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Accession Number ADA581715
Title Carbonate and Bicarbonate Ion Transport in Alkaline Anion Exchange Membranes.
Publication Date Jun 2013
Media Count 9p
Personal Author A. A. Peracchio A. M. Kiss G. J. Nelson K. N. Grew T. D. Myles
Abstract Anion exchange membranes (AEMs) are being developed for potential use in fuel cell systems which include portable power applications. In a fuel cell, these membranes transport hydroxide ions from the cathode to the anode. If carbon dioxide is present, carbonate and bicarbonate ions can form, displacing the hydroxide ions. Among the challenges this presents, the carbonate and bicarbonate are less mobile than the hydroxide and therefore the ionic conductivity of the membrane suffers. A procedure is outlined to take data from a permeation based water flux experiment and determine diffusion coefficients and the ionic conductivity of the membrane. The water-membrane diffusion coefficients can be measured from a water flux experiment. Using principles from kinetic theory, the water-membrane diffusion coefficient can be converted to an appropriate ion-membrane diffusion coefficient. Finally, an equation derived from the dusty fluid model can be used to calculate the ionic conductivity of the membrane in different counter ion forms. The calculated ionic conductivities have been shown to agree well with reported values for proton and anion exchange membranes.
Keywords Alkaline anion exchange membranes
Anion exchange
Fuel cell systems
Ion exchange

Source Agency Non Paid ADAS
NTIS Subject Category 99D - Basic & Synthetic Chemistry
99F - Physical & Theoretical Chemistry
97M - Batteries & Components
Corporate Author Connecticut Univ., Storrs. Dept. of Mechanical Engineering.
Document Type Journal article
Title Note Journal article.
NTIS Issue Number 1325
Contract Number W911NF-12-1-0148

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