Abstract
Ni(OH)2/active carbon (AC) composites with 3D porous structure grown on Ni foam was fabricated via a facile one-pot hydrothermal process. The insight into the growth process of the Ni(OH)2/AC indicates that the AC particles are well embedded in the 3D porous structure constructed of Ni(OH)2 nanosheets. The electrochemical performance of the Ni(OH)2/AC–Ni as a binder free electrode for supercapacitors has been evaluated. It shows a high specific capacitance of 1.16 F/cm2 (1.8 times the capacitance of Ni(OH)2–Ni electrode) at a current density of 4 mA/cm2, as well as much higher capacitance retention than that of Ni(OH)2–Ni electrode over 1000 cycles. Such distinct improvement compared with the Ni(OH)2–Ni electrode can be attributed to the enhanced structure stability and electronic conductivity profiting from the AC particles embedded in the 3D porous structure of the Ni(OH)2 nanosheets.
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