| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2024-08-09 |
| タイトル |
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タイトル |
Microscopic Determination of the Local Hydration Number of Polymer Electrolyte Membranes Using SANS Partial Scattering Function Analysis |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Yue Zhao
Yoshimura Kimio
Sawada Shinichi
Hiroki Akihiro
Aurel Radulescu
Maekawa Yasunari
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
The conventional hydration number, ?? of a polymer electrolyte membrane (PEM) is estimated by the gravimetric measurement of the total water uptake in the membrane. This is the overall water molecules divided by the number of ionic groups, covering the water distribution from the macroscale to the molecular level. For a more precise evaluation of the local ion-water interactions and ion transport efficiency in hydrophilic channels, in contrast to ???we here propose a new index, local hydration number (?local), defined as the number of water molecules located adjacent to and interacting with ionic groups in a PEM, per ionic group in the hydrophilic channels. We introduce a new experimental method using partial scattering function analysis through contrast-variation small-angle neutron scattering technique to precisely determine ?local at the micro- (nano-) scale to the molecular level for PEMs. When applied to the benchmark material Nafion and the well-studied radiation-grafted PEM, consisting of poly(styrene sulfonic acid) grafted onto poly(ethylene-co-tetrafluoroethylene) (ETFE-g-PSSA), the obtained ?local was close to the conventional ?. This means all water molecules interacted with sulfonic acid groups, which is much different from the case of anion-type grafted PEMs. Comparing the ?local value obtained in this study with the conventional ? value confirmed that water existed only in nanostructured hydrophilic channels in these PEMs. The result of this work provides a new route to understand local molecular structures of high-performing PEMs for energy conversion applications. |
| 書誌情報 |
ACS Macro Letters
巻 12,
号 4,
p. 481-486,
発行日 2023-03
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| 出版者 |
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出版者 |
ACS Publications |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
2161-1653 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1021/acsmacrolett.3c00019 |
