Graphene fiber with multilevel pore structure, and preparation method and application thereof

A graphene fiber, multi-level hole technology, applied in graphene, other chemical processes, hybrid capacitor electrodes, etc., can solve problems such as unfavorable electrochemical energy storage device performance improvement, reduction of electrode material device ratio, and poor processing performance. , to achieve the effect of reduced production cost, easy film processing, and increased capacity

Active Publication Date: 2015-05-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small size of this kind of material, it is not easy to form a film directly, and the processing performance becomes poor.
If a large amount of adhesive is used to form a film, some pores will be blocked, and the proportion of the electrode material in the device will be reduced, which is also not conducive to the performance improvement of the actual electrochemical energy storage device.

Method used

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  • Graphene fiber with multilevel pore structure, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Hydrated magnesium carbonate is used as the inorganic template, with a diameter of 0.01 μm and an aspect ratio of 1000:1. Put it in a fixed bed, raise the temperature to 500°C under the atmosphere of argon as the carrier, and then pass the process gas (a mixture of hydrogen, propane and argon, the volume ratio is 1:1:5) at the same temperature break down. Carbon is deposited on the inorganic fiber template to obtain a composite of carbon and inorganic fibers. After reacting for 0.01 hour, the process gas was turned off. Cool down to room temperature in hydrogen and argon (volume ratio 1:4). The solid product was taken out and treated with 0.5 mol / L hydrochloric acid at 90°C for 0.1 hour. Filtered, washed with deionized water until neutral, and dried to obtain the final product. The product is a graphene fiber with a hierarchical porous structure, with an outer diameter of 0.01 μm, an aspect ratio of 1000:1, and a specific surface area of ​​2800 m 2 / g, in the form ...

Embodiment 2

[0028] Magnesium sulfate hydrate is used as the inorganic template, with a diameter of 1 μm and an aspect ratio of 800:1. Put it in a fluidized bed, raise the temperature to 700 ° C under the atmosphere of nitrogen as the carrier, and then pass the process gas (hydrogen, a mixture of ethane, ethylene and argon, the composition ratio is 5:0.7:0.3:5 ) decompose at the same temperature. Carbon is deposited on the inorganic fiber template. A composite of carbon and inorganic fibers is obtained. After reacting for 0.1 hour, the process gas was turned off. Cool down to room temperature in hydrogen and nitrogen (volume ratio 1:2). The solid product was taken out and treated with 0.1 mol / L hydrochloric acid at 5°C for 4 hours. Filtered, washed with deionized water until neutral, and dried to obtain the final product. The product is a graphene fiber with a hierarchical porous structure, with an outer diameter of 1 μm, an aspect ratio of 800:1, and a specific surface area of ​​1500...

Embodiment 3

[0031] Magnesium oxide is used as an inorganic template with a diameter of 100 μm and an aspect ratio of 20:1. Put it in a moving bed, heat it up to 1200°C under the atmosphere of hydrogen as the carrier, and then pass the process gas (a mixture of hydrogen, methane, butanol and argon, the composition ratio is 1:4.9:0.1:5) in the Decompose at the same temperature. Carbon is deposited on the inorganic fiber template to obtain a composite of carbon and inorganic fiber. React for 2 hours, turn off the process gas. Cool down to room temperature in hydrogen and argon (volume ratio 3:4). The solid product was taken out and treated with 0.1 mol / L nitric acid at 5°C for 2 hours. Filtered, washed with deionized water until neutral, and dried to obtain the final product. The product is a graphene fiber with a hierarchical porous structure, with an outer diameter of 100 μm, an aspect ratio of 20:1, and a specific surface area of ​​500 m 2 / g.

[0032] A supercapacitor at 4V (with E...

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Abstract

A graphene fiber with a multilevel pore structure, and a preparation method and an application thereof are disclosed. The outer diameter of the graphene fiber is 0.01 to 100 [mu]m, the length-diameter ratio is 20:1 to 2000:1, and the specific surface area is 500 to 2800 m<2> / g. The preparation method comprises the steps: utilizing an inorganic fiber as a template, heating to 500 to 1200 DEG C in a carrier gas, introducing a process gas containing a C1-C8 organic compound, decomposing at the same temperature, depositing carbon on the inorganic fiber, to form a composite fiber of carbon and an inorganic matter, after cooling, treating with an acid, then filtering, washing and drying to obtain the product. The preparation method is simple; the obtained product has high purity, integral structure and strong mechanical strength, can be applicable to being used as a separation or adsorption material or an electrochemical energy storage electrode material; and when being used in an electrode material of a 4 V super capacitor, the product has the specific capacitance of 100 to 250 F / g at the scanning speed of 10 A / g.

Description

technical field [0001] The invention belongs to the technical field of carbon materials and their preparation, and in particular relates to a graphene fiber with a hierarchical porous structure and its preparation and application. Background technique [0002] Graphene is a new type of carbon nanomaterial with large specific surface area, rich pore size, and good chemical stability. It is suitable for transparent conductive display materials, electrode materials for electrochemical energy storage or catalyst carriers, and adsorption materials. Such substances can be gradually exfoliated by graphite, or by chemical deposition, or by chemical graphite oxide to prepare graphene oxide, and then reduced to obtain a two-dimensional sheet structure with a larger size and fewer layers. . However, larger sheet materials are easy to stack, which reduces the specific surface area and the pore size becomes smaller, which is not conducive to the use of electrochemical energy storage tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B01J20/20B01J20/30H01G11/24C01B32/186
CPCY02E60/13
Inventor 骞伟中崔超婕魏飞
Owner TSINGHUA UNIV
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