Preparation and application of a carbon nanosheet material with graphene-like sheet structure

A graphene sheet and carbon nanosheet technology, applied in the field of carbon nanomaterials, can solve the problems of high equipment requirements and low output, and achieve the effects of low cost, large specific capacitance and high cycle efficiency ratio

Inactive Publication Date: 2015-10-21
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the preparation methods of carbon nanoflakes are mainly plasma-enhanced chemical vapor deposition (PECVD), arc discharge method, template method, etc., and these methods not only require high equipment, but also have low output.

Method used

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  • Preparation and application of a carbon nanosheet material with graphene-like sheet structure
  • Preparation and application of a carbon nanosheet material with graphene-like sheet structure
  • Preparation and application of a carbon nanosheet material with graphene-like sheet structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 3 g of phenolic resin, wash with deionized water to remove impurities, then wash with 1 mol / L NaOH solution, deionized water and ethanol for several times, dry at 60°C and fully mix with 9g KOH; For tube furnaces, at N 2 Protected, preactivated at 250°C for 4 h, then heated to 600°C for carbonization for 6 h; taken out and exposed to air at 200°C (in a tube furnace, without N 2 protection) for secondary activation (calcination) for 3 h. The obtained carbon material was soaked in 1 mol / L HCl solution at 80°C for 12h, then cooled to room temperature, filtered, washed with deionized water until neutral, and dried at 60°C to obtain carbon nanosheets with a graphene-like structure. The carbon nanosheets have a specific surface area of ​​320 m 2 g -1 , pore volume up to 1.9cm 3 g -1 . After testing, the carbon nanosheets are used as supercapacitor electrode materials, and the specific capacitance in 6mol / L KOH electrolyte is 198Fg -1 .

Embodiment 2

[0028] Weigh 2 g of ion exchange resin, wash with deionized water to remove impurities, and then wash with 2 mol / L NaOH solution, deionized water and ethanol for several times, dry at 60 °C and mix with 4 g Ca(OH ) 2 Mix thoroughly; place in a tube furnace under N 2 Protection, pre-activation at 350°C for 4 hours, then heating to 700°C for carbonization for 6 hours; take it out and expose it to air at 200°C (same as before) for secondary activation for 3 hours. Soak the obtained carbon material in HCl solution (3 mol / L) at 80°C for 24h, then cool to room temperature, filter, wash with deionized water until neutral, and dry at 60°C to obtain carbon nanosheets with a graphene-like structure . The carbon nanosheets have a specific surface area of ​​420 m 2 g -1 , with a pore volume up to 2.3 cm 3 g -1 . After testing, the carbon nanosheets are used as supercapacitor electrode materials, and the specific capacitance in 6mol / L KOH electrolyte is 225Fg -1 .

Embodiment 3

[0030] Weigh 3 g of urea-formaldehyde resin, wash with deionized water to remove impurities, then wash with NaOH solution with a concentration of 2mol / L, deionized water and ethanol several times, dry at 60°C and mix with 6 g Ca(OH) 2 Mix well; place in a tube furnace under N 2 Protection, pre-activation at 450 °C for 4 h, and then heating to 750 °C for carbonization for 6 h; after removal, the carbonized material was exposed to air at 200 °C (same as before) for secondary activation for 3 h. Soak the obtained carbon material in HCl solution (3 mol / L) at 80°C for 12h, then cool to room temperature, filter, wash with deionized water until neutral, and dry at 60°C to obtain carbon nanosheets with a graphene-like structure . The carbon nanosheets have a specific surface area of ​​450 m 2 g -1 , with a pore volume up to 2.5 cm 3 g -1. After testing, the carbon nanosheets are used as supercapacitor electrode materials, and the specific capacitance in 6mol / L KOH electrolyte ...

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Abstract

The invention discloses a preparation method of a carbon nanosheet material with a graphene-like lamellar structure and belongs to the field of carbon nanometer materials. The preparation method comprises the steps of with macromolecule polymer which is cheap and easily available as a raw material, simply pretreating the macromolecule polymer, mixing the pretreated macromolecule polymer with an inorganic salt, carrying out activation and carbonization under the protection of nitrogen, and finally carrying out secondary activation in air to obtain a novel carbon nanosheet which is of a graphene-like lamellar structure and having a larger specific surface area and an ultrahigh hole volume. As an electrode material of a supercapacitor, the carbon nanosheet material has larger specific capacitance and excellent circulation stability and shows good electrochemical performance and high cycle efficiency ratio; in addition, the preparation method is low in the cost, is simple in the process and is beneficial to industrialization.

Description

technical field [0001] The invention belongs to the field of carbon nanomaterials, and relates to a method for preparing a carbon nanosheet material with a graphene-like sheet structure; the invention also relates to the application of the carbon nanosheet material with a graphene-like sheet structure as a supercapacitor electrode material. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the characteristics of large specific capacitance, short charging time, long service life, good temperature characteristics and environmental protection. It bridges the high power output of traditional electrostatic capacitors and the high energy storage of batteries / fuel cells, and is considered to be an ideal chemical power source in the future, so it has broad application prospects and huge economic benefits. Among the supercapacitor electrode materials, various forms of carbon materials are the earliest and most widely used. The study found...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04H01G11/44B82Y40/00C01B32/15
CPCY02E60/13
Inventor 马国富彭辉武亚娟王海平雷自强
Owner NORTHWEST NORMAL UNIVERSITY
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