Although there have been several attempts to model the mass transport of solution species to the catalyst surface in CO 2 ER, a vast majority of the existing literature is restricted to reactiondiffusion type models introduced by N. Gupta and co-authors and ignore the formation of the electrical double layer (EDL) and therefore any migration of charged species in front of the catalyst surface . The presence of the electrified interface has been used however, to explain the influence of cations on experimentally observed performance . Considering the significant applied voltage under which CO 2 ER operates, the local environment for the catalysis is insufficiently defined without the inclusion of the electrostatic interactions of the ionic species with the charged metallic surface. These interactions, and the resulting double layer structure, can extend up to several nanometers from the catalyst surface (see Figure ) and are necessary to consider in order to derive physically consistent hypotheses based on experimental observations.