Nanoscale CdS enwrapped zeolite-like Zn-MOF nanocomposite for advanced energy storage systems.

[Display omitted] • The polyhedral-shaped CdS decorated ZIF-8 nanocomposites have been prepared by in-situ synthesis. • It exhibits good cyclic stability, with 85.91 % (RAE) capacity retention after 6000 cycles at 5 A/g. • CdS@ZIF-8 achieves a specific capacitance of 1065 Fg−1 at 5 mV/s. With reference to the promising characteristics of metal–organic frameworks (MOFs) and the contributions of nanoparticles (NPs) to their electrochemical activities, the hybrid MOF built with metal sulphides has garnered a lot of attention, primarily as electrode materials in energy storage devices. The polyhedral-shaped CdS enwrapped zeolitic imidazolate framework-8 (ZIF-8) nanocomposites have been prepared by in-situ chemical synthesis. The electrochemical performance was evaluated in 6 M KOH electrolyte, achieving a specific capacitance of 1063.48 Fg−1 at 5 mV/s. The nanocomposite electrode material exhibits good cyclic stability, with 82.32 % (6 M KOH) and 85.91 % (redox additive electrolyte) capacity retention after 6000 cycles at 5 A/g. The energy and power density of the asymmetric supercapacitor were found to be 2.81 Wh/kg and 1785.71 W/kg, respectively. [ABSTRACT FROM AUTHOR]