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

JOURNAL OF POWER SOURCES

卷:380

Article

Peng, Jing¹  Roy, Asa L.²  Greenbaum, Steve G.³  Zawodzinski, Thomas A.^1,4 

[1] Univ Tennessee, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA

[2] Univ Tennessee, Bredesen Ctr Interdisciplinary Res & Educ, Knoxville, TN 37996 USA

[3] CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA

[4] Oak Ridge Natl Lab, Phys Chem Mat Grp, Oak Ridge, TN 37831 USA

关键词: Anion exchange membrane;    Ion mobility;    Water transport;    Carbon dioxide adsorption;    Fuel cell;    Nernst-Einstein equation;   

DOI  :  10.1016/j.jpowsour.2018.01.071

来源: Elsevier

【 摘 要 】

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 lambda(OH-) > lambda(HCO3-) > lambda(Cl-) for samples equilibrated with the same water vapor activity (a(w)). 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.

【 授权许可】

Free