Electrodeposited MnS@Ni(OH)2 core-shell hybrids as an efficient electrode materials for symmetric supercapacitor applications

The usage of composites with chalcogenides and hydroxides are fascinated prodigious consideration for supercapacitor application. In this work, the layer by layer assembly of MnS@Ni(OH) 2 core-shell hybrids were prepared by facile electrodeposition method and utilized as a binder-free electrode material for symmetric supercapacitor application. Systematic analyses have been done to confirms the formation and morphological features of MnS@Ni(OH) 2 core-shell hybrids. The core-shell hybrids of MnS@Ni(OH) 2 exhibits the redox behavior and delivered a high specific capacity of 2612 F g ­1 at a current density of 1 A g ­1 with excellent cycle stability of 88% capacity retention over 5000th cycle in 3 M KOH electrolyte. The delivered specific capacity is the highest among MnS and Ni(OH) based supercapacitors and also higher than various types of other metal oxide-based supercapacitors. Moreover, a sandwich-like solid-state symmetric supercapacitor was fabricated using MnS@Ni(OH) 2 core-shell hybrid, and thus provided the specific capacity of 168.75 F g ­1 at a current density of 1 A g ­1 with the energy and power density of 60 Wh kg −1 and 800 W kg −1 , respectively. The attained results recommended that the MnS@Ni(OH) 2 core-shell hybrid has the probability to be applied as a novel, robust, and low-cost electrode material for supercapacitor energy storage devices.