Electrochemically driven capacitive CO₂ capture technologies

Owing to the significant outcomes of the climate change, which is caused by the rise of atmospheric CO₂ concentration, there are large demands for the development of promising carbon capture technologies. Regarding the increased share of renewable energies and on-going efforts on the electrification of industrial processes, carbon capture driven by electrochemical voltage swing has received attention. The electrochemical CO₂ capture has unique advantages such as the ambient operation temperature, however, further improvements are necessary for practical application of this process. Herein, capacitive CO₂ capture technologies are thoroughly reviewed. Recent progresses in the two typical methods, membrane capacitive deionization (MCDI) and supercapacitive swing adsorption (SSA) are covered, followed by critical discussions on their reaction mechanisms and origin of the different characteristics. Moreover, based on the key components of the MCDI (ion exchange membranes) and SSA (supporting electrolyte) systems, the parameters affecting the CO₂-capture performances and the design strategies are investigated.