Synthesis and Electrochemical Properties Study of Cu-Mn-S@Nf Electrode Materials

Abstract

In this study, three-dimensional interconnected nanosheet-like binder-free Cu-Mn-S@NF composites were efficiently fabricated on nickel foam by one-step electrochemical deposition and optimized for metal ion deposition concentration to improve the problem of electrochemical performance degradation due to volume expansion of supercapacitor electrode materials. Owing to the unique structure that provides many active sites and a stable skeleton structure that fully promotes the diffusion of ions from the electrolyte into the electrode material, the three-dimensional interconnected nanosheet Cu-Mn-S@NF electrode material exhibits excellent electrochemical properties, and the structure prevents agglomeration and volume expansion during charge/discharge cycles, thus alleviating active material shedding. Cu-Mn-S@NF shows superior electrochemical performance with a specific capacitance of 2614 F g-1 at a current density of 1 A g-1; the assembled Cu-Mn-S@NF//AC HSC displays outstanding energy storage capacity, with an energy density of 54.47 Wh kg-1 at a power density of 800 W kg-1, and maintains 70.23% of the initial capacitance after 6000 charge/discharge cycles.

Keywords: Supercapacitors, Electrodeposition, Binary transition metal sulfide, Nanosheets