A novel graphene based nanocomposite for application in 3D flexible micro-supercapacitors

• Published in: Materials research express Vol. 3; no. 6; p. 65001
• Main Authors: Marasso, S L, Rivolo, P, Giardi, R, Mombello, D, Gigot, A, Serrapede, M, Benetto, S, Enrico, A, Cocuzza, M, Tresso, E, Pirri, C F
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.06.2016
• Subjects: Accumulators; Collectors; Contact; Devices; EDL; Electric contacts; Graphene; micro-supercapacitor; MoO; Nanocomposites; Oxides; pseudocapacitor; reduced graphene oxide
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/3/6/065001

In this work a hybrid graphene-based flexible micro-supercapacitor (MSC) exploiting a novel composite material was fabricated and extensively characterized. The MSC electrodes have been obtained from a synthesized composite aerogel of reduced graphene oxide and polycrystalline nanoparticles of molybdenum (IV) oxide (MoO2) and then dispersed in a solution containing poly(3,4-ethylenedioxythiophene) (PEDOT). Usually in MSCs the electrons have to percolate through the nanostructured Three-dimensional (3D) matrix in order to reach the collectors, made by metal thin films that provide electrical contacts only on the surface of active material. In the attempt to enable a more efficient charge transfer and to allow direct electrical contact without metal deposition, in this study a highly doped PEDOT acting both as current collector and as binder for the nanocomposite material has been employed. 3D MSCs were fabricated through a Lithographie, Galvanoformung, Abformung (LIGA)-like process to obtain high aspect ratio microstructures in polydimethylsiloxane replicas. Capacitance values of 94 F g−1 for the nanocomposite and of 14 mF cm−2 for the device were achieved. Moreover, bending test has demonstrated good performance preservation in a U shape conformation of the device.