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Preparation method of fluorosilane surface finished grapheme for supercapacitor

A supercapacitor and surface modification technology, applied in the field of nanomaterials, can solve the problems of low electric double layer formation efficiency, low electrolyte ion transmission rate, difficulty in high energy density power supercapacitors, and inability to improve the working voltage of supercapacitors, etc. Effects of wettability and conductive ion transport rate, excellent electrochemical stability, good interfacial compatibility

Inactive Publication Date: 2012-10-03
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This invention describes methods for modifying surfaces on carbon nanotubes (CNTs) by adding fluoro silanes or other chemical compounds during their manufacturing processes. These modifications improve the properties such as reducing resistance at electrical contact points while also increasing its ability to hold water molecules effectively due to strong interactions between them. Additionally, these techniques can be used without affecting any important characteristics like electronic structure or performance of CNTs themselves. Overall, this method provides an efficient way to modify the properties of CNTS's through various ways.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality (electronically conductive) and capacity of graphite composites due to their unique chemical composition and excellent adhesion property towards various solvents or liquids. Current methods involve modifying surfaces of these components through different processes like coating them with other substances, which may lead to reduced lifespan and cycling instabilities over multiple cycles. Additionally, current techniques require expensive equipment and complicated procedures involving several steps.

Method used

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  • Preparation method of fluorosilane surface finished grapheme for supercapacitor
  • Preparation method of fluorosilane surface finished grapheme for supercapacitor
  • Preparation method of fluorosilane surface finished grapheme for supercapacitor

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Experimental program
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Effect test

Embodiment 1

[0037] Preparation of fluorosilane surface-modified graphene oxide:

[0038] 1. Preparation of water / alcohol solution

[0039] Prepare a water / alcohol solution with 200g of water and 0.2g of ethanol;

[0040] 2. Dispersed graphene oxide

[0041] Take 100mL of the prepared water / alcohol solution, and disperse 50mg of graphene oxide powder under ultrasonic frequency of 20kHz for 2h to obtain a graphene oxide dispersion;

[0042] 3. Fluorosilane hydrolysis

[0043]Take 100mL of the prepared water / alcohol solution, stir and disperse 0.01mol of trifluoromethyltrimethylsilane at a speed of 500rpm for 10min at a high speed, add 100mL of hydrochloric acid with a concentration of 0.01mol / L, and continue at 50°C at a speed of 500rpm Under high-speed stirring, the hydrolysis reaction was carried out for 10 minutes to obtain hydrolyzed trifluoromethyltrimethylsilane;

[0044] 4. Surface modification of graphene oxide

[0045] 100 mL of graphene oxide dispersion dispersed in water / alc...

Embodiment 2

[0052] Preparation of fluorosilane surface-modified graphene oxide:

[0053] 1. Preparation of water / alcohol solution

[0054] Prepare a water / alcohol solution with 100g of water and 100g of isopropanol;

[0055] 2. Dispersed graphene oxide

[0056] Take 50mL of the prepared water / alcohol solution, and disperse 50mg of graphene oxide powder under ultrasonic waves at a frequency of 100kHz for 30min to obtain a graphene oxide dispersion;

[0057] 3. Fluorosilane hydrolysis

[0058] Take 100 mL of the prepared water / alcohol solution, stir and disperse 0.01 mol trifluoropropylmethylcyclotrisiloxane at a high speed of 2000 rpm for 40 min, add 20 mL of acetic acid with a concentration of 0.05 mol / L, and continue to The hydrolysis reaction was carried out under high-speed stirring for 40 minutes to obtain hydrolyzed trifluoropropylmethylcyclotrisiloxane;

[0059] 4. Surface modification of graphene oxide

[0060] Mechanically stir 50 mL of graphene oxide dispersion in water / alco...

Embodiment 3

[0066] Preparation of fluorosilane surface-modified graphene oxide:

[0067] 1. Preparation of water / alcohol solution

[0068] Prepare water / alcohol solution with 15g water and 150g ethylene glycol;

[0069] 2. Dispersed graphene oxide

[0070] Take 25mL of the prepared water / alcohol solution, and disperse 50mg of graphene oxide powder under ultrasonic frequency of 100kHz for 30min to obtain a graphene oxide dispersion;

[0071] 3. Fluorosilane hydrolysis

[0072] Take 100mL of the prepared water / alcohol solution, stir and disperse 0.01mol of tridecafluorooctyltrimethoxysilane at a speed of 3000rpm for 120min at a high speed, add 2.0mL of phosphoric acid with a concentration of 0.1mol / L, and continue to disperse at a speed of 3000rpm at 90°C Under stirring, the hydrolysis reaction was carried out for 120 minutes to obtain hydrolyzed tridecafluorooctyltrimethoxysilane;

[0073] 4. Surface modification of graphene oxide

[0074] 25 mL of graphene oxide dispersion dispersed ...

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Abstract

A preparation method of fluorosilane surface finished grapheme for a supercapacitor comprises the following steps: uniformly dispersing graphite oxide in an aqueous/alcoholic solution to obtain graphene oxide dispersion liquid; dispersing fluorosilane in the aqueous/alcoholic solution, adding diluted acid, and carrying out the fluorosilane hydrolysis reaction under the stirring to obtain hydrolyzed fluorosilane; uniformly mixing the graphene oxide dispersion liquid and the hydrolyzed fluorosilane solution, fully reacting under the stirring to obtain fluorosilane surface finished graphene oxide aqueous/alcoholic solution, and carrying out the reduction reaction and suction filtration to obtain fluorosilane surface finished grapheme. The preparation method has the benefits that the process is simple, the raw material cost is low and available, and the production cost is low; the interlayer spacing of grapheme is increased through the luorosilane surface finish, and the specific surface area of grapheme is increased; and obtained fluorosilane surface finished grapheme has favorable wettability and electrochemical stability, so that grapheme electrodes have favorable electrochemical stability, and the graphene electrode supercapacitor with large specific capacity, high power and long service life can be obtained.

Description

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Claims

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Application Information

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Owner BOHAI UNIV
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