Multi-Tubular Electrochemical Cell for Carbon Dioxide Separations

Systems and methods for electrochemical target species separation are described herein. In some embodiments, a target species can be transported, in response to an applied voltage, from a fluid in a first electrically conductive tube (e.g., a tubular electrode) that has a low concentration of the target species to a fluid in a second electrically conductive tube (e.g., a tubular electrode) that has a high concentration of the target species. The transport of the target species may involve the diffusion of the target species through porous walls of the first and second tube. In some embodiments, the target species comprises gases such as acid gases (some of which may be commonly exhausted from powerplants and/or industrial processes).