Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 523, Issue -, Pages 439-445Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2016.10.025
Keywords
Carbon capture; Membrane; Metal; Carbonate; Electrochemical
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Funding
- NSF [CBET-1340269, CBET-1401280]
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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/O-2 flux densities of 0.6/0.37, 0.74/0.47, 0.89/0.59 and 1.02/0.75 ml/min cm(2) at 600, 625, 650 and 675 degrees 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/O-2 permeation process.
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