The SSA adsorptive metrics include the calculation of the number of moles of CO2 adsorbed during the charging plus the holding step (na, CO2., μmol), adsorption capacity with respect to mass (AC, mmol.kg -1 ), external electrode area (AC, mmol.m 2 ), and volume (AC, mol.m 3 ) of the gas-exposed electrode, adsorption rate (AR, μmol.kg -1 .s -1 ), productivity (P, mmol.h -1 .m -2 ), charge efficiency (CE, dimensionless), energy consumption (EC, kJ.mol -1 ), and time-energy efficiency (TEE, mol.kJ -1 .s -1 ). where 𝑃 is the pressure (1 atm), 𝑇 is the temperature (296 K), 𝑅 is the general gas constant, 𝑓 𝑖 and 𝑓 𝑒 are the influent and effluent gas flow rates, 𝑚 𝑡𝑜𝑝 is the mass of top electrode, A is the area of electrodes, V is the volume of electrodes, and t is the total charging time (including the 30 min holding step).