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Carbon Nanotube Based Electrochemical Supercapacitor Electrodes
Final rept. 1 Mar 2006-28 Feb 2009
GEORGIA INST OF TECH ATLANTA
Pagination or Media Count:
A specific capacitance of about 300 Fg was achieved by KOH activated PANCNT films as compared to less than 120 Fg achieved for CO2 activated samples. The PANCNT 8020 film impregnated with 6M KOH and activated at 800 deg C resulted in maximum specific capacitance. Samples activated at all process conditions resulted in narrow pore size distribution of 1-5 nm. The specific capacitance measured from this study correlated to micropore surface areas. The energy density increased from 2 WhKg in 6M KOH to 22 Whkg in BMIMBF4AC by increasing the operating voltage from 0.8 V to 3.0 V respectively. The energy density 22Whkg achieved from this study is in the range obtained for batteries. Capacitance of KOH activated PANCNT 8020 films even after 10,000 chargedischarge cycles, was substantially higher than that for the KOH activated buckypapers. Electrospun PAN, PANSAN, and PANSANCNT fiber mats as well as bulk composite films were also stabilized, carbonized, and processed into electrochemical capacitor electrodes. Results of these studies are also reported.
APPROVED FOR PUBLIC RELEASE