Asymmetric supercapacitors based on hybrid CuO@reduced graphene oxide@sponge versus reduced graphene oxide@sponge electrodes
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 inte...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:307873 |
| Acceso en línea: | https://ddd.uab.cat/record/307873 https://dx.doi.org/urn:doi:10.1002/ente.201402170 |
| Access Level: | acceso abierto |
| Sumario: | 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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