Abstract
Simonkolleite (Zn5(OH)8Cl2·H2O) nanoplatelets has been deposited on nickel foam–supported graphene by using an efficient microwave-assisted hydrothermal method. The three-dimensional (3D) porous microstructure of the as-fabricated nickel foam–graphene/simonkolleite (NiF–G/SimonK) composite is beneficial to electrolyte penetration and ions exchange, whereas graphene provide improved electronic conductivity. Structural and morphological characterizations confirmed the presence of highly crystalline hexagonal-shaped nanoplatelets of simonkolleite. Field emission scanning electron microscope (FE-SEM) of the NiF–G/SimonK composite revealed that the SimonK nanoplatelets were evenly distributed on the surface of NiF–G and interlaced with each other, resulting in a higher specific surface area of 35.69m2g−1 compared to SimonK deposited directly on NiF 17.2m2g−1. Electrochemical measurements demonstrated that the NiF–G/SimonK composite exhibit a high specific capacitance of 836Fg−1 at a current density of 1Ag−1, and excellent rate capability and cycling stability with capacitance retention of 92% after 5000 charge/discharge cycles.
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