To estimate the effects of functionalization on the capacitance contribution of the electrode, the Trasatti method was used to calculate the total specific capacitance (CT), electric double layer capacitance (CEDL), as well as the pseudocapacitance (CP) . The results of the estimated specific capacitances are displayed in Table and the percentages of capacitance distribution are shown in Figure . The contribution of pseudocapacitance increases from 61% to 87% because of the redox reactions after functionalization. This result agrees with the redox peak of the CV curve of fct-EEM/fct-EEG shown in Figure . It can be noticed that the estimated specific capacitances (Table ) from the Trasatti methods are much larger than the tested specific capacitances shown in Figure . This is because the specific capacitances from the Trasatti methods were calculated by fitting a straight line at a low scan rates. Theoretically, as the scan rate is close enough to 0 mV s -1 , there is enough time for the ions to diffuse into the entire electrode, which is why the specific capacitance is not limited by the diffusion rate and has a larger specific capacitance than calculated.