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Preparation method three-dimensional porous graphene skeleton

A technology of graphene skeleton and three-dimensional pores, which is applied in the field of preparation of graphene skeletons, can solve the problems of difficult preparation of high-performance and high-stability three-dimensional porous structure graphene, reduction of graphene electrical and thermal properties, and graphene pores. Oversize and other problems, to achieve the effect of improved material performance, simple method, and improved quality

Active Publication Date: 2015-04-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation methods of three-dimensional porous graphene mainly contain the following several: 1, gel sol method (Cong, et al.ACS Nano., 2012,6,2693; Tang, et al.J.Am.Chem.Soc ., 2011,133,9262), this method generally starts from graphene oxide and needs to add organic matter such as crosslinking agent in the preparation process, which reduces the electrical and thermal properties of graphene and limits its further practical application; 2. Chemical Vapor deposition method (CVD method) (Cheng, et al.Nat.Mater., 2011, 10, 424; Cao.et al.Small., 2013, 9, 1703.), this three-dimensional network material has a unique shape of three-dimensional network The appearance characteristics and unique physical and chemical properties of graphene, high porosity and large specific surface area, but the templates used are metal templates such as copper and nickel, and the pores of the obtained graphene are too large, and the templates are removed by etching solution The process often destroys its three-dimensional pore-like structure, which limits its application
Therefore, it is currently difficult to prepare high-performance, high-stability three-dimensional porous graphene

Method used

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  • Preparation method three-dimensional porous graphene skeleton
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  • Preparation method three-dimensional porous graphene skeleton

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specific Embodiment approach 1

[0021] Specific embodiment one: the preparation method of a kind of three-dimensional porous graphene skeleton of the present embodiment is to carry out according to the following steps:

[0022] 1. Put 500mg of graphite oxide in a quartz tube, and use a molecular pump to vacuum the inside of the quartz tube to 8×10 -4 ~9×10 -4 Pa, close the pumping valve of the molecular pump, and seal the quartz tube under vacuum or gas-filled conditions;

[0023] 2. Transfer the sealed quartz tube in step 1 to a muffle furnace, heat the muffle furnace at a rate of 5-20°C / min to a temperature of 500-1200°C and keep it warm for 5-30 minutes, then take out the quartz tube and Quickly soak in ice water for 1-3 minutes;

[0024] 3. Repeat the heating-quenching process of step 2 for 1 to 9 times, and finally collect the product in the quartz tube, and the obtained product is a three-dimensional porous graphene skeleton.

[0025] This embodiment includes the following beneficial effects:

[00...

specific Embodiment approach 2

[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, the vacuum in the quartz tube is evacuated to 9×10 -4 Pa. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the gas charged in step 1 is argon or nitrogen. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a preparation method and an application of a three-dimensional porous graphene skeleton, and relates to a preparation method and an application of a graphene skeleton. The preparation method is used for solving the technical problem of difficulty in the preparation of three-dimensional porous structure graphene with high property and high stability. The preparation method comprises the following steps: sealing graphite oxide in a quartz tube under the condition of vacuum or charging gas, transferring the quartz tube to a muffle furnace, heating, carrying out heat preservation, taking out the quartz tube, rapidly immersing the quartz tube in ice water, repeating the heating-quenching process time after time, and collecting a product in the quartz tube, wherein the product is the three-dimensional porous graphene skeleton. The preparation method is simple and environmentally-friendly. The three-dimensional porous graphene skeleton with the special structure can be used for effectively enlarging the available loading area of graphene and can be widely applied to the fields of lithium ion batteries, fuel batteries, solar cells, photocatalysis, catalytic oxidation, gas sensors, medicine conveying and the like.

Description

technical field [0001] The invention relates to a preparation method of a graphene skeleton. Background technique [0002] Graphene material is a single atomic layer material with a two-dimensional honeycomb structure, which is the basic structural unit of fullerene, carbon nanotube and graphite. Since the preparation of single-layer graphene by Andre K. Geim of the University of Manchester in 2004, it has received extensive attention from the scientific and industrial circles. Graphene has excellent electrical, thermal and mechanical properties. For example, the carrier mobility of graphene is 10 times that of commercial silicon chips, reaching 15000 cm 2 V -1 S -1 (Zhang, et al. Nature., 2005, 438, 201-204.); the strength of graphene can reach 130GPa, which is more than 100 times that of steel of the same weight (A.K.Gein, Science., 2009, 324, 1530-4. ); the thermal conductivity of graphene reaches 5000W / m K, which is 3 times that of diamond at room temperature (A.A.B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 韩杰才宋波李加杰张宇民
Owner HARBIN INST OF TECH