Synergistic integration of Bi2O3||CoWO4 for asymmetric supercapattery: A binder-free approach ensuring high endurance cycling stability

Supercapatteries are becoming increasingly popular as energy storage devices due to their remarkable electrochemical characteristics, which combine a high energy storage capacity, similar to batteries, and a high-power output, similar to supercapacitors. In this study, the assembly of Bi2O3/Carbon cloth (anode) and CoWO4/Nickel foam (cathode) electrodes was carried out using a PVA-KOH gel electrolyte. The device operated within a potential range of 1.55 V and exhibited a specific capacity of 423 C/g at a 1 A/g current density. Additionally, the prepared solid-state device showed remarkable electrochemical stability, retaining over 96 % coulombic efficiency and 90 % capacity after 10,000 GCD cycles. Furthermore, the fabricated asymmetric supercapattery demonstrated an energy density of 115.11 Wh/kg and a specific power density of 6005 W/kg. The ability of the fabricated adaptable supercapacitor to power an LED highlights its potential in flexible applications without compromising functionality. This presents a promising outlook for the advancement of electrochemical energy storage devices.