NOVELTY - Purification of carbon dioxide from a mixture of gases comprises: (A) bubbling the gases into a solution of an electrolyte and a catalyst in an electrochemical cell, where (i) the electrochemical cell comprises an anode in a first cell compartment and a cathode in a second cell compartment, (ii) the cathode reduces the carbon dioxide into at least one compound and (iii) the anode oxidizes at least one of the compounds into the carbon dioxide; and (B) separating the carbon dioxide from the solution.    USE - The method is useful for the purification of carbon dioxide from the mixture of gases (claimed), where the mixture of gases include exhaust streams from fossil-fuel burning power plants, exhaust streams from industrial plants, geothermal or natural gas wells streams, gas streams from atmosphere and flue gases of fossil fuel.    ADVANTAGE - The method: consumes low energy (of less than 500000, preferably 200000 watt hours per ton of carbon dioxide) than conventional techniques; provides high reaction rates suitable for scalability; provides stabile long-term reduction of carbon dioxide using copper-based alloys electrodes; provides commercialization of electrochemical purification of carbon dioxide; consumes little to no water after the solution has been established in the electrochemical cell; and has improved control over the reaction process, thus enabling for commercial systems that are modular and adaptable to different situations.    DETAILED DESCRIPTION - Purification of carbon dioxide from a mixture of gases comprises either: (A) bubbling the gases into a solution of an electrolyte and a catalyst in an electrochemical cell, where (i) the electrochemical cell comprises an anode in a first cell compartment and a cathode in a second cell compartment, (ii) the cathode reduces the carbon dioxide into at least one compound and (iii) the anode oxidizes at least one of the compounds into the carbon dioxide, and (B) separating the carbon dioxide from the solution; (A1) bubbling the gases into a solution of an electrolyte in an electrochemical cell, where the electrochemical cell comprises an anode in a first cell compartment and a cathode in a second cell compartment, (B1) reducing the carbon dioxide into oxalate at the cathode, and (C1) oxidizing the oxalate into the carbon dioxide at the anode; or (A2) bubbling the gases into a solution of an electrolyte in a divided electrochemical cell, where (i) the divided electrochemical cell comprises an anode in a first cell compartment and a cathode in a second cell compartment, (ii) the cathode reduces the carbon dioxide into at least one of oxalate, organic acids or oxalate salts and (iii) the anode oxidizes at least one of oxalate, organic acids or oxalate salts into the carbon dioxide, and (B) as above per se.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a system for the purification of carbon dioxide from mixture of gases.    System (100)    Cell (102)    Liquid source (104)    Power source (106)    Gas source (108)