Effect of CO2 absorption on ion and water mobility in an anion exchange membrane

We report the measured water uptake, density, ionic conductivity and water transport properties in Tokuyama A201 membrane in OH−, HCO3− and Cl− forms. The water uptake of the AEM varies with anion type in the order λ(OH−) > λ(HCO3−) > λ(Cl−) for samples equilibrated with the same water vapor a...

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Bibliographic Details
Published in:	Journal of power sources 2018-03, Vol.380, p.64-75
Main Authors:	Peng, Jing, Roy, Asa L., Greenbaum, Steve G., Zawodzinski, Thomas A.
Format:	Article
Language:	eng
Subjects:	Anion exchange membrane Carbon dioxide adsorption Fuel cell Ion mobility Nernst-Einstein equation Water transport
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Summary:	We report the measured water uptake, density, ionic conductivity and water transport properties in Tokuyama A201 membrane in OH−, HCO3− and Cl− forms. The water uptake of the AEM varies with anion type in the order λ(OH−) > λ(HCO3−) > λ(Cl−) for samples equilibrated with the same water vapor activity (aw). The conductivity of the AEM is reduced by absorption of CO2. Pulsed-field gradient nuclear magnetic resonance (PFG-NMR) measurements were utilized to characterize the diffusivity of water and HCO3− ion. The anion diffusion coefficient and membrane conductivity are used to probe the applicability of the Nernst-Einstein equation in these AEMs. [Display omitted] •An anion exchange membrane Tokuyama A201 was studied in OH−, Cl− and HCO3− forms.•Water uptake, density, ionic conductivity and water transport of AMEs was reported.•The effect of CO2 absorption in the water uptake and conductivity of AEM was observed.•Water and HCO3− ion diffusivity was characterized by PFG-NMR technique.•The applicability of Nernst-Einstein equation in AEM was discussed.
ISSN:	0378-7753 1873-2755