Symmetrical Supercapacitor using Coconut Shell-Based Activated Carbon

Two different supercapacitor configurations were fabricated using coconut shell-based activated carbon. results for cyclic voltammetry (cv), electrochemical impedance spectroscopy (eis), and charge-discharge measurements are presented and discussed for both configurations. the results show that coconut shell-based activated carbon is viable economical alternative electrode material to expensive activated carbon (ac) and carbon nano tubes (cnt). meanwhile, the calculations from the charge-discharge characteristics show that the disk-shape supercapacitor, with 10% polyvinylidene fluoride binder (pvdf), has the highest specific capacitance (70f/g). thus, the testing shows that the flat-laminated super-capacitor with 10% binder (pvdf) has the lowest (10.1ohms). sources of high equivalent series resistance (esr) are proposed and methods of reducing it are also discussed in this paper.