| Summary: | The ZnO/Ni<sub>2</sub>S<sub>3</sub> composite has been designed and in situ synthesized on Ni foam substrate by two steps of electrodeposition. ZnO was achieved on Ni foam by a traditional potentiostatic deposition, followed by cyclic voltammetric (CV) electrodeposition, to generate Ni<sub>2</sub>S<sub>3</sub>, where the introduction of ZnO provides abundant active sites for the subsequent Ni<sub>2</sub>S<sub>3</sub> electrodeposition. The amount of deposit during CV electrodeposition can be adjusted by setting the number of sweep segment and scan rate, and the electrochemical characteristics of the products can be readily optimized. The synergistic effect between the ZnO as backbones and the deposited Ni<sub>2</sub>S<sub>3</sub> as the shell enhances the electrochemical properties of the sample significantly, including a highly specific capacitance of 2.19 F cm<sup>−2</sup> at 2 mA cm<sup>−2</sup>, good coulombic efficiency of 98%, and long-term cyclic stability at 82.35% (4000 cycles).
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