Graphene and preparation method thereof as well as electrode material

Abstract

The invention provides a preparation method of graphene. The preparation method comprises the following step: carbonizing an organic matter containing carbon and nitrogen to obtain graphene. The organic matter containing carbon and nitrogen is prepared by the following step: mixing a nitrogen-containing phenanthrene compound with an organic matter to obtain the organic matter containing carbon andnitrogen; the nitrogen-containing phenanthrene compound has the structure of formula I as shown in the specification, wherein R1-R8 are independently selected from alkyl, aromatic or alkoxy groups with the number of each of hydrogen atom and carbon atom being 1-12; m is equal to 0 or 1; n is equal to 0 or 1; and the organic matter is selected from one or more of vitamin, cyanamide, amino acid andnitrogen-containing dye. In the invention, a nitrogen-doped graphene material is prepared by direct carbonization of the organic matter containing carbon and nitrogen in one step, no step of removinga metal catalyst or transferring is required, the preparation process is simple and easy to operate, and the cost is saved. The invention also provides the graphene and an electrode material.

Description

technical field

[0001] The invention relates to the technical field of carbon materials, in particular to a graphene, a preparation method thereof, and an electrode material. Background technique

[0002] Graphene, as a new type of two-dimensional conductive material, is widely used in energy storage due to its ultra-high theoretical specific surface area, high charge carrier mobility, excellent mechanical properties, excellent mechanical properties and flexibility. This field has great application value and development potential. However, the graphene crystal with a complete structure has a smooth surface and an inert state, and its interaction with other media is weak. In order to make up for the defects of graphene and give full play to its excellent properties, the functional improvement of graphene has become a new research topic. Among them, element doping technology can effectively optimize the electronic structure of graphene, thereby improving its electrochemical ...

Examples

Embodiment 1

[0051] Take 1g of o-phenanthroline hydrochloride, add 20g of deionized water and 20g of ethanol, mix it with a water bath at 60°C, and dissolve it with magnetic stirring; then add 15g of melamine, continue stirring for 4h, then transfer to a blast drying oven, and dry at 100°C 12h, grinding to obtain carbon and nitrogen-containing organic matter.

[0052] The organic matter obtained above was placed in a corundum boat, and carbonized in a tube furnace at 900° C. for 2 h under an argon atmosphere to obtain nitrogen-doped wrinkled graphene with a high specific surface area.

[0053] Graphene prepared by the embodiment of the present invention 1 is carried out transmission electron microscope detection, detection result is as follows figure 1 and figure 2 shown by figure 1 and figure 2 It can be seen that the graphene sheet prepared in Example 1 of the present invention is very thin, and the number of layers is less than 5 layers.

[0054] Adopt Micromeritics ASAP-2020M phy...

Embodiment 2

[0057] Mix 2g of 1,10-phenanthroline with 10g of melamine, and grind until uniform in an agate mortar to obtain carbon and nitrogen-containing organic matter.

[0058] The organic matter obtained above was placed in a corundum boat, and carbonized in a tube furnace at 1000° C. for 4 hours in a nitrogen atmosphere to obtain nitrogen-doped wrinkled graphene with a high specific surface area.

[0059] According to the detection method of embodiment 1, the graphene prepared by the embodiment of the present invention 2 is detected, and the detection result is that the graphene sheet prepared by the embodiment of the present invention 2 is very thin, and the number of layers is below 5 layers; The specific surface area of ​​graphene is 1320m 2 g -1 , with a pore volume of 5.6 cm 3 g -1 ; The graphene prepared by Example 2 of the present invention contains three elements of C, N, and O, and the N content is 11.2 at%.

Embodiment 3

[0061] Take 1.5g of 5,6-dimethyl-1,10-phenanthroline and add it to 50g of methanol, and stir it magnetically in a water bath at 60°C; then add 10g of melamine and continue stirring until the solvent evaporates, then transfer to a blast drying oven , dried at 80°C for 12 hours, and ground to obtain organic matter containing carbon and nitrogen.

[0062] The organic matter prepared above was placed in a corundum boat, and carbonized in a tube furnace at 900°C for 2 hours under an argon atmosphere to obtain nitrogen-doped wrinkled graphene with a high specific surface area.

[0063] According to the detection method of embodiment 1, the graphene prepared by the embodiment of the present invention 3 is detected, and the detection result is that the graphene sheet prepared by the embodiment of the present invention 3 is very thin, and the number of layers is below 7 layers; The specific surface area of ​​graphene is 1288m 2 g -1 , with a pore volume of 5.2 cm 3 g -1 ; The graph...

technical field

[0001] The invention relates to the technical field of carbon materials, in particular to a graphene, a preparation method thereof, and an electrode material. Background technique

[0002] Graphene, as a new type of two-dimensional conductive material, is widely used in energy storage due to its ultra-high theoretical specific surface area, high charge carrier mobility, excellent mechanical properties, excellent mechanical properties and flexibility. This field has great application value and development potential. However, the graphene crystal with a complete structure has a smooth surface and an inert state, and its interaction with other media is weak. In order to make up for the defects of graphene and give full play to its excellent properties, the functional improvement of graphene has become a new research topic. Among them, element doping technology can effectively optimize the electronic structure of graphene, thereby improving its electrochemical ...

Examples

Embodiment 1

[0051] Take 1g of o-phenanthroline hydrochloride, add 20g of deionized water and 20g of ethanol, mix it with a water bath at 60°C, and dissolve it with magnetic stirring; then add 15g of melamine, continue stirring for 4h, then transfer to a blast drying oven, and dry at 100°C 12h, grinding to obtain carbon and nitrogen-containing organic matter.

[0052] The organic matter obtained above was placed in a corundum boat, and carbonized in a tube furnace at 900° C. for 2 h under an argon atmosphere to obtain nitrogen-doped wrinkled graphene with a high specific surface area.

[0053] Graphene prepared by the embodiment of the present invention 1 is carried out transmission electron microscope detection, detection result is as follows figure 1 and figure 2 shown by figure 1 and figure 2 It can be seen that the graphene sheet prepared in Example 1 of the present invention is very thin, and the number of layers is less than 5 layers.

[0054] Adopt Micromeritics ASAP-2020M phy...

Embodiment 2

[0057] Mix 2g of 1,10-phenanthroline with 10g of melamine, and grind until uniform in an agate mortar to obtain carbon and nitrogen-containing organic matter.

[0058] The organic matter obtained above was placed in a corundum boat, and carbonized in a tube furnace at 1000° C. for 4 hours in a nitrogen atmosphere to obtain nitrogen-doped wrinkled graphene with a high specific surface area.

[0059] According to the detection method of embodiment 1, the graphene prepared by the embodiment of the present invention 2 is detected, and the detection result is that the graphene sheet prepared by the embodiment of the present invention 2 is very thin, and the number of layers is below 5 layers; The specific surface area of ​​graphene is 1320m 2 g -1 , with a pore volume of 5.6 cm 3 g -1 ; The graphene prepared by Example 2 of the present invention contains three elements of C, N, and O, and the N content is 11.2 at%.

Embodiment 3

[0061] Take 1.5g of 5,6-dimethyl-1,10-phenanthroline and add it to 50g of methanol, and stir it magnetically in a water bath at 60°C; then add 10g of melamine and continue stirring until the solvent evaporates, then transfer to a blast drying oven , dried at 80°C for 12 hours, and ground to obtain organic matter containing carbon and nitrogen.

[0062] The organic matter prepared above was placed in a corundum boat, and carbonized in a tube furnace at 900°C for 2 hours under an argon atmosphere to obtain nitrogen-doped wrinkled graphene with a high specific surface area.

[0063] According to the detection method of embodiment 1, the graphene prepared by the embodiment of the present invention 3 is detected, and the detection result is that the graphene sheet prepared by the embodiment of the present invention 3 is very thin, and the number of layers is below 7 layers; The specific surface area of ​​graphene is 1288m 2 g -1 , with a pore volume of 5.2 cm 3 g -1 ; The graph...

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