Record Details

A supercapacitor based on longitudinal unzipping of multi-walled carbon nanotubes for high temperature application

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title A supercapacitor based on longitudinal unzipping of multi-walled carbon nanotubes for high temperature application
 
Creator SIVARAMAN, P
MISHRA, SP
POTPHODE, DD
THAKUR, AP
SHASHIDHARA, K
SAMUI, AB
BHATTACHARYYA, AR
 
Subject DOUBLE-LAYER CAPACITORS
ALUMINA TEMPLATES
ACTIVATED CARBON
ELECTRODES
PERFORMANCE
DENSITY
STORAGE
FILMS
 
Description Multi-walled carbon nanotubes (MWCNTs) were partially unzipped longitudinally by a chemical method. Unzipped multi-walled carbon nanotubes (UZ-MWCNTs) were characterized by transmission electron microscopic analysis, X-ray diffraction and Raman spectroscopic analyses. UZ-MWCNTs were utilized for electrode preparation and the electrodes were used in the fabrication of a supercapacitor. At room temperature, the UZ-MWCNTs based supercapacitor showed a specific capacitance of similar to 41 F g(-1), while pristine MWCNTs based supercapacitor exhibited 22 F g(-1) at the scan rate of 25 mV s(-1). The increase in specific capacitance was attributed to an increase in effective specific surface area of UZ-MWCNTs due to partial unzipping. UZ-MWCNTs based supercapacitor exhibited an increase in specific capacitance with increase in temperature. It showed a specific capacitance of similar to 74 F g(-1) at 100 degrees C at the scan rate of 25 mV s(-1), while the pristine MWCNTs based supercapacitor did not show any appreciable change in specific capacitance as a function of temperature. UZ-MWCNTs exhibited three-fold increase in specific capacitance as compared to pristine MWCNTs at 100 degrees C. Impedance spectroscopic analysis of the supercapacitors revealed that the UZ-MWCNTs based supercapacitor exhibited higher internal resistance and lower leakage resistance than pristine MWCNTs based supercapacitor. Continuous 'charge-discharge' cycling behaviour indicated that the UZ-MWCNTs based supercapacitor exhibited less stability during initial cycles even though it depicted higher specific capacitance as compared to the pristine MWCNTs based supercapacitor.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2016-01-15T07:25:15Z
2016-01-15T07:25:15Z
2015
 
Type Article
 
Identifier RSC ADVANCES, 5(102)83546-83557
2046-2069
http://dx.doi.org/10.1039/c5ra13136g
http://dspace.library.iitb.ac.in/jspui/handle/100/18044
 
Language en