Achieving Self-Supported Hierarchical Cu(OH)2/Nickel-Cobalt Sulfide Electrode for Electrochemical Energy Storage

Herein, nickel-cobalt sulfide (NCS) nanoflakes covering the surface of Cu(OH)(2) nanorods were achieved by a facile two-step electrodeposition strategy. The effect of CH4N2S concentration on formation mechanism and electrochemical behavior is investigated and optimized. Thanks to the synergistic effect of the selected composite components, the Cu(OH)(2)/NCS composite electrode can deliver a high areal specific capacitance (Cs) of 7.80 F cm(-2) at 2 mA cm(-2) and sustain 5.74 F cm(-2) at 40 mA cm(-2). In addition, coulombic efficiency was up to 84.30% and cyclic stability remained 82.93% within 5000 cycles at 40 mA cm(-2). This innovative work provides an effective strategy for the design and construction of hierarchical composite electrodes for the development of energy storage devices.