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Graphene and metallic oxide composite electrode material and preparation method thereof

A technology of composite electrode and graphite electrode, which is applied in the field of electrochemical materials, can solve the problems of easy agglomeration of graphene, reduce the specific surface area and specific capacity of graphene, etc., and achieve the effect of simple preparation method, good market application prospect, and easy operation

Active Publication Date: 2018-05-11
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Graphene and metallic oxide composite electrode material and preparation method thereof
  • Graphene and metallic oxide composite electrode material and preparation method thereof
  • Graphene and metallic oxide composite electrode material and preparation method thereof

Examples

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preparation example Construction

[0023] The embodiment of the present invention provides a kind of preparation method of graphene / metal oxide composite electrode material, comprises the following steps:

[0024] 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;

[0025] S2, dissolving Ru salt, Mn 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:Mn:Co is 4:1~4:2~4 ;

[0026] S3, in the mixed metal salt solution, add the graphene, after mixing, dry to obtain the graphene-metal salt precursor;

[0027] S4, calcining the graphene-metal salt precursor at a temperature of 230° C. to 310° C. to obtain a graphene / metal oxide composite electrode material.

[0028] Further, in step S1, the electrolyte solution is a NaCl solution with a concentration of 18-22 ...

Embodiment 1

[0042] A graphene-doped metal oxide electrode material provided in this embodiment is prepared according to the following steps:

[0043] (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;

[0044] (2) dissolving ruthenium trichloride, manganese chloride and cobalt chloride in alcohol according to the atomic ratio of Ru: Mn: Co is 4:3:3 to obtain a mixed metal salt solution;

[0045] (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;

[0046](4) Keep the graphene-metal salt precursor at 240°C for 10min, raise the temperature to 290°C for 30m...

Embodiment 2

[0048] A graphene-doped metal oxide electrode material provided in this example differs from Example 1 in that the graphene-metal salt precursor is kept at 240°C for 10min, heated to 300°C for 30min, and then The temperature was lowered to 230° C. and kept for 10 minutes to obtain a graphene / metal oxide composite electrode material.

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Abstract

The invention provides a graphene and metallic oxide composite electrode material and a preparation method thereof, and relates to the technical field of electrochemical materials. According to the graphene and metallic oxide composite electrode material, graphene is firstly prepared through an electrolysis method, then the graphene is mixed with a mixed salt solution of Ru, Mn and Co, and the mixture is calcined at 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 and metallic oxide composite 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 / metal oxide composite 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 com...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/36H01G11/46
CPCY02E60/13H01G11/86H01G11/30H01G11/36H01G11/46
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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