biostudies-literatureZhai YNational Natural Science Foundation of ChinaNational Natural Science Foundation of China (National Science Foundation of China)10389https://www.ebi.ac.uk/biostudies/studies/S-EPMC12644598biostudies-literatureUnknown16(1)Electrochemical carbon capture offers a sustainable pathway for carbon management, yet current systems are hindered by low concentration of atmospheric carbon dioxide (CO₂), resulting in inefficiencies and limited stability. Here, we develop an electrochemical system employing a modular porous solid electrolyte (PSE) reactor for continuous, scalable carbon capture from diverse sources, including ambient air and flue gas, while regenerating high-purity CO₂ ( >99%) without additional chemical input through a recirculation mode. By leveraging oxygen evolution and reduction reactions (OER/ORR) and employing sodium (bi)carbonate as a reversible cyclic mediator, the system achieves continuous CO₂ capture from flue gas, delivering high Faradaic efficiencies for NaNature communicationsLong-term electrochemical carbon capture from diverse CO<sub>2</sub> sources with a recirculation mode.PMC1264459822205187Li WLau SPGong SGuan JZhai YLi TZhang XXia QWu ZYLeu SYfalseLong-term electrochemical carbon capture from diverse CO<sub>2</sub> sources with a recirculation mode.Electrochemical carbon capture offers a sustainable pathway for carbon management, yet current systems are hindered by low concentration of atmospheric carbon dioxide (CO₂), resulting in inefficiencies and limited stability. Here, we develop an electrochemical system employing a modular porous solid electrolyte (PSE) reactor for continuous, scalable carbon capture from diverse sources, including ambient air and flue gas, while regenerating high-purity CO₂ ( >99%) without additional chemical input through a recirculation mode. By leveraging oxygen evolution and reduction reactions (OER/ORR) and employing sodium (bi)carbonate as a reversible cyclic mediator, the system achieves continuous CO₂ capture from flue gas, delivering high Faradaic efficiencies for Na2025-01-01T00:00:00Z2025 Nov2026-06-05T19:03:47.255Z2026-05-20T03:14:51.778ZS-EPMC126445984128576010.1038/s41467-025-65332-8