Symmetric supercapacitor based on CMC incorporated interconnected V2O5 nanoflakes: Enriched with excellent electrochemical characteristics

Abstract

Combination of stable/conductive nanostructure and metal oxide with enhanced electrochemical features are still order of the day in energy market. The current work focuses the fabrication of novel nanostructured composite electrode utilizing potential Faradic nominee (vanadium pentoxide, V₂O₅) and high strength carbonaceous electrode (CMC, carboxymethyl cellulose) via simple and one-spot hydrothermal approach. Surprisingly, the prepared nanocomposite electrode (V₂O₅/C) resembles like interconnected structure which was evidenced by morphological studies. Electrochemical investigations portray that vanadium pentoxide/carboxymethyl cellulose nanocomposite prepared in the present work yielded better rate performance, high specific capacitance, stability than pristine electrodes. It is implicit that excellent electrochemical characteristics associated with the nanocomposite electrode are strongly attributed to the presence of transition metal oxide electrode through its layered structure & multiple redox states. Especially, excellent cyclic stability V₂O₅/C electrode would correspond to CMC through its facile mechanical strength. It was further satisfied by making two terminal device using V₂O₅/C electrode (both positive and negative electrode as well), 6 M KOH electrolyte and polypropylene sheet (separator). The fabricated two electrode cell could capable of providing a maximum energy density of 36 W h kg^-1 with ultra-high power density of 6482 W kg^-1. The pleasant features enriched with the prepared nanocomposite electrode should hold a prominent place in energy sphere.