h under control temperature of 60-90 degree centigrade after 8-24h of standing so as to obtain reaction fluid, performing the suction filtration on the reaction fluid so as to obtain a filter cake, repetitively washing the obtained filter cake through the distilled water until effluent liquid is neutral, and finally drying the filter cake under control temperature of 50-65 degree centigrade so as to obtain the graphene and manganous manganic oxide composite electrode material good in super capacitive performance. The preparation method of the graphene and manganous manganic oxide composite electrode material is simple in reaction step, does not involve severe conditions or expensive reaction devices, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a composite electrode material of graphene and trimanganese tetraoxide, belonging to the field of preparation of trimanganese tetraoxide composite materials. Background technique [0002] In today's increasingly serious environmental pollution and the gradual depletion of fossil fuels, it is particularly important to seek energy storage devices with high energy density. As an intermediate between traditional capacitors and batteries, supercapacitors have the characteristics of high energy density, long cycle life, short charging time and environmental friendliness (see ACS NANO 2010;4(5):2822—2830). It has a wide range of applications in automotive, communication, military, aerospace and other fields. Electrode materials, as the core components of supercapacitors, mainly include the following three types: carbon-based materials, metal oxides and conductive polymers; carbon-based materials have the advan...

Claims

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Application Information

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IPC IPC(8): H01G11/34H01G11/46
CPCY02E60/13H01G11/34H01G11/46
Inventor 丁芳芳张娜张骋黄成杰
Owner SHANGHAI INST OF TECH
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