Role of graphene oxide liquid crystals in hydrothermal reduction and supercapacitor performance

Wang, Bin, Liu, Jinzhang, Zhao, Yi, Li, Yan, Xian, Wei, Amjadipour, Mojtaba, MacLeod, Jennifer, & Motta, Nunzio (2016) Role of graphene oxide liquid crystals in hydrothermal reduction and supercapacitor performance. ACS Applied Materials & Interfaces. (In Press)

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Abstract

The formation of liquid crystal (LC) phases in graphene oxide (GO) aqueous solution is utilized to develop high-performance supercapacitors. To investigate the effect of LC formation on the properties of subsequently reduced GO (rGO), we compare films prepared through blade-coating of viscous LC-GO solution and ultrasonic spray-coating of diluted GO aqueous dispersion. After hydrothermal reduction under identical conditions, the films show different morphology, oxygen content, and specific capacitance. Trapped water in the LC GO film plays a role in preventing restacking of sheets and facilitating the removal of oxygenated groups during the reduction process. In device architectures with either liquid or polymer electrolyte, the specific capacitance of the blade-coated film is twice as high as that of the spray-coated one. For a blade-coated film with mass loading of 0.115 mg/cm2, the specific capacitance reaches 286 F/g in aqueous electrolyte and 263 F/g in gelled electrolyte, respectively. This study suggests a route to pilot-scale production of high-performance graphene supercapacitors through blade-coated LC-GO films.

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2 citations in Scopus
1 citations in Web of Science®
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ID Code: 98293
Item Type: Journal Article
Refereed: Yes
Keywords: graphene, supercapacitors, liquid crystal, energy storage, coating
DOI: 10.1021/acsami.6b05779
ISSN: 1944-8252
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanomaterials (100708)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 American Chemical Society
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in
ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to
Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].
Deposited On: 24 Aug 2016 03:03
Last Modified: 29 Aug 2016 17:02

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