Asymmetric Supercapacitors based on Hybrid CuO@Reduced Graphene Oxide@Sponge versus Reduced Graphene Oxide@Sponge Electrodes. Issue 2 (12th January 2015)

• Record Type: Journal Article
• Authors: Dubal, Deepak P.; Chodankar, Nilesh R.; Gund, Girish S.; Holze, Rudolf; Lokhande, Chandrakant D.; Gomez‐Romero, Pedro
• Is Part Of: Energy technology. Volume 3:Issue 2(2015:Feb.)
• Page Start: 168
• Page End: 176
• Publication Date: 2015-01-12
• Subjects: Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201402170
• Languages: English
• ISSNs: 2194-4288

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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.</p> </abstract>