| Summary: | Herein, nickel–cobalt sulfide (NCS) nanoflakes covering the surface of Cu(OH)<sub>2</sub> nanorods were achieved by a facile two-step electrodeposition strategy. The effect of CH<sub>4</sub>N<sub>2</sub>S concentration on formation mechanism and electrochemical behavior is investigated and optimized. Thanks to the synergistic effect of the selected composite components, the Cu(OH)<sub>2</sub>/NCS composite electrode can deliver a high areal specific capacitance (<i>C</i>s) of 7.80 F cm<sup>−2</sup> at 2 mA cm<sup>−2</sup> and sustain 5.74 F cm<sup>−2</sup> at 40 mA cm<sup>−2</sup>. In addition, coulombic efficiency was up to 84.30% and cyclic stability remained 82.93% within 5000 cycles at 40 mA cm<sup>−2</sup>. This innovative work provides an effective strategy for the design and construction of hierarchical composite electrodes for the development of energy storage devices.
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