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Nanometer-Scale Water Dynamics in Nafion Polymer Electrolyte Membranes: Influence of Molecular Hydrophobicity and Water Content Revisited

Title
Nanometer-Scale Water Dynamics in Nafion Polymer Electrolyte Membranes: Influence of Molecular Hydrophobicity and Water Content Revisited
Authors
Saun, Seung-BoKim, JiWonHwang, Ryeo YunAhn, YeonhoKim, DukjoonPark, Daniel K.Lee, SoonchilHan, Oc Hee
Ewha Authors
한옥희
SCOPUS Author ID
한옥희scopus
Issue Date
2020
Journal Title
ACS MACRO LETTERS
ISSN
2161-1653JCR Link
Citation
ACS MACRO LETTERS vol. 9, no. 7, pp. 1013 - 1018
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
The ionic conductivity of polymer electrolyte membranes (PEMs) is an essential parameter for their device applications. In water-swollen PEMs, protons and other ions are transferred through hydrophilic channels of a few nanometers in diameter at most. Thus, optimizing the chemical and physical properties of the channels can enhance the conductivity of PEMs. However, the factors controlling the conductivity have not been completely clarified. Here, we report that measurements taken near the channel walls by a special nuclear magnetic resonance technique with <= 1 nm spatial resolution showed the largest water diffusivity when , similar to 80% of hydrophilic sulfonic acid groups were blocked, but the proton conductivity was low. The water diffusivity was much less affected by differences in water content. Our results provide a concept for changing the properties of PEMs and a challenge to implement the improved diffusivity in a way that enhances net ion conductivity.
DOI
10.1021/acsmacrolett.0c00173
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자연과학대학 > 화학·나노과학전공 > Journal papers
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