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Capture and conversion of CO 2  from oceanwater can lead to net-negative emissions and can provide carbon source for synthetic fuels and chemical feedstocks at the gigaton per year scale. Here, we report a direct coupled, proof-of-concept electrochemical system that uses a bipolar membrane electrodialysis (BPMED) cell and a vapor-fed CO 2  reduction (CO 2 R) cell to capture and convert CO 2  from oceanwater. The BPMED cell replaces the commonly used water-splitting reaction with one-electron, reversible redox couples at the electrodes and demonstrates the ability to capture CO 2  at an electrochemical energy consumption of 155.4 kJ mol −1  or 0.98 kWh kg −1  of CO 2  and a CO 2  capture efficiency of 71%. The direct coupled, vapor-fed CO 2 R cell yields a total Faradaic efficiency of up to 95% for electrochemical CO 2  reduction to CO. The proof-of-concept system provides a unique technological pathway for CO 2  capture and conversion from oceanwater with only electrochemical processes.

A direct coupled electrochemical system for capture and conversion of CO2 from oceanwater