Carbon nanotube/graphene composite gel and preparation method thereof
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A graphene composite and carbon nanotube technology, which can be used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc. Avoid the effect of agglomeration
Inactive Publication Date: 2016-05-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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[0004] The present invention aims at providing a graphene gel with goo
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[0026] Example 1:
[0027] This embodiment provides a carbon nanotube / graphene composite gel, which has a three-dimensional porous structure, in which single-walled carbon nanotubes are interspersed in the graphene gel.
[0028] The preparation method of the carbon nanotube / graphene composite gel is as follows:
[0029] (1) Take natural graphite of 10000 mesh as raw material, adopt Hummers-Offeman method to prepare graphite oxide; then formulate the obtained graphite oxide into 4mg / ml aqueous solution, and then use ultrasonic cleaning machine to ultrasonic treatment for 3h to obtain graphene oxide aqueous solution;
[0030] (2) Take 15ml of the above graphene oxide solution into a sample bottle, then add 3mg of single-arm carbon nanotubes, and ultrasonicate for 2h to obtain a uniform dispersion of carbon nanotubes / graphene oxide, such as figure 1 As shown in the picture on the left;
[0031] (3) Transfer the sample bottle to the reaction kettle, place the reaction kettle in a constant t...
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[0033] Example 2:
[0034] This embodiment provides a carbon nanotube / graphene composite gel, which has a three-dimensional porous structure, in which single-walled carbon nanotubes are interspersed in the graphene gel.
[0035] The preparation method of the carbon nanotube / graphene composite gel is as follows:
[0036] (1) The steps of (1) in Example 1 are exactly the same;
[0037] (2) Take 15ml of the above graphene oxide solution in a sample bottle, then add 30mg of single-arm carbon nanotubes, and ultrasonicate for 2h to obtain a uniform carbon nanotube / graphene oxide dispersion;
[0038] (3) Transfer the sample bottle to the reaction kettle, place the reaction kettle in a constant temperature oven at 180°C for 12 hours, and then naturally cool to room temperature to obtain a carbon nanotube / graphene composite gel, which is taken out for washing and placed in the container Obtain an aqueous solution of carbon nanotube / graphene composite gel in a sample bottle with an aqueous solut...
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Abstract
The invention provides a carbon nanotube/graphene composite gel. In the carbon nanotube/graphene composite gel, carbon nanotubes are inserted into the graphene gel to form three-dimensional porous structure, thereby contributing to prevention of graphene interlayer agglomeration, increasing surface area, and improving the electrochemical performance of the carbon nanotube/graphene composite gel. A method for preparing the carbon nanotube/graphene composite gel comprises adding carbon nanotubes to a graphene oxide aqueous solution and dispersing the carbon nanotubes uniformly by a hydrothermal method; obtaining the carbon nanotube/graphene oxide composite gel by using thermal treatment; and obtaining the carbon nanotube/graphene composite gel by using reducing, cleaning, and drying methods. An experiment testifies that the carbon nanotube/graphene composite gel has higher conductivity than graphene gel and can be used as an electrode material. Used as the electrode material of a super capacitor, the carbon nanotube/graphene composite gel increases the specific capacitance and the power density of the super capacitor.
Description
Technical field [0001] The invention relates to the technical field of graphene gels, in particular to a carbon nanotube / graphene composite gel and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional plane of carbon atoms with sp 2 A single-atom-thick carbon material formed by interconnecting in a hybrid form has carbon atoms arranged in a hexagonal honeycomb pattern. Due to its special structural properties, graphene has many excellent physical and chemical properties, such as high mechanical strength (~1TPa) [see: (a) C. Lee, XDWei, JW Kysar, J. Hone, Science, 321 (2008)385-388.], good electrical and thermal conductivity [see: (b) P. Avouris, Zchen, V. Perebeinos, Nat Nanotechnol, 2 (2007) 605-615. (c) KSNovoselov, AK Geim, SVMorozov, D. Jiang, Y. Zhang, SV Dubonos, IV Grigorieva, AAFirsov, Science, 306 (2004) 666-669.) and a large specific surface area (2675m 2 g -1 ). These excellent properties make graphene suitable as an electrode mat...
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IPC IPC(8): H01G11/36H01G11/86
CPCY02E60/13
Inventor 牛玉芳秦禄昌田天陈友虎
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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