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Preparation method of graphene/manganese dioxide composite electrode materials for supercapacitor

A technology of supercapacitor and manganese dioxide, which is applied in the field of nanomaterials, can solve the problems that electrons and ions cannot diffuse rapidly, the depth of bulk phase diffusion and penetration is limited, the size, shape, crystal form are difficult, etc., and reach a good market Application prospect, simple preparation method, and improved conductivity

Inactive Publication Date: 2018-04-06
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0003] Although manganese dioxide has a relatively high theoretical specific volume, as a metal oxide, its conductivity is relatively poor, for example, it will cause the following problems: 1. Electrons and ions cannot diffuse quickly and contact all surfaces of the material ; 2. Even if it touches the surface, the depth of diffusion and penetration into the bulk is limited
However, the common problem of these methods is that, limited by the synchronous reaction between graphene and manganese dioxide precursors, it is difficult to flexibly control the size, morphology, and crystal form of manganese dioxide on graphene, while the properties of manganese dioxide It is closely related to its size, shape and crystal form, which in turn affects the electrical properties of composite materials

Method used

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  • Preparation method of graphene/manganese dioxide composite electrode materials for supercapacitor
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  • Preparation method of graphene/manganese dioxide composite electrode materials for supercapacitor

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preparation example Construction

[0026] The invention provides a kind of preparation method of graphene / manganese dioxide composite electrode material for supercapacitor, comprises the following steps:

[0027] A) mixing and preheating sodium lauryl sulfate solution, sulfuric acid solution and water to obtain a mixed solution;

[0028] B) mixing and heating the mixed solution and potassium permanganate solution to obtain manganese dioxide nanosheets;

[0029] C) mixing and stirring the manganese dioxide nanosheets and the functionalized modified graphene nanosheets in water, and then centrifuging and freeze-drying to obtain a graphene / manganese dioxide composite electrode material for supercapacitors.

[0030] The present invention firstly prepares manganese dioxide nanosheets, and the specific method is:

[0031] A) mixing and preheating sodium lauryl sulfate solution, sulfuric acid solution and water to obtain a mixed solution;

[0032] B) mixing and heating the mixed solution and potassium permanganate s...

Embodiment 1

[0058] At a power of 250W and a frequency of 25kHz, ultrasonication was performed for 120min to obtain 100mL of a graphene oxide dispersion with a concentration of 0.5g / L, and 2mL of polydiallyl with a weight average molecular weight of 100000-200000 at a concentration of 0.6‰ was added to it. Dimethyl ammonium chloride modifier solution, 1.2mL hydrazine hydrate reducing agent with a mass fraction of 3%, and ammonia water was added to adjust the pH of the reaction system to PH=10. Heat the reaction in a water bath at 90°C for 3 hours to obtain a functionalized modified graphene dispersion. The resulting dispersion is centrifuged to separate the product, and after freeze-drying and drying, the functionalized modified graphene (PRGO for short) is obtained. ).

[0059] Take 283.2ml of ultrapure water in a 500°C flask, add 32ml 0.1mol / L sodium dodecyl sulfate solution (SDS) and 1ml 0.1mol / L H 2 SO 4 solution, mix well and preheat at 95°C for 15min, then measure 3.2ml of 0.05mol / ...

Embodiment 2

[0070] At a power of 250W and a frequency of 25kHz, ultrasonication was performed for 120min to obtain 100mL of a graphene oxide dispersion with a concentration of 0.5g / L, and 2mL of polydiallyl with a weight average molecular weight of 200,000-300,000 at a concentration of 0.08‰ was added to it. Dimethylammonium chloride modifier solution, 1.2mL sodium borohydride solution with a mass fraction of 4%, and ammonia water were added to adjust the pH of the reaction system to pH=10. Heating and reacting in a water bath under normal pressure at 90° C. for 2 hours to obtain a dispersion of functionalized modified graphene. The dispersion obtained from the reaction was centrifuged to separate the product, and after freeze-drying and drying, the functionalized modified graphene was obtained.

[0071] Take 283.2ml of ultrapure water in a 500°C flask, add 32ml 0.1mol / L sodium dodecyl sulfate solution (SDS) and 1ml 0.1mol / L H 2 SO 4 solution, mix well and preheat at 95°C for 15min, then...

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Abstract

The present invention provides a preparation method of graphene / manganese dioxide composite electrode materials for a supercapacitor. The method comprises the following steps of: A) performing mixingand preheating of sodium dodecyl sulfate solution, sulfuric acid solution and water, and obtaining mixed solution; B) performing mixing heating of the mixed solution and potassium permanganate solution, and obtaining a manganese dioxide nanosheet; and C) mixing and stirring the manganese dioxide nanosheet and a graphene nanosheet with functional modification in the water, then performing centrifugal separation and freeze drying, and obtaining graphene / manganese dioxide composite electrode materials for a supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of a graphene / manganese dioxide composite electrode material for a supercapacitor. Background technique [0002] The research on metal oxides as electrode materials for supercapacitors began in 1975 when Conway first studied the principle of Faraday’s pseudocapacitive energy storage ( S, Angerstein-Kozlowska H, ​​Conway BE.Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1975,60(3):359-362.), after nearly half a century of development, the current relatively classic single metal oxide electrode material Mainly RuO 2 , MnO 2 , NiO, CoO 2 etc., where MnO 2 It has a wide voltage window (1 V), only requires a relatively mild neutral electrolyte, and has the characteristics of cheap price, abundant reserves, and environmental friendliness. It is a very potential electrode material. [0003] Although manganese ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/46B82Y30/00
CPCY02E60/13H01G11/86B82Y30/00H01G11/24H01G11/46
Inventor 李永峰简健明肖良军范云
Owner GUANGDONG UNIV OF TECH
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