Details

Autor(en) / Beteiligte

• Notarianni, Marco
• Liu, Jinzhang
• Mirri, Francesca
• Pasquali, Matteo
• Motta, Nunzio

Titel

Graphene-based supercapacitor with carbon nanotube film as highly efficient current collector

Ist Teil von

• Nanotechnology, 2014-10, Vol.25 (43), p.435405-435405

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Flexible graphene-based thin film supercapacitors were made using carbon nanotube (CNT) films as current collectors and graphene films as electrodes. The graphene sheets were produced by simple electrochemical exfoliation, while the graphene films with controlled thickness were prepared by vacuum filtration. The solid-state supercapacitor was made by using two graphene CNT films on plastic substrates to sandwich a thin layer of gelled electrolyte. We found that the thin graphene film with thickness <1 m can greatly increase the capacitance. Using only CNT films as electrodes, the device exhibited a capacitance as low as ∼0.4 mF cm−2, whereas by adding a 360 nm thick graphene film to the CNT electrodes led to a ∼4.3 mF cm−2 capacitance. We experimentally demonstrated that the conductive CNT film is equivalent to gold as a current collector while it provides a stronger binding force to the graphene film. Combining the high capacitance of the thin graphene film and the high conductivity of the CNT film, our devices exhibited high energy density (8-14 Wh kg−1) and power density (250-450 kW kg−1).