Silcox & Chandran (2024): Demand-side flexibility enables cost savings ina reversible pH-swing electrochemical processfor oceanic CO2 removal

Rachel Silcox, Rohini Bala Chandran IN: Cell Reports Physical Science, 5, https://doi.org/10.1016/j.xcrp.2024.101884

A reversible pH-shifting seawater process uses hydrogen and redox salt to extract CO₂, generating and consuming power during acidification and basification, respectively. An equivalent circuit model predicts performance dependent on key transport and thermodynamic parameters. The need to overcome mass-transport limitations, particularly liquid boundarylayer diffusion, is crucial for industrial current densities. Energy-intensity calculations indicate this process is competitive with prior oceanic CO₂ removal processes and even with direct air capture, when pumping energy cost is eliminated.

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