A schematic illustration of the SSA experimental setup is shown in Figure . A 15 % CO2/85 % N2 gas mixture flows through a bubbler filled with 1 M NaHCO3. The moistened gas passes through a mass flow controller adjusted to a flow rate of 1 sccm. The gas mixture enters the SSA module from the center inlet port (1 mm in diameter) and flows radially through the gas diffusion layer inside the module. The gas exits from the outlet port at the corner of the top Ti plate, passes through a drying tube, and is then analyzed by a CO2 analyzer (Quantek Instruments, Model 9-6). The gas mixture was flown through the modules for 8 h without applying any bias to complete conventional CO2 adsorption to the electrodes and conventional CO2 absorption by the electrolyte. After that time, the concentration of the exiting gas attained a constant value of 15% showing that conventional ad/absorption was complete. The module was then charged at a rate of 50 mA/g to different voltage windows. The potential was held at the highest charging voltage for an additional time (90 minutes for GR-AC) to allow for maximum saturation of the electrode with CO2. After that, the module was discharged to 0 V at 50 mA/g followed by a holding step (60 min) to complete the desorption of CO2 gas from the electrode.