ECS Transactions, 25, 839-845(2009)
Estimation of water contents of polymer electrolytes by 1H NMR spectroscopy
Atsuko Y. Nosaka and Yoshio Nosaka
(Abstract)
Water mols. confined in perfluorinated ionomer membranes which are widely used for polymer electrolyte fuel cells, presented apparently a single 1H NMR peak in hydrated states because of the rapid exchange among the water mols. at the distinct segments of the polymer. The peak shifted to the lower field with decreasing the water content due to the decrease of the fraction of the bulk water mols. which present a peak at higher field. The chem. shifts were found to be well correlated with the peak area. The water peak for MEA (Membrane Electrode Assembly) showed also similar behaviors to the membranes. From the relationship between the chem. shift and the peak area of the confined water peak we demonstrated the potential that the chem. shift could be utilized to est. the water content in the hydrated membranes and MEA.
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