Electrochemical Investigation of Activated Carbon derived from biowastes and Metal oxides decorated with conducting Polymer composites as Advanced Energy Storage Materials for Supercapacitors

Abstract

polyalthia longifolia Seeds (PLS) derived activated carbon (AC) samples were prepared newlineat different temperature (600, 700, 800 and 900and#8451;) by the pyrolytic chemical activation route. newlineThe as-prepared PLS-ACs were characterized by spectral and analytical tools. The newlineelectrochemical characterization studies were performed by cyclic voltammetry (CV), newlinegalvanostatic charge-discharge (GCD) and Impedance spectroscopic techniques. A threeelectrode newlinesystem, consisting of the as-prepared PLS-AC samples coated nickel foil (working newlineelectrode), Ag/AgCl (reference electrode) and Pt-wire (counter electrode) in 1 M sodium sulfate newline(Na2SO4) was constructed. The pronounced specific capacitance (Csp) value of 365 Fg-1 was newlineachieved at current density of 1 Ag-1 with reference to PLS-AC sample pyrolyzed at 900°C with newline92% retention even after 5000 charge/discharge cycles, substantiating the significant recycling newlinedurability. Furthermore, the prominent electrochemical behaviour under the selected potential newlinewindow was supportive of its capacitive nature. The low-cost high performance carbon material, newlineprepared from the bio-waste, exhibited enhanced Supercapacitance, suitable for power storage newlinedevices. Moreover, the fabricated symmetric device using PLS-9 showed the high energy density newlineof 27.5 Whkgand#8722;1 at the power density of 499 Wkgand#8722;1. Thus, the highly porous PLS-9 electrode was newlinenoted to be a promising candidate for high-performance supercapacitors. newline