부산대학교 도서관

Carbon dioxide capture technologies will be important for counteracting difficult-to-abate greenhouse gas emissions if humanity is to limit global warming to acceptable levels. Electrochemically mediated CO2 capture has emerged as a promising alternative to conventional amine scrubbing, offering a potentially cost effective, environmentally friendly and energy efficient approach. Here we report an electrochemical cell for CO2 capture based on pH swing cycles driven through proton-coupled electron transfer of a developed phenazine derivative, 2,2′-(phenazine-1,8-diyl)bis(ethane-1-sulfonate) (1,8-ESP), with high aqueous solubility (>1.35 M) over pH range 0.00–14.90. The system operates with a high capture capacity of 0.86–1.41 mol l−1, a low energetic cost of 36–55 kJ mol−1 and an extremely low capacity fade rate of <0.01% per day, depending on organic concentration. The system charge–discharge cycle provides an electrical energy storage function that could be run only for storage when called for by electricity market conditions.
Electrochemical carbon capture is a promising way to electrify CO2 emissions mitigation, but capacities are often low due to poor solubility of the redox-active organic molecules at the heart of the process. Here the authors report a high-capacity and high-stability electrochemical CO2 capture system based on a phenazine derivative they have developed.