Exfoliation of graphite oxide in propylene carbonate and thermal reduction of the resulting graphene oxide platelets.
Graphite oxide was exfoliated and dispersed in propylene carbonate (PC) by bath sonication. Heating the graphene oxide suspensions at 150 degrees C significantly reduced the graphene oxide platelets; paper samples comprising such reduced graphene oxide platelets had an electrical conductivity of 5230 S/m. By adding tetraethylammonium tetrafluoroborate (TEA BF(4)) to the reduced graphene oxide/PC slurry and making a two-cell ultracapacitor, specific capacitance values of about 120 F/g were obtained.
Zhu
Yanwu
Y
Department of Mechanical Engineering, The University of Texas, Austin, TX 78712, USA.
Stoller
Meryl D
MD
Cai
Weiwei
W
Velamakanni
Aruna
A
Piner
Richard D
RD
Chen
David
D
Ruoff
Rodney S
RS