Abstract: The development of carbon dioxide capture and concentration technologies is vital to mitigate anthropogenic carbon dioxide emissions. Nearly all of the illustrative mitigation pathways to decarbonization depend upon CO2 capture. Current state-of-the-art technologies for carbon capture are predominantly thermal based. However, the practical applications of this technology have been limited by low overall energetic inefficiency due to Carnot limitations and thermal sorbent degradation. Electrochemical CO2 capture and concentration has been presented as an alternative technology that may address the concerns of energetic efficiency by bypassing the need for temperature swings and instead using more energetically-efficient redox swings. This defense will explore approaches to design of redox carriers capable of capturing CO2  from dilute streams.