Hydrothermal self-assembly and supercapacitive behaviors of Co(II) ion-modified graphene aerogels in H2SO4 electrolyte
| Autor: | Kwan San Hui, Yi Wang, Kwun Nam Hui, Xiaoting Hong, Qi Bao |
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| Rok vydání: | 2014 |
| Předmět: |
Supercapacitor
Materials science Graphene Mechanical Engineering Inorganic chemistry Infrared spectroscopy Aerogel Electrolyte Condensed Matter Physics law.invention Dielectric spectroscopy symbols.namesake Mechanics of Materials law symbols General Materials Science Cyclic voltammetry Raman spectroscopy |
| Zdroj: | Materials Research Bulletin. 56:92-97 |
| ISSN: | 0025-5408 |
| Popis: | Reduced graphene oxide (r-GO) aerogels decorated with divalent cobalt ions were synthesized via a one-pot hydrothermal self-assembly route. The interaction of Co(II) ions with 3D r-GO aerogels was investigated by spectroscopic techniques, including Raman, attenuated total reflectance infrared, and X-ray photoelectron spectroscopies. The excellent electrochemical properties of the aerogels were confirmed by cyclic voltammetry, galvanostatic charge/discharge tests, and electrochemical impedance spectroscopy in an acid electrolyte (1 M H2SO4). The Co(II) ion-modified r-GO aerogels can be used as high-performance hybrid supercapacitor materials with a specific capacitance of 387.2 Fg(-1) at 1 Ag-1 current density and a good cycling stability without capacity decay over 1000 cycles. The mechanical integrity enhancement of the hybrid r-GO aerogel framework and the improvement in its unique capacitive performance are attributed to the efficient interconnection produced by electro-active Co(II) ions. (C) 2014 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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