Synergistic fusion of vertical graphene nanosheets and carbon nanotubes for high-performance supercapacitor electrodes

Seo, Donghan, Yick, Samuel, Han, Zhao, Fang, Jinghua, & Ostrikov, Kostya (2014) Synergistic fusion of vertical graphene nanosheets and carbon nanotubes for high-performance supercapacitor electrodes. ChemSusChem: chemistry and sustainability, energy and materials, 7(8), pp. 2317-2324.

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Graphene and carbon nanotubes (CNTs) are attractive electrode materials for supercapacitors. However, challenges such as the substrate-limited growth of CNTs, nanotube bundling in liquid electrolytes, under-utilized basal planes, and stacking of graphene sheets have so far impeded their widespread application. Here we present a hybrid structure formed by the direct growth of CNTs onto vertical graphene nanosheets (VGNS). VGNS are fabricated by a green plasma-assisted method to break down and reconstruct a natural precursor into an ordered graphitic structure. The synergistic combination of CNTs and VGNS overcomes the challenges intrinsic to both materials. The resulting VGNS/CNTs hybrids show a high specific capacitance with good cycling stability. The charge storage is based mainly on the non-Faradaic mechanism. In addition, a series of optimization experiments were conducted to reveal the critical factors that are required to achieve the demonstrated high supercapacitor performance.

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19 citations in Web of Science®

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ID Code: 88861
Item Type: Journal Article
Refereed: Yes
Keywords: carbon;electrochemistry;graphene;nanotubes;plasma chemistry
DOI: 10.1002/cssc.201402045
ISSN: 1864-5631
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 12 Oct 2015 03:54
Last Modified: 12 Oct 2015 03:57

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