Fig. 5From: Functionalization of Petroleum Coke-Derived Carbon for Synergistically Enhanced Capacitive Performance a Galvanostatic charge-discharge curves of PCAC, PCHO, and PCNC at a current density of 5 A · g−1 in 30 wt% KOH. b Variation in the specific capacitance of PCAC, PCHO, and PCNC as a function of current density. c Nyquist plots. d Ragone plots of the PCAC, PCHO, and PCNCBack to article page