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Three-dimensional structure multilevel-hole graphene electrode material and preparation method thereof

A technology of graphene electrode and three-dimensional structure, which is applied in the field of three-dimensional structure hierarchical porous graphene electrode material and its preparation, can solve problems such as poor performance, and achieve a simple and easy-to-operate method, excellent electrochemical stability, and high conductivity. Effect

Inactive Publication Date: 2014-09-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the defects of poor performance of existing hierarchically porous three-dimensional graphene materials, and the invention provides a three-dimensionally structured hierarchically porous graphene electrode material and a preparation method thereof

Method used

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  • Three-dimensional structure multilevel-hole graphene electrode material and preparation method thereof
  • Three-dimensional structure multilevel-hole graphene electrode material and preparation method thereof
  • Three-dimensional structure multilevel-hole graphene electrode material and preparation method thereof

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preparation example Construction

[0026] The invention relates to a three-dimensional structured hierarchical porous graphene material and a preparation method thereof, belonging to the field of energy materials. Through a simple treatment method of graphite oxide in an organic solvent, the morphology and surface properties of graphite oxide are changed, so that the reduced graphene presents a three-dimensional structure, and a hierarchical porous structure is realized after further activation. The method is environmentally friendly, simple and easy to operate, and is a material preparation process suitable for large-scale production.

[0027] The preparation method of the invention is to use an organic solvent to treat the graphite oxide to solvate the surface of the graphite oxide and make the structure wrinkle and bend. In this way, the exfoliated graphene sheets are wrinkled and bent, and are not easy to stack to form a three-dimensional structure. Then, the three-dimensional graphene is activated to incre...

Embodiment 1

[0050] Disperse 5 g of graphite oxide solids in 200 mL of ethanol, disperse ultrasonically for 2 hours to form a uniform dispersion, place the dispersion at room temperature to allow the solvent to evaporate naturally, and further vacuum-dry at 60 ° C to obtain ethanol-treated graphite oxide. Take 0.5 g of ethanol-treated graphite oxide, disperse it in 250 mL of deionized water, add 0.5 mL of hydrazine hydrate, react at 95° C. for 1 hour, filter and dry to obtain ethanol-treated graphene material. The ethanol-treated graphene material is directly mixed with KOH at a mass ratio of 1:1, activated in a nitrogen atmosphere at 800°C for 1 hour, and washed with deionized water until neutral to obtain graphene with a hierarchical porous structure;

[0051] From Figure 1a and Figure 1b It can be seen that the graphene with hierarchical porous structure prepared by the present invention presents bending folds, so it is not easy to re-stack; and it can be used as an electrode material...

Embodiment 2

[0053] 5 g of graphite oxide solids were dispersed in 150 mL of methanol, and ultrasonically dispersed for 2 hours to form a uniform dispersion. The dispersion was placed at room temperature to allow the solvent to volatilize naturally to obtain methanol-treated graphite oxide. Take 0.5 g of methanol-treated graphite oxide, disperse it in 250 mL of deionized water, add 0.5 mL of hydrazine hydrate, react at 95° C. for 1 hour, filter and dry to obtain a methanol-treated graphene material. The methanol-treated graphene material was placed in an alumina boat and activated in a carbon dioxide atmosphere at 950°C for 1 hour to obtain graphene with a hierarchical porous structure, and the BET specific surface area reached 133m 2 / g.

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Abstract

The invention provides a three-dimensional structure multilevel-hole graphene electrode material and a preparation method thereof. The preparation method comprises the steps of 1) dispersing graphite oxide into an organic solvent to obtain a graphite oxide dispersion liquid, drying, and removing the organic solvent to obtain a graphite oxide powder after solvent treatment; 2) dispersing the graphite oxide powder after the solvent treatment, obtained in the step one, into water, adding a reducing agent, carrying out reaction for 0.5-3 hours at the temperature of 90-100 DEG C; and 3) adopting strong base, zinc chloride or carbon dioxide to carry out activation treatment on the graphene obtained in the step two, and preparing the three-dimensional structure multilevel-hole graphene electrode material.

Description

technical field [0001] The invention belongs to the field of energy materials, and in particular relates to a three-dimensional structured hierarchical porous graphene electrode material and a preparation method thereof. Background technique [0002] With the increasingly severe energy problems, countries all over the world have turned their scientific and technological strength and funds to the utilization and development of new and renewable energy sources, and have invested huge sums of money in the development of pure electric or hybrid vehicles. In addition, with the development of science and technology, the gradual popularization of various computer-related electronic equipment, medical equipment, and household appliances has put forward requirements for high-performance energy storage devices. Therefore, the research on supercapacitors with higher power density and appropriate energy density has become one of the hot spots in recent years. [0003] Supercapacitor is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 胡娟黄晓
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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