Figure 7.

Electrochemical performance (cyclic voltammetry and chronopotentiometry) of activated nanoporous carbon materials (NCM) derived from chemical activation of Areca Catechu Nut (a) Comparison of CV curves for the prepared samples at 50 mV s⁻¹, (b) CV curve vs. scan rate for NCM_H₃PO₄ characteristic of EDLC behavior, (c) Corresponding CD curve vs. current densities (1− 10 A g⁻¹), (d) Calculated specific capacitances vs. scan rates for prepared samples, (e) Specific capacitances obtained from charge−discharge measurements vs. current densities, and (f) Charge−discharge cycle test at 10 A g⁻¹ NCM_ZnCl₂ and NCM_H₃PO₄. Reproduced from Reference [141]. Copyright © 2017, Springer Science Business Media.