Koh-Bell et al. (2026): Bismuth-Driven Flow-Through pH Swing Architecture for Membrane-Free Electrochemical Marine Carbon Removal

Alexander Koh-Bell, Simon Rufer, Fabian J. Dickhardt, David J. Kim, Nikolaos Tsakiris, Michael P. Nitzsche, T. Alan Hatton, Kripa K. Varanasi, IN: ACS Electrochemistry, https://doi.org/10.1021/acselectrochem.6c00128

Marine carbon dioxide removal (CDR) through electrochemical pH swings offers an energy-efficient pathway for scalable CO₂ removal, utilizing the natural properties of seawater as a major carbon sink and conductive electrolyte. However, the implementation of such technologies has largely been limited by costly selective membrane materials. The recently established membrane-free pH swing via bismuth−bismuth oxychloride electrodes presents a promising energy-efficient approach, although demonstration has been thus far limited by modest reaction rates. Here, the authors advance this approach to industrially relevant current densities by developing a flow-through pH swing cell designed for elevated reaction rates.

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