Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 468, Issue -, Pages 373-379Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.06.028
Keywords
CO2 capture; Membrane; Electrochemical; Charge-transfer; Flux density
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Funding
- NSF [CBET-1340269, CBET-124706]
- U.S. Army Research Office [W911NF-10-R-006, W911NF-13-1-0158]
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We here report a mechanistic investigation into the electrochemical transport of CO2 through a dense metal-carbonate membrane. The investigation studied a total of six possible charge-transfer mechanisms involving CO32-, O-2(2-), O2- and CO52- as the active surface species, and derived the corresponding flux equation from each mechanism. The experimental CO2 flux densities measured under a range of chemical gradients were used to verify each mechanism by plotting the flux density against the corresponding flux expression of each mechanism. The results showed that CO42- scheme is the best mechanism to describe the electrochemical CO2 transport through the metal-carbonate membranes. A new transport model was also shown to describe the CO42- migration and charge-transfer. (C) 2014 Elsevier B.V. All rights reserved.
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