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|Title:||Asymmetric supercapacitors based on hybrid CuO@reduced graphene oxide@sponge versus reduced graphene oxide@sponge electrodes|
|Citation:||Energy Technology, 2015; 3(2):168-176|
|Deepak P. Dubal, Nilesh R. Chodankar, Girish S. Gund, Rudolf Holze, Chandrakant D. Lokhande and Pedro Gomez-Romero|
|Abstract:||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 Na2SO4 aqueous electrolyte. Macroporous and low‐costing sponges were explored as skeletons to construct a homogeneous 3 D 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 200 mV s−1 and exhibited a maximum specific capacitance of 519 F g−1. An asymmetric supercapacitor device based on CuO@rGO@SP//rGO@SP could be cycled in the high voltage range of 1.7 V and displayed high specific capacitance of 77.84 F g−1 and a high energy density of 31.24 W h−1 kg−1. Impressively, this asymmetric device exhibited an excellent long cycle life and 83 % of the specific capacitance was retained after 2000 cycles.|
|Keywords:||Copper; electrochemistry; graphene; sponges; supercapacitors|
|Rights:||© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim|
|Appears in Collections:||Chemical Engineering publications|
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