A kind of graphene-doped metal oxide electrode material and preparation method thereof

An electrode material, graphite electrode technology, applied in the field of electrochemical materials, can solve the problems of reducing the specific surface area and specific capacity of graphene, easy agglomeration of graphene, etc., to improve the density of active points and electrochemical roughness, the preparation method is simple, Effects of changes in microstructure and electrochemical properties

Active Publication Date: 2019-05-28
XIAMEN UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the existence of van der Waals force makes graphene easy to agglomerate, thereby reducing the specific surface area and specific capacity of graphene.

Method used

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  • A kind of graphene-doped metal oxide electrode material and preparation method thereof
  • A kind of graphene-doped metal oxide electrode material and preparation method thereof
  • A kind of graphene-doped metal oxide electrode material and preparation method thereof

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preparation example Construction

[0032] An embodiment of the present invention provides a method for preparing a graphene-doped metal oxide electrode material, comprising the following steps:

[0033] S1, obtaining a pair of graphite electrodes and an electrolyte solution, inserting the pair of graphite electrodes into the electrolyte solution, electrifying and electrolyzing, and obtaining graphene obtained by electrolysis;

[0034] S2, dissolving Ru salt, Sn salt and Co salt in a solvent to obtain a mixed metal salt solution, wherein, in the mixed metal salt solution, the atomic ratio of Ru:Sn:Co is 4:1~4:2~4 ;

[0035] S3, in the mixed metal salt solution, add the graphene, after mixing, dry to obtain the graphene-metal salt precursor;

[0036] S4, calcining the graphene-metal salt precursor at a temperature of 220° C. to 300° C. to obtain a graphene / metal oxide composite electrode material.

[0037] Further, in step S1, the electrolyte solution is a NaCl solution with a concentration of 18-22 mg / L. The ...

Embodiment 1

[0051] A graphene-doped metal oxide electrode material provided in this embodiment is prepared according to the following steps:

[0052] (1) Insert the paired graphite electrodes into the 20mg / L NaCl electrolyte, energize for electrolysis, the energizing voltage is 10mv, the current is 0.03A, and the energizing time is 24h. After the electrolysis is completed, the extracted powder is cleaned with alcohol and put into a drying box Drying, the drying temperature is 80°C, drying for 0.5h, and the graphene is collected for use;

[0053] (2) Decompose ruthenium trichloride, tin chloride and cobalt chloride in alcohol according to the atomic ratio of Ru:Sn:Co of 4:3:3 to obtain a mixed metal salt solution;

[0054] (3) in mixed metal salt solution (the total amount of metal salt is 60mg), add 6mg graphene, after mixing, dry to obtain graphene-metal salt precursor;

[0055] (4) Keep the graphene-metal salt precursor at 230°C for 10 minutes, raise the temperature to 280°C and keep i...

Embodiment 2

[0057] A graphene-doped metal oxide electrode material provided in this embodiment is prepared according to the following steps:

[0058] (1) Insert the paired graphite electrodes into the 20mg / L NaCl electrolyte, energize for electrolysis, the energizing voltage is 10mv, the current is 0.03A, and the energizing time is 24h. After the electrolysis is completed, the extracted powder is cleaned with alcohol and put into a drying box Drying, the drying temperature is 80°C, drying for 0.5h, and the graphene is collected for use;

[0059] (2) dissolving ruthenium trichloride, tin chloride and cobalt chloride in alcohol according to the atomic ratio of Ru: Sn: Co is 4:3:3 to obtain a mixed metal salt solution;

[0060] (3) in mixed metal salt solution (the total amount of metal salt is 60mg), add 6mg graphene, after mixing, dry to obtain graphene-metal salt precursor;

[0061] (4) Keep the graphene-metal salt precursor at 230°C for 10 minutes, raise the temperature to 290°C and kee...

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Abstract

The invention provides a graphene doped metallic oxide electrode material and a preparation method thereof, and relates to the technical field of electrochemical materials. According to the graphene doped metallic oxide electrode material, graphene is firstly prepared through an electrolysis method, then the graphene is mixed with a mixed salt solution of Ru, Sn and Co, and the mixture is calcinedat the temperature of 220 to 300 DEG C after drying, so that the graphene and metallic oxide composite electrode material is obtained. According to the graphene doped metallic oxide electrode material, metallic oxide and graphene are introduced for compounding, so that metal nanoparticles are embedded into adjacent graphene sheets, a double electric layer electrode material and a faradaic pseudocapacitance electrode material are reasonably compounded, and the material is good in electrical conductivity and chemical stability and has ideal specific capacitance.

Description

technical field [0001] The invention relates to the field of electrochemical materials, and in particular to a graphene-doped metal oxide electrode material and a preparation method thereof. Background technique [0002] Supercapacitors have high power density, short charging time, environmental protection and long cycle life, and have broad application prospects in electric vehicles, aerospace equipment, and consumer electronics. The performance of supercapacitors mainly depends on the choice of electrode materials. Metal oxides can obtain high pseudocapacitance based on their own redox reactions. Among them, ruthenium oxide has good stability and considerable pseudocapacitive characteristics, and is recognized as the best electrode material, but ruthenium is expensive, which limits its commercial applications. Reducing the raw material cost and manufacturing cost of ruthenium-containing electrodes is the key to realize its commercialization. By adding the second compone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/36H01G11/46B82Y30/00
CPCY02E60/13
Inventor 麻季冬朱君秋连志翔张栋兴吴杭健张厚安
Owner XIAMEN UNIV OF TECH
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