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Porous carbon with high-volumetric-specific-capacitance composite graphene, preparation method thereof, and application thereof

A technology of composite graphene and porous carbon, applied in the field of porous carbon

Active Publication Date: 2012-10-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, due to space constraints, there are strict requirements on the volume storage capacity of electrode materials, which poses a challenge to common low-density porous carbons.

Method used

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  • Porous carbon with high-volumetric-specific-capacitance composite graphene, preparation method thereof, and application thereof
  • Porous carbon with high-volumetric-specific-capacitance composite graphene, preparation method thereof, and application thereof
  • Porous carbon with high-volumetric-specific-capacitance composite graphene, preparation method thereof, and application thereof

Examples

Experimental program
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Embodiment 1

[0069] Firstly, a resorcinol aqueous solution with a mass concentration of 0.1 g / ml and a lysine aqueous solution with a mass concentration of 3.3 mg / ml were prepared. At 25°C, add 15ml of lysine aqueous solution to 200ml, 0.5mg / ml graphene oxide aqueous solution to obtain a clear, transparent light yellow solution, then add 10ml of resorcinol aqueous solution to the above solution, and stir for 10min , to obtain a transparent bright yellow solution; then, under stirring conditions, inject 1.47g of formaldehyde aqueous solution (37wt%) into the above solution, and the color of the solution is deepened; Rotate / min centrifugation, obtain polymer-embedded graphene oxide interlayer composite; After drying at 50 DEG C for 24 hours, use inert gas protection to rise to 400 DEG C from room temperature with 3 DEG C / min, constant temperature 60min, again with 3 DEG C The heating rate of °C / min was raised from 400 °C to the final carbonization temperature of 800 °C, and the temperature w...

Embodiment 2

[0071]First, a resorcinol aqueous solution with a mass concentration of 0.1 g / ml, a 3.3 mg / ml lysine aqueous solution and a 91 mg / ml F127 solution were prepared. At 25°C, add 15ml of lysine aqueous solution to 200ml, 0.5mg / ml graphene oxide aqueous solution to obtain a clear, transparent light yellow solution, then add 10ml of resorcinol aqueous solution to the above solution, and stir 10min, a transparent bright yellow solution was obtained; under stirring conditions, 1ml of F127 ethanol aqueous solution (the ratio of ethanol to water was 1:1) was added to the above transparent bright yellow solution, and stirred for 20min; 1.47g of formaldehyde aqueous solution (37wt% ) into the above solution quickly, and the color of the solution deepened; transferred to a hydrothermal kettle, hydrothermally reacted at 120°C for 8 hours, after cooling, centrifuged at 14,000 rpm to obtain a sample, dried at 50°C for 24 hours, and protected with an inert gas Rise from room temperature to 400...

Embodiment 3

[0073] First, a resorcinol aqueous solution with a mass concentration of 0.5 g / ml and an asparagine aqueous solution with a mass concentration of 0.23 g / ml were prepared. At 25°C, add 2ml of asparagine aqueous solution to 20ml, 5mg / ml graphene oxide aqueous solution to obtain an orange transparent solution, then add 10ml of resorcinol aqueous solution to the above solution, stir for 15min, and obtain a brown transparent solution. solution; then under stirring conditions, 7.35g formaldehyde aqueous solution (37wt%) was quickly injected into the above solution, and the solution changed from a brown transparent solution to a dark gray transparent solution; transferred to an oven at 90°C for gel aging for 4h; after 50 After drying at °C for 24 hours, use an inert gas protection to rise from room temperature to 400°C at a rate of 3°C / min, and dry at a constant temperature for 60 minutes; C, keep the temperature for 120min, and get the "sandwich structure" nano carbon sheet self-ass...

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Abstract

The invention relates to porous carbon with high-volumetric-specific-capacitance composite graphene, a preparation method thereof, and an application thereof. The porous carbon comprises the raw materials of graphene oxide, hydroxyl-containing phenols and derivatives thereof (phenol, resorcinol, phloroglucin, p-hydroxybenzoic acid, or 2,4-dihydroxybenzoic acid), and aldehydes (formaldehyde, butyraldehyde, or terephthalaldehyde). A carboxyl-containing compound (amphoteric compound amino acid, malonic acid, or oxalic acid) is used for regulating the pH value of the system and for initiating a phenolic condensation polymerization reaction, such that a sandwich structure with nano-sheets embedded in a polymer is prepared. The structure is subjected to carbonization, and the porous carbon is prepared with a one-step method. The prepared porous carbon with the sandwich structure is advantaged in novel structure, simple preparation technology, high product purity, convenient application, and suitability for large-scale productions. The porous carbon shows a mass specific capacitance similar to that of a graphene-based material in the application in a super-capacitor. Also, the volumetric specific capacitance of the porous carbon is higher by a magnitude than that of the graphene-based material. Therefore, the porous carbon has great application potential and market prospect.

Description

technical field [0001] The invention relates to a kind of porous carbon with high volume specific capacitance composite graphene, and its preparation method and application belong to the field of porous carbon electrode materials. Background technique [0002] The pore structure and surface chemistry of nanostructured porous carbon can be tuned directionally, showing good application prospects in many fields. Aiming at problems such as diffusion and mass transfer in applications, current synthesis methods can prepare porous carbon materials with rich and diverse microstructures and macrostructures, such as carbon spheres, carbon fibers, carbon membranes, and monolithic carbons. Most of the currently developed carbon materials have basically the same chemical composition and physical properties in bulk phase and surface interface. For specific application requirements, such as electrochemical energy storage devices, electrode materials are required to have 1) good electronic...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01B1/04C01B32/05C01B32/182
Inventor 陆安慧郝广平李文翠
Owner DALIAN UNIV OF TECH
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