Journal
CHEMSUSCHEM
Volume 7, Issue 8, Pages 2317-2324Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402045
Keywords
carbon; electrochemistry; graphene; nanotubes; plasma chemistry
Funding
- Australian Research Council (ARC)
- CSIRO's OCE Science Leadership Program
- Australian Postgraduate Award (APA)
- University Postgraduate Award (UPA)
- DECRA
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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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