1.6 V Flexible Supercapacitor Enabled by rGO-Iron Vanadium Oxide (FeVO₃) as an Anode and mw-CNT-Nickel Copper Oxide (Ni₄CuO₅) as a Cathode with High-Performance Energy Storage

The impediments confronted by flexible batteries forfabricationmethodologies and lower specific power for real-time applicationsameliorate the stand of flexible supercapacitors as a novel impartialexecutor in the storage of energy. The commendable attributes of specificenergy, long-cycle stability, and rapid ion transport make supercapacitorsa crucial candidate in the devices of storage of energy. Eying onthese recompenses of supercapacitors, Ni4CuO5-mw-CNT and rGO-FeVO3 are fabricated for higher energyasymmetric solid-state supercapacitors through a facile solvothermalprocedure delineated. The typical morphology of bimetallic oxideswith crystallinity variation depicts a high surface area that grosslysupersedes the sites of redox-active, which influences the diffusionof electrolyte ions and the variable-valence redox reaction with ionembolism. The synthesized oxide is investigated using X-ray diffraction,X-ray photoelectron, and Raman spectroscopy to affirm the phase andinspected by electron microscopy for structural features with BET.The Hirshfeld surface simulation analysis assists in grasping theelectronic interaction to explicate the experimental consequences.An asymmetric supercapacitor (ASC) device comprising Ni4CuO5-mw-CNT as a cathode and rGO-FeVO3 as ananode is assembled. The electrochemical response of Ni4CuO5-mw-CNT and rGO-FeVO3 electrodes exhibitshigher specific capacitances of similar to 778.8 and similar to 478 F/gat a current density of 0.4 A/g, respectively, superior long-cyclestabilities, and rate capabilities. Moreover, the convened ASC deviceachieves a maximum specific energy of similar to 29.2 Wh/kg and a specificpower density of similar to 3201.6 W/kg, along with a retention of thecapacitance of similar to 82.6% after 10,000 cycles. The associated porousmorphology network affords instantaneous accessibility of the electrolyticions that utterly revamp the proficiency of the electrodes in thefield of energy storage.