Supercapacitive swing adsorption (SSA) is a promising example of electrochemical carbon capture. Here, a potential difference is applied between two porous carbon electrodes in an aqueous electrolyte. As the charge of the electrodes is changed, the supercapacitor reversibly captures or releases CO2. The system is usually made up of two symmetric conductive carbon electrodes, a separator, and an aqueous electrolyte, typically with 1 M NaCl(aq) as the supporting electrolyte. The main limitation of this approach is the roughly eight-fold decrease in adsorption capacity (~100 mmol kg -1 normalised to the mass of the gas exposed electrode) as compared to traditional amine technology. To increase the adsorption capacity of the system several parameters have been investigated including electrolyte concentration, electrolyte composition, the structure of the carbon electrodes, the voltage window applied, the charging protocols and the polarity of the supercapacitor with respect to the gas reservoir. While larger adsorption capacities have now been reported, these come at the expense of lower coulombic and energy efficiencies showing further investigation is still required. One area of SSA that has not been investigated in detail is the mechanism of CO2 capture.