Synthesis of RGO–Co doped ZnO/PANI hybrid composite for supercapacitor application
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In this paper, reduced graphene oxide–cobalt doped ZnO/polyaniline (RGO–CZO/PANI) hybrid composites were synthesized through the two step approach: Cobalt doped ZnO particles on RGO sheets by a simple chemical co-precipitation method, followed by coating with PANI through in situ polymerization method. Morphological and structural properties were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Ultraviolet–Visible absorption spectra, scanning electron microscopy and transmission electron microscopy. Electrochemical performance of the RGO–CZO/PANI hybrid composites were carried out by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy in 1M H2SO4 electrolyte medium. The findings show that the charge storage of RGO–CZO/PANI hybrid composite is mainly due to the pseudocapacitance (reversible redox reaction) behavior. The highest specific capacitance of 515 F g−1 with the energy density of 370 Wh kg−1 and power density of 3.1 kW kg−1 could be achieved (For three electrode system) in the potential region between −0.2 and 1.0. Notably, in a two-electrode system, the specific capacitance, energy density and power density of the RGO–CZO/PANI symmetric supercapacitor was obtained to be 208 F g−1, 28.88 Wh kg−1 and 0.694 kW kg−1, respectively. The results manifest that the synthesized RGO–CZO/PANI hybrid composite is the promising electrode material for supercapacitor applications.
KeywordsGraphene Oxide PANI Specific Capacitance Co2O3 Electrochemical Impedance Spectroscopy
The authors would like to thank the University Grants Commission, New Delhi, India, for providing financial assistance from UGC-BSR Fellowship. The author greatly acknowledged the Department of Physics, Alagappa University, Karaikudi for providing XRD (DST-FIST) facilities and Department of Industrial Chemistry, Alagappa University, Karaikudi for providing HR-SEM analysis. I gratefully acknowledge V.Maruthapandian and S.Sathyamoorthi, Research scholars, Central Electrochemical Research Institute, Karaikidi, India for their valuable suggestions during this part of my research work.
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