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An electrochemical quartz crystal microbalance study of a prospective alkaline anion exchange membrane material for fuel cells: Anion exchange dynamics and membrane swelling
被引：0
|作者：
机构：
[1] John, Jimmy
[2] Hugar, Kristina M.
[3] Rivera-Meléndez, Johary
[4] Kostalik, Henry A.
[5] Rus, Eric D.
[6] Wang, Hongsen
[7] Coates, Geoffrey W.
[8] Abruña, Héctor D.
来源：
Abruña, H.D. (hda1@cornell.edu)
|
1600年
/
American Chemical Society卷
/
136期
关键词：
A strategy has been devised to study the incorporation and exchange of anions in a candidate alkaline anion exchange membrane (AAEM) material for alkaline fuel cells using the electrochemical quartz crystal microbalance (EQCM) technique. It involves the electro-oxidation of methanol (CH3OH) under alkaline conditions to generate carbonate (CO32-) and formate (HCOO-) ions at the electrode of a quartz crystal resonator coated with an AAEM film;
while simultaneously monitoring changes in the frequency (Δf) and the motional resistance (ΔRm) of the resonator. A decrease in Δf;
indicating an apparent mass increase in the film;
and a decrease in ΔRm;
signifying a deswelling of the film;
were observed during methanol oxidation. A series of additional QCM experiments;
in which the effects of CH3OH;
CO32-;
and HCOO- were individually examined by changing the solution concentration of these species;
confirmed the changes to be due to the incorporation of electrogenerated CO32-/HCOO- into the film. Furthermore;
the AAEM films were found to have finite anion uptake;
validating the expected tolerance of the material to salt precipitation in the AAEM. The EQCM results obtained indicated that HCOO- and CO32-;
in particular;
interact strongly with the AAEM film and readily displace OH- from the film. Notwithstanding;
the anion exchange between CO32-/HCOO- and OH- was found to be reversible. It is also inferred that the film exhibits increased swelling in the OH- form versus the CO32-/HCOO- form. Acoustic impedance analysis of the AAEM-film coated quartz resonators immersed in water showed that the hydrated AAEM material exhibits significant viscoelastic effects due to solvent plasticization. © 2014 American Chemical Society;
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