CO2 capture performance of silver-carbonate membrane with electrochemically dealloyed porous silver matrix

Developing advanced cost-effective, energy-efficient and CO2-selective carbon capture technologies to curb carbon emissions and mitigate global warming effect is of paramount importance to a sustainable future. In the present study, we report on the permeation performance of a silver-carbonate dual-phase CO2 separation membrane with the porous silver matrix prepared by electrochemical dealloying method. The membrane exhibits excellent CO2/O2 flux densities of 0.6/0.37, 0.74/0.47, 0.89/0.59 and 1.02/0.75 ml/min cm2 at 600, 625, 650 and 675 °C respectively, and stability over 500 h with a very low leakage rate. A new transport mechanism involving the change of dominant reactive sites from triple phase boundaries to two-phase boundaries is also proposed to understand behaviors of the membrane exhibited during the CO2/O2 permeation process.