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Freestanding two-dimensional Ni(OH) 2 thin sheets assembled by 3D nanoflake array as basic building units for supercapacitor electrode materials.
Journal of Colloid and Interface Science 2018 January 2
Freestanding two dimensional (2D) porous nanostructures have great potential in electrical energy storage. In the present work, we reported the first synthesis of two-dimensional (2D) β-Ni(OH)2 thin sheets (CQU-Chen-Ni-O-H-1) assembled by 3D nanoflake array as basic building units under acid condition by direct hydrothermal decomposition of the mixed solution of nickel nitrate (Ni(NO3 )2 ) and acetic acid (CH3 COOH, AA). The unique 3D nanoflake array assembled mesoporous 2D structures endow the thin sheets with a high specific capacitance of 1.78Fcm-2 (1747.5Fg-1 ) at the current density of 1.02mAcm-2 and good rate capability of 67.4% retain from 1.02 to 10.2mAcm-2 . The corresponding assembled asymmetric supercapacitor (ASC) achieves (CQU-Chen-Ni-O-H-1//active carbon (AC)) a high voltage of 1.8V and an energy density of 23.45Whkg-1 with a maximum power density of 9kWkg-1 , as well as cycability with 93.6% capacitance retention after 10,000 cycles. These results show the mesoporous thin sheets have great potential for SCs and other energy storage devices.
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