The voltage distribution between the electrode pairs was checked by connecting a multimeter (AstroAI, DM6000AR) to the titanium strips and plates. Cyclic voltammetry (CV), galvanic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) were performed using a Gamry reference 3000 potentiostat. Gas separation experiments were carried out in continuous flow mode with the gas mixture flowing continuously through the module. A flow scheme for the SSA module in operation is shown in the Supporting Information section S1, Figure . The adsorption and desorption of CO2 was detected by a Quantek CO2 analyzer measuring the CO2 concentration changes during the charge-discharge process. Before the start of the chargedischarge cycles, the SSA module was flushed with the 15% CO2/85% N2 gas mixture for a several hours to ensure conventional sorption of CO2 to the electrodes and electrolyte was complete. The SSA module was charged and discharged using the "GCD+Pstat" method, comprising galvanostatic charge and discharge (GCD) at a constant current of 50 mA between 0 and 1V with 10 min potentiostatic (Pstat) holding steps at 0 V (after discharge) and 1V (after charge). Gas flow rates were adjusted with the electrode pair number in the stacks to obtain the full adsorption of CO2 within same time range, and were 6 cc/min for 2 pairs, 16 cc/min for 4 pairs, 24 cc/m for 8 pairs and 36 cc/m for 12 pairs. Adsorptive and energetic performance metrics were calculated analogously to our previous publications and can be found in the Supporting Information section S2. Prior to the gas separation experiments, the stacks were characterized by cyclovoltammetry in order to verify their expected capacitive behavior. The CVs (Figure ) of stacks with 2, 4, 8 and 12 electrode pairs at the scan rate of 1 mV/s all show a highly rectangular shape indicative for near ideal capacitive charge storage behavior.