Abstract
Nickel foam-graphene (NF-G) was synthesized by chemical vapour deposition followed by facial in situ aqueous chemical growth of simonkolleite (Zn5(OH)8Cl2·H2O) under hydrothermal conditions to form NF-G/simonkolleite composite. X-ray diffraction and Raman spectroscopy show the presence of simonkolleite on the NF-G, while scanning and transmission electron microscopies show simonkolleite micro-plates like structure evenly distributed on the NF-G. Electrochemical measurements of the composite electrode give a specific capacitance of 350 Fg−1 at current density of 0.7 Ag−1 for our device measured in three-electrode configuration. The composite also shows a rate capability of ~87 % capacitance retention at a high current density of 5 Ag−1, which makes it a promising candidate as an electrode material for supercapacitor applications.
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This work was financially supported by the Vice-Chancellor of the University of Pretoria and the National Research Foundation (NRF) of South Africa.
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Khamlich, S., Bello, A., Fabiane, M. et al. Hydrothermal synthesis of simonkolleite microplatelets on nickel foam-graphene for electrochemical supercapacitors. J Solid State Electrochem 17, 2879–2886 (2013). https://doi.org/10.1007/s10008-013-2206-0
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DOI: https://doi.org/10.1007/s10008-013-2206-0