Enhanced electrochemical performance of cobalt oxide nanocube intercalated reduced graphene oxide for supercapacitor application
2016
Numan, Arshid | Duraisamy, Navaneethan | Saiha Omar, Fatin | Mahipal, Y. K. | Ramēṣ, Kē. | Ramesh, S.
We investigated different molar concentrations of cobalt precursor intercalated reduced graphene oxide (rGO) as possible electrode materials for supercapacitors. Cobalt oxide (Co₃O₄) nanocubes intercalated reduced graphene oxides (rGO) were synthesized via a facile hydrothermal method. It has been found that the Co₃O₄ particles with a cubical shape are decorated on rGO matrix with an average size of ∼45 nm. The structural crystallinity of rGO–Co₃O₄ composites was examined by X-ray diffraction (XRD). Raman spectroscopy confirmed the successful reduction of GO to rGO and effective interaction between Co₃O₄ and the rGO matrix. The electrochemical performances of rGO–Co₃O₄ electrodes were examined using cyclic voltammetry and charge–discharge techniques. The maximum specific capacitance (278 F g⁻¹) is observed at current density of 200 mA g⁻¹ in the C2 electrode resulting from effective ion transfer and less particle aggregation of Co₃O₄ on the rGO matrix than in the other electrodes. C2 exhibits good rate capability and excellent long-term cyclic stability of 91.6% for 2000 cycles. The enhanced electrochemical performance may result from uniform intercalation of cobalt oxide over the rGO. These results suggest that the Co₃O₄ intercalated rGO matrix could play a role in improved energy storage capability.
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