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Wang J.,Harbin Engineering University | Wang J.,Key Laboratory of Superlight Material and Surface Technology | Wang J.,Harbin Institute of Technology | Song Y.,Harbin Engineering University | And 6 more authors.
Energy and Fuels | Year: 2010

Electrodes of Ni/Al layered double hydroxide (Ni/Al LDH) coated on the surface of nickel foam are successfully prepared by an in situ method using a mixed aqueous solution of nickel nitrate and aluminum. Their structure and surface morphology are studied by X-ray diffraction and scanning electron microscopy analysis. Their supercapacitance performances are investigated by cyclic voltammetry and constant current charge/discharge measurements. Results show that Ni/Al LDH nanoplatelets densely cover the nickel foam substrate. The electrode shows excellent electrochemical capacitive character and displays a specific capacitance of 701 F g-1 at a current density of 10 mA cm-2. The capacitance loss is less than 6% after 400 charge-discharge cycles. The larger contact area between the nickel foam supporter and active materials greatly enhances the use of Ni/Al LDH. © 2010 American Chemical Society.

Yang W.,Key Laboratory of Superlight Material and Surface Technology | Gao Z.,Key Laboratory of Superlight Material and Surface Technology | Wang J.,Key Laboratory of Superlight Material and Surface Technology | Wang J.,Harbin Engineering University | And 5 more authors.
ACS Applied Materials and Interfaces | Year: 2013

A Ni-Al layered double hydroxide (LDH), mutil-wall carbon nanotube (CNT), and reduced graphene oxide sheet (GNS) ternary nanocomposite electrode material has been developed by a facile one-step ethanol solvothermal method. The obtained LDH/CNT/GNS composite displayed a three-dimensional (3D) architecture with flowerlike Ni-Al LDH/CNT nanocrystallites gradually self-assembled on GNS nanosheets. GNS was used as building blocks to construct 3D nanostructure, and the LDH/CNT nanoflowers in turn separated the two-dimensional (2D) GNS sheets, which preserved the high surface area of GNSs. Furthermore, the generated porous networks with a narrow pore size distribution in the LDH/CNT/GNS composite were also demonstrated by the N2 adsorption/desorption experiment. Such morphology would be favorable to improve the mass transfer and electrochemical action of the electrode. As supercapacitor electrode material, the LDH/CNT/GNS hybrid exhibited excellent electrochemical performance, including ultrahigh specific capacitance (1562 F/g at 5 mA/cm2), excellent rate capability, and long-term cycling performance, which could be a promising energy storage/conversion material for supercapacitor application. © 2013 American Chemical Society.

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