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Functionalization of Carbon Nanotubes and Electrochemical Performance of Its Composite Materials

Author: ChenChen
Tutor: YangWenSheng
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Carbon nanotubes Hydrotalcite Nanosheets Composite films Functionalized Supercapacitor
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 258
Quote: 0
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Abstract


This thesis is the study of carbon nanotubes by hydrothermal method using a mixed solution of concentrated sulfuric acid and concentrated nitric acid carboxy functionalized carbon nanotubes with good dispersion of carbon nanotubes in aqueous solution . Functionalized carbon nanotubes and hydrotalcite nanosheets composite film of the composite and its electrochemical performance concrete work as follows : ( 1 ) the effects of acid concentration , hydrothermal time and temperature of hydrothermal carbon nanotubes carboxyl functional , obtained by optimizing the processing conditions : when the concentration of sulfuric acid 10.3mol · L-1, the concentration of nitric acid was 4.6mol · L-1, the processing temperature is 120 ° C , the treatment time is 3 h . obtained functionalized carbon nanotubes in water dispersion stability . (2 ) after treatment of the carbon nanotube with a negative charge , and after peeling the hydrotalcite nanosheet with a positive charge , whichever is the building blocks , using an electrostatic assembly technique , preparation of a cobalt-aluminum hydrotalcite nanoflake / Multiwalled carbon nanotube composite film { ( the Co Al LDHNS / MWCNTs ) n } . UV-vis spectroscopy and QCM tests show a uniform thin film growth . We investigated ( the Co Al LDHNS / MWCNTs electrochemical performance as supercapacitor electrode materials ) n composite films . With the (Co-Al LDHNS / MWCNTs) n the number of layers increases , the specific capacitance of the film increases linearly . (Co-Al LDHNS / MWCNTs) 5 film electrode specific capacitance of 201 F · g-1, the specific capacitance after 1000 cycles , almost no change . When the charging and discharging currents from 2 Ag-1 to 8 A · g - 1 , than the capacitance remains 85 %, indicating that this composite thin film electrode having a relatively good rate characteristic .

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