This study demonstrates that a phenazine-based capture agent improves CO2 capture efficiency in gas-phase systems, highlighting significant advancements in electrochemical CO2 capture technology.
Electrochemical CO2 capture (eCC) excels in selectivity, reversibility, low-temperature operation, and reusability, yet liquid-phase systems struggle with mass transfer limitations. In this study, a phenazine-based capture agent was chemically grafted onto carboxylated carbon nanotubes, achieving an active loading of 4.4 wt %. Through stable chemical bonding and a reversible redox reaction, the immobilized phenazine efficiently captures CO2 at concentrations of ca. 0.1% in a gas-phase flow device. This system exhibits a high CO2 capture capacity of 4.8 mmol g-1, achieving nearly 100% release and capture efficiency. It offers a viable pathway for flue gas or air capture and utilization.
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Yan et al. (2025) studied this question.
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