To evaluate and compare the electrochemical properties of fct-EEM/fct-EEG and EEM/EEG composites, electrochemical tests including CV, GCD and EIS were carried out. A plot of the specific capacitances for both fct-EEM/fct-EEG and EEM/EEG composites as a function of varying current densities are shown in Figure . It can be seen that within error, the specific capacitances of both samples are the same. There is no obvious increase in the capacitance after functionalization. However, it is noticeable that the fct-EEM/fct-EEG is more reproducible in terms of specific capacitance (smaller error bars compared to that of EEM/EEG). A plausible explanation is that given enough time for functionalization, the surfaces of fct-EEM and fct-EEG are saturated with functional groups and thus each flake of EEM or EEG is uniform. CV and GCD measurements for fct-EEM/fct-EEG composites of other gravimetric ratios (3:1) were also perfumed (Figure ), which show inferior electrochemical properties because of decreased electric conductivity.