. The specific capacitance for an electrode within the stacks varies insignificantly from 67.7 to 74.2 F/g. The minor deviations may be explained by small differences between the electrodes as a result of small experimental errors during electrode preparation. The capacitance for each electrode pair in these stacks was also very similar, suggesting the equal capacitive contribution from each pair of electrodes. This is further corroborated by the uniform voltage distribution among the electrode pairs in the stacks (see Supporting Information section S4 for details). When applying voltages of 2, 4, 8 and 12 V to stacks with 2, 4, 8 and 12 electrode pairs, respectively, the potential drops across each electrode pair varied only slightly within the range of 0.9 V to 1.1 V (Figure ) for all stacks, signifying an almost equal behavior. The stacks were further analyzed by EIS at 0 V between 1 mHz and 100 kHz, and Figure presents the typical Nyquist Plot results. Calculated capacitance and resistance results from EIS tests are all tabulated in Table . The equivalent series resistance (ESR) increased from 0.40, 0.55, 1.28 to 1.70 Ω with increasing number of electrode pairs (2, 4, 8 and 12) in the stack. The increase is expected because the electrode pairs are connected in series. At low frequencies, the plots show slightly tilted, near vertical straight lines documenting the capacitive behavior of stacks. The stack capacitance was calculated from the EIS plot using