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