High-performance graphene-based supercapacitors made by a scalable blade-coating approach

Wang, Bin, Liu, Jinzhang, Mirri, Francesca, Pasquali, Matteo, Motta, Nunzio, & Holmes, John W. (2016) High-performance graphene-based supercapacitors made by a scalable blade-coating approach. Nanotechnology, 27(16), Article Number:-165402.

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Abstract

Graphene oxide (GO) sheets can form liquid crystals (LCs) in their aqueous dispersions that are more viscous with a stronger LC feature. In this work we combine the viscous LC-GO solution with the blade-coating technique to make GO films, for constructing graphene-based supercapacitors in a scalable way. Reduced GO (rGO) films are prepared by wet chemical methods, using either hydrazine (HZ) or hydroiodic acid (HI). Solid-state supercapacitors with rGO films as electrodes and highly conductive carbon nanotube films as current collectors are fabricated and the capacitive properties of different rGO films are compared. It is found that the HZ-rGO film is superior to the HI-rGO film in achieving high capacitance, owing to the 3D structure of graphene sheets in the electrode. Compared to gelled electrolyte, the use of liquid electrolyte (H2SO4) can further increase the capacitance to 265 F per gram (corresponding to 52 mF per cm2) of the HZ-rGO film.

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ID Code: 93865
Item Type: Journal Article
Refereed: Yes
Keywords: Graphene, Supercapacitors, Electrochemistry
DOI: 10.1088/0957-4484/27/16/165402
ISSN: 1361-6528
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Electrochemistry (030604)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Energy Generation Conversion and Storage Engineering (091305)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Environmental Nanotechnology (100701)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Facilities: Science and Engineering Centre
Copyright Owner: Copyright 2016 Institute of Physics Publishing Ltd.
Deposited On: 17 Mar 2016 22:57
Last Modified: 20 Mar 2016 22:18

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