Asymmetric supercapacitors based on hybrid CuO@reduced graphene oxide@sponge versus reduced graphene oxide@sponge electrodes
Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia)
Chodankar, Nilesh R. (Shivaji University. Department of Physics)
Gund, Girish S. (Shivaji University. Department of Physics)
Holze, Rudolf (Technische Universität Chemnitz)
Lokhande, Chandrakant D. (Shivaji University. Department of Physics)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Data:	2015
Resum:	An asymmetric supercapacitor was fabricated by using CuO@reduced graphene oxide@sponge (CuO@rGO@SP) composites as the positive electrode and rGO@SP as the negative electrode in NaSO aqueous electrolyte. Macroporous and low-costing sponges were explored as skeletons to construct a homogeneous 3D interconnected network of rGO. Initially, rGO was deposited on the sponge by the "dip-and-dry" method. Subsequently, a CuO nanosheet cluster was deposited by using the chemical bath deposition method on the rGO-coated sponge substrate. The CuO@rGO@SP electrodes could be operated even under a high scan rate of 200mVs and exhibited a maximum specific capacitance of 519Fg. An asymmetric supercapacitor device based on CuO@rGO@SP//rGO@SP could be cycled in the high voltage range of 1. 7V and displayed high specific capacitance of 77. 84Fg and a high energy density of 31. 24Whkg. Impressively, this asymmetric device exhibited an excellent long cycle life and 83% of the specific capacitance was retained after 2000 cycles.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Publicat a:	Energy technology (Weinheim), Vol. 3, Issue 2 (February 2015) , p. 168-176, ISSN 2194-4296

DOI: 10.1002/ente.201402170

Preprint 32 p, 1.6 MB

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