Abstract
An electroless deposition process was used to synthesize the nanostructured zinc oxide (ZnO)–activated carbon (AC) as supercapacitor. The composite oxide was studied by high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction analysis (XRD). The electrochemical performance of the nanocomposite was analyzed through cyclic voltammetry (CV) and AC impedance spectroscopy (EIS) in 0.1 M Na2SO4 as electrolyte. A specific capacitance 187 F g−1 at a scan rate of 5 mV s−1 was obtained using cyclic voltammetry (CV) and a nearly rectangular shaped CV curve was observed for the composite oxide. The supercapacitor was quite stable during charge–discharge cycling and exhibited constant capacitance during the long-term cycling. It also yielded a specific capacitance 171 F g−1 at 5 mA cm−2 with a high energy density of 21.9 Wh kg−1 and 4.2 kW kg−1 of power density. Due to unique structure of prepared ZnO–AC nanocomposite, it is a promising candidate for supercapacitor.
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Acknowledgments
The authors are grateful to the Universiti Teknologi Malaysia (UTM), Research Management Centre (RMC), Ministry of Higher Education (MOHE) Grant No 4F135 and Post-Doctoral Program for financial support given to Dr. Soheila Faraji.
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Faraji, S., Ani, F.N. Electroless nano zinc oxide–activate carbon composite supercapacitor electrode. J Electroceram 36, 122–128 (2016). https://doi.org/10.1007/s10832-016-0017-2
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DOI: https://doi.org/10.1007/s10832-016-0017-2