Cu
2
O/CuO nanosheets
in-situ
grown on Cu-Carbon cloths (Cu-CCs), namely Cu
2
O/CuO@Cu-CCs, are constructed by a simple strategy with electroless copper plating, chemical etching, and thermal dehydration. The as-prepared material is directly used as binder-free electrodes for supercapacitors (SCs). CCs coated with Cu, as the current collector, can effectively promote the charge collection and electron transfer, while the hierarchical Cu
2
O/CuO nanosheets provide massive active sites for fast faradic reactions. The composite electrode exhibits high specific capacitance [1.71 F cm
−2
, equivalent to 835.2 F g
−1
, at the current density of 10 mA cm
−2
(3.57 A g
−1
)]. The asymmetric supercapacitor device using Cu
2
O/CuO@Cu-CCs as the positive electrode and activated carbon as the negative electrode, achieves a superior energy density up to 60.26 Wh kg
−1
at a power density of 299.73 W kg
−1
and an excellent long-term cycling stability (9.65% loss of its initial capacitance after 5,000 cycles). The excellent electrochemical performance is mainly ascribed to the unique hierarchical structure of Cu
2
O/CuO@Cu-CCs, making it attractive as a potential electrode material for high performance SCs.
Core-shell Ni(OH) 2 @CuO electrodes grown on three-dimensional copper foams were synthesized by a facile thermal oxidation and chemical bath deposition method. The electrochemical experiments present that the Ni(OH) 2 @CuO electrode delivers large areal capacitance (1.625 F cm À 2 at 3 mA cm À 2 ), excellent rate capacity (1.285 F cm À 2 at 30 mA cm À 2 ), and brilliant cycling stability (retaining 96.4 % after 5000 cycles). In addition, an asymmetric supercapacitor (ASC) device was designed taking Ni (OH) 2 @CuO electrode and active carbon (AC) as a positive and negative electrode, respectively. The ACS device exhibits a high voltage of 1.6 V and remarkable energy density up to 58.59 Wh kg À 1 at a power density of 686.45 W kg À 1 . This work may serve to develop new areas of low-cost materials for energy storage and conversion system.
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