Synthesis of NiCo₂S₄@NiMoO₄ Nanosheets with Excellent Electrochemical Performance for Supercapacitor

Abstract

Currently, the research of energy storage devices mainly focuses on enhancing their electrochemical performance. Core-shell structured NiCo2S4@NiMoO4 is thought to be one of the most promising electrode materials for supercapacitors due to its high specific capacitance and excellent cycle performance. In this work, we report NiCo2S4@NiMoO4 nanosheets on Ni foam by a two-step fabricated method. The as-obtained product has a high capacitance of 1035 F g−1 at 1 A g−1. The as-assembled supercapacitor has a high energy density of 32.4 W h kg−1 at a power density of 3230 W kg−1 and a superior cycle performance, with 70.1% capacitance retention. The electrode materials reported here might exhibit potential applications in future energy storage devices.

Keywords

• NiCo₂S₄@NiMoO₄
• electrochemical performance
• battery-type electrode
• asymmetric supercapacitor
• cyclic stability