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A string of red petal-based graphene porous carbon nanosheets and its preparation method and use

A technology of graphene and nanosheets, which is applied in the direction of nano-carbon, hybrid capacitor electrodes, etc., can solve the problems of cumbersome preparation process and achieve the effects of simple operation, avoiding the corrosion of equipment and chemical activation, and high effective specific surface area

Active Publication Date: 2020-02-07
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems that the biomass porous carbon graphene nanosheets prepared in the prior art need to be activated by chemical Gree and the preparation process is cumbersome, the present invention adopts a new biomass precursor: a string of red petals, and prepares biomass through encapsulation and protection strategies. Porous graphene-like carbon nanosheets

Method used

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  • A string of red petal-based graphene porous carbon nanosheets and its preparation method and use
  • A string of red petal-based graphene porous carbon nanosheets and its preparation method and use
  • A string of red petal-based graphene porous carbon nanosheets and its preparation method and use

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Experimental program
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Effect test

Embodiment 1

[0088] Wash a string of red petals with clean water to remove impurities, and after drying, crush them to 80 mesh with a pulverizer. Take 5g of a string of red petals powder and 15g of NaCl solids, add them to 50ml of water and mix evenly, heat and evaporate the water to dryness to obtain a string of red petals encapsulated by NaCl. Next, after placing the encapsulated sample in a high-temperature tube furnace, the N 2 Under the protection of 5℃·min -1 Raise the temperature to 800°C, carbonize at a constant temperature for 2 hours, take out the carbide at room temperature, and wash it with ultrapure water several times to NaCl. Finally, the product was dried to constant weight to obtain 1.01 g of a string of red petal-based graphene-like porous carbon nanosheets.

[0089] The prepared porous carbon nanosheets as figure 1 Shown has the graphene-like porous nanosheet structure, and the thickness of the prepared nanosheets is mostly concentrated in the range of 20-50nm; as f...

Embodiment 2

[0091] Wash a string of red petals with clean water to remove impurities, and after drying, crush them to 80 mesh with a pulverizer. Take 5g of a string of red petals powder and 15g of NaCl solids, add them to 50ml of water and mix evenly, heat and evaporate the water to dryness to obtain a string of red petals encapsulated by NaCl. Next, after placing the encapsulated sample in a high-temperature tube furnace, the N 2 Under the protection of 5℃·min -1 Raise the temperature to 700°C, carbonize at a constant temperature for 2 hours, take out the carbide at room temperature, and wash it with ultrapure water several times to NaCl. Finally, the product was dried to constant weight to obtain 1.15 g of a string of red petal-based graphene-like porous carbon nanosheets.

[0092] When the prepared porous carbon nanosheets are used as electrode materials for supercapacitors, at 0.5A g -1 Under the current density of , the specific capacitance of graphene-like carbon nanosheets is 32...

Embodiment 3

[0094] Wash a string of red petals with clean water to remove impurities, and after drying, crush them to 80 mesh with a pulverizer. Take 5g of a string of red petals powder and 15g of NaCl solid and add them to 100ml of water to mix evenly, heat and evaporate the water to dryness to obtain a string of red petals encapsulated by NaCl. Next, after placing the encapsulated sample in a high-temperature tube furnace, the N 2 Under the protection of 5℃·min -1 Raise the temperature to 900°C, carbonize at a constant temperature for 2 hours, take out the carbide at room temperature, and wash it with ultrapure water several times to NaCl. Finally, the product was dried to constant weight to obtain a string of red petal-based graphene-like porous carbon nanosheets of 0.83g

[0095] When the prepared porous carbon nanosheets are used as electrode materials for supercapacitors, at 0.5A g -1 The specific capacitance of graphene-like carbon nanosheets is 318F·g under the current density ...

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Abstract

The invention discloses salvia splendens petal-based porous graphene-like carbon nanosheets as well as a preparation method and an application thereof. The porous carbon nanosheets with graphene-likestructure are prepared from salvia splendens petals as a biomass precursor based on an encapsulation protection strategy. Firstly, the salvia splendens petals and a saturated encapsulant solution areuniformly mixed, then the mixture is pyrolyzed at high temperature under the protection of inert gas, and is also encapsulated and protected during pyrolysis, and the porous graphene-like carbon nanosheets are formed. The prepared porous carbon nanosheets have a graphene-like two-dimensional sheet structure, large specific surface area and strong conductivity; when used as an electrode material for a supercapacitor, the porous carbon nanosheets have high capacitance performance, good rate capability and long cycle life. The method is simple to operate, safe, environmentally friendly, economic,efficient and capable of realizing large-scale production of the porous carbon nanosheets.

Description

technical field [0001] The invention relates to a porous carbon nanosheet and a preparation method thereof, in particular to a string of red petal-based graphene-like porous carbon nanosheet and its preparation method and application, belonging to the fields of plant resource utilization and carbon nanomaterial preparation. Background technique [0002] Biomass porous carbon graphene nanosheets (or "graphene-like porous carbon nanosheets", or "GPCNs") refer to a new type of two-dimensional Material. Such materials usually have the advantages of graphene-like ultra-thin two-dimensional sheet structure, developed pores, high specific surface area, electrical conductivity comparable to graphene, good physical and chemical stability, etc., making them suitable for use in heterogeneous catalysis. , biosensing, gas adsorption and separation, and energy storage and many other fields have strong application potential. [0003] Compared with traditional bulk bioporous carbon materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15H01G11/36H01G11/24
CPCC01B32/15H01G11/24H01G11/36Y02E60/13
Inventor 黎华明刘备阳梅刘益江陈红飙
Owner XIANGTAN UNIV
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