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 5Ag−1,which makes it a promising candidate
as an electrode material for supercapacitor applications.