High Specific Energy Supercapacitor Electrode Prepared from MnS/Ni3S2 Composite Grown on Nickel Foam.

Abstract

Herein, MnS prepared in situ with Ni3S2 directly on nickel foam to obtain a novel binder-free high conductive electrode with superb echinocactus-like morphology. The novel electrode gives ultra-high results when examined as an electrode for supercapacitor application. Such as an areal capacity of 796.7 mAh cm-2 equivalent to an areal capacitance of 2390 F cm-2 at the current density of 3 mA cm-2, in addition to law resistance and remarkable potential window. Furthermore, a hybrid device using this electrode as a positive electrode and commercial activated carbon as a negative electrode was fabricated to examine practical aspects of the novel electrode, which conducted specific energy of 77.5 Wh kg-1 at a specific power of 18000 W kg-1. Interestingly, it preserved specific energy of 33.3 Wh kg-1 at a specific power of 50000 W kg-1 and satisfied capacity retention of 80 % after 2000 cycles with a coulombic efficiency reached 99%. These results confirm the electrode's superior electrochemical performance as a promising electrode for energy storage applications.