posted on 2018-01-23, 00:00authored byMichael
P. Down, Samuel J. Rowley-Neale, Graham C. Smith, Craig E. Banks
The
fabrication, characterization, and energy storage capacity of a graphene-oxide
(GO)-based supercapacitor device is reported. This device is fabricated
via a facile screen-printing technique, providing a highly reproducible
and flexible symmetrical supercapacitor device. The capacitive properties
of these GO devices are investigated in both aqueous electrolytes
and room temperature ionic liquids. The GO devices are shown to improve
the capacitive performance from 0.82 F g–1 displayed
by a graphitic screen, to a competitive 423 F g–1, representing a ca. 500-fold increase. The GO supercapacitor device
also exhibits an impressive power handling capability of up to 13.9
kW kg–1 and an energy density of 11.6 Wh kg–1. This work demonstrates that GO, before it has been
reduced to graphene, is a high performance supercapacitor material
of its own right.