Three dimensional few layer graphene and carbon nanotube foam architectures for high fidelity supercapacitors

Abstract Supercapacitors are promising alternative energy storage systems due to their relatively fastrate of energy storage and delivery. We describe a simple and scalable method to fabricatethree-dimensional (3D) few-layer graphene/multi-walled carbon nanotube (MWNT) hybridnanostructures on industrial grade metal foam foils (nickel foam) via a one-step ambientpressure chemical vapor deposition (APCVD) process. The as-grown few-layer graphene/MWNTnanocarbon foams are in the form of a homogeneous and densely packed hierarchicalnanostructures and possess a very large surface area of 743 m 2 g 1 . Symmetrical electro-chemical double-layer capacitors (EDLCs) of 3D hybrid hierarchical few-layer graphene/MWNTnanostructures show a high specific capacitance of 286 F g 1 which leads to an energy density of39.72 Wh kg 1 and a superior power density of up to 154.67 kW kg . Moreover, the capacitanceretention of 99.34% after 85000 charge–discharge cycles demonstrates the very high stability ofthe electrode architectures for supercapacitors. These merits enable the innovative 3Dhierarchical few-layer graphene/MWNT foam to serve as high performance EDLC electrodes,resulting in energy storage devices with very high stability and power density.& 2012 Elsevier Ltd. All rights reserved.2211-2855/$-see front matter & 2012 Elsevier Ltd. All rights reserved.http://dx.doi.org/10.1016/j.nanoen.2012.10.001

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