The global warming is one of the most serious problems that the humanity facing in his history and the main cause is the high presence of CO₂ in the air due anthropogenic activities. This thesis work analyzes the CO₂ capture mechanism performed by imidazolium-based ionic liquid and it describes an electrochemical device which is able to convert the potential chemical energy released during the capture phase into electrical power. The approach used is innovative because it is not based on pH variations, redox reactions or EDL size alteration. The electrochemical cell, which is the basis of this method, is composed by two gas diffusion layers (d=16mm) and a polymeric separator impregnated with 100μl of an ionic liquid that acts and as capture media and as electrolyte.