This reversibility shows that when the system remains at one cell voltage for long enough, the distinction between the top and bottom electrode diminishes creating a pseudo-symmetric state as we hypothesised. This creates the conditions for the capture and release of CO2 to occur simultaneously at the two different electrodes, resulting in the establishment of thermodynamic equilibrium at longer time scales. This effect happens regardless of which direction the system is charged in. The longer voltage holds show that the capture (or release) of CO2 only occurs in a short time frame, confirming that SSA is a kinetic effect driven by the kinetic CO2 capture differences between the gas-exposed electrode and the bottom electrode. At extended times, when the system is under thermodynamic control, the net capture of CO2 becomes negligible.