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

Notarianni, Marco, Liu, Jinzhang, Mirri, Francesca, Pasquali, Matteo, & Motta, Nunzio (2014) Graphene-based supercapacitor with carbon nanotube film as highly efficient current collector. Nanotechnology, 25(43), p. 435405.

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Abstract

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 μm 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).

Impact and interest:

15 citations in Scopus
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15 citations in Web of Science®

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32 since deposited on 28 Oct 2014
15 in the past twelve months

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ID Code: 78062
Item Type: Journal Article
Refereed: Yes
Keywords: Graphene, Supercapacitors, Electrochemical exfoliation, Carbon nanotube film, Current collector
DOI: 10.1088/0957-4484/25/43/435405
ISSN: 1361-6528
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Surfaces and Structural Properties of Condensed Matter (020406)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Physical Chemistry of Materials (030304)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CHEMICAL ENGINEERING (090400) > Chemical Engineering Design (090403)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Copyright Owner: Copyright 2014 IOP Publishing Ltd
Copyright Statement: This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/0957-4484/25/43/435405.
Deposited On: 28 Oct 2014 02:33
Last Modified: 02 Nov 2015 06:05

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