Rational design and controllable synthesis of nanostructured materials with unique microstructure and excellent electrochemical performance for energy storage are crucially desired. In this paper, a facile method is reported for general synthesis of hierarchically core-shell structured Ni S @NiMoO nanowires (NWs) as a binder-free electrode for asymmetric supercapacitors. Due to the intimate contact between Ni S and NiMoO , the hierarchical structured electrodes provide a promising unique structure for asymmetric supercapacitors. The as-prepared binder-free Ni S @NiMoO electrode can significantly improve the electrical conductivity between Ni S and NiMoO , and effectively avoid the aggregation of NiMoO nanosheets, which provide more active space for storing charge. The Ni S @NiMoO electrode presents a high areal capacity of 1327.3 µAh cm and 67.8% retention of its initial capacity when current density increases from 2 to 40 mA cm . In a two-electrode Ni S @NiMoO //active carbon cell, the active materials deliver a high energy density of 121.5 Wh kg at a power density of 2.285 kW kg with excellent cycling stability.

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A 3D petal-like Ni3S2/CoNi2S4 hybrid directly grown on Ni foam as a binder-free electrode is synthesized via a single step solvothermal method.