Synthesis of porous carbon nanostructure formation from peel waste for low cost flexible electrode fabrication towards energy storage applications

Abstract

Abstract Porous activated nanostructure carbon is prepared by feasible two steps method utilizing naturally available bio-wastes such as jack fruit peel waste (JFW) and studied the effect of pyrolysis condition for porosity formation. X-ray analysis and BET pore size analysis confirmed the formation of graphitic nature carbon with micro and mesoporous existence. HR-SEM and TEM images of Jack fruit (JF) derived porous carbon samples are shown spherical nanoball and tiny nanotube morphology. High resolution SEM images further confirms that the, increase in the activation temperature increase the uniform hexagon shape porous structure formation. The superior electrochemical activity and recycling stability was achieved for our method prepared (phohphoric acid activation method using graphite crucible mold) porous carbon materials. The Cs (specific capacitance) of the JF-9 (porous carbon prepared Jack fruit at 900 °C) sample was shown 324 F/g at the scan rate of 5 mV/s using Na2SO4 electrolyte. The JF carbon sample exhibits a higher capacitance retention of 93% for upto 5000 cycles. We found that the JF derived porous carbon sample shows higher recycling capacity by Galvano static charge-discharge analysis. The effect of current density and scan rate on specific capacitance property are analyzed in detailed by cyclic-voltammetry , Galvano static charge-discharge method and electrochemical impedance spectroscopy analysis.