▎ 摘　　要

We highlight the design and fabrication of a polydimethylsiloxane (PDMS) encapsulated advanced all solid-state asymmetric supercapacitor (ASC) device consisting of hierarchical mesoporous zinc iron cobalt ternary oxide (ZICO) nanowire coated nickel (Ni) foam (ZICO@Ni foam) as a promising positive electrode and nitrogen doped graphene coated Ni foam (N-G@Ni foam) as negative electrode in the presence of PVA-KOH gel electrolyte. Owing to outstanding electrochemical behavior and ultrahigh specific capacitance of ZICO 2587.4 F/g at 1 A/g) and N-G (550 F/g at 1 A/g) along with their mutual synergistic outputs, the assembled all solid-state ASC device exhibits an outstanding energy density of approximate to 40.5 Wh/kg accompanied by a remarkable long-term cycle stability with approximate to 9.5% specific capacitance retention even after 5000 charge discharge cycles. The exclusive hierarchical ZICO nanowires were synthesized by a facile two-step process comprising of a hydrothermal protocol followed by an annealing treatment on a quartz substrate. While Zn2+ gives the stability of the oxide system, Fe and Co ions provide better electronic conductivity and capacitive response under vigorous cyclic condition. The extraordinary performance of as-fabricated ASC device resembles its suitability for the construction of advanced energy storage devices in modern electronic industries.