Microwave-assisted synthesis of simonkolleite nanoplatelets on nickel foam-graphene with enhanced surface area for high-performance supercapacitors

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• 作者：S. Khamlich^a ; ^b ; ^c ; ^{skhamlich@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; T. Mokrani^d ; M.S. Dhlamini^c ; B.M. Mothudi^c ; M. Maaza^a ; ^b
• 关键词：Simonkolleite ; Graphene ; Supercapacitor ; Microwave
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：461
• 期：Complete
• 页码：154-161
• 全文大小：1798 K

文摘

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 35.69 m² g⁻¹ compared to SimonK deposited directly on NiF 17.2 m² g⁻¹. Electrochemical measurements demonstrated that the NiF–G/SimonK composite exhibit a high specific capacitance of 836 F g⁻¹ at a current density of 1 A g⁻¹, and excellent rate capability and cycling stability with capacitance retention of 92% after 5000 charge/discharge cycles.