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タイトル: Impact of Interfacial Proton Accumulation on Protonation in a Brownmillerite Oxide
著者: Xie, Lingling
Isoda, Yosuke
Nakamizo, Shuri
Majima, Takuya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1019-2512 (unconfirmed)
Hosokawa, Saburo
Nitta, Kiyofumi
Shimakawa, Yuichi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1019-2512 (unconfirmed)
Kan, Daisuke  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7505-0059 (unconfirmed)
著者名の別形: 謝, 玲玲
磯田, 洋介
中溝, 珠里
間嶋, 拓也
細川, 三郎
島川, 祐一
菅, 大介
キーワード: brownmillerite oxide
interfacial proton accumulation
protonation, SrCoO[2.5] epitaxial films
発行日: 16-Dec-2024
出版者: Wiley
誌名: Advanced Functional Materials
巻: 34
号: 51
論文番号: 2410084
抄録: Electrochemical protonation provides ways to control physical properties and even explore unprecedented phases of solid-state materials. While how proton accumulation changes materials' properties is investigated, how protonation of solids can be controlled and promoted remains an enigmatic puzzle. In the work reported here, the influence of electrochemical proton injection duration (t[Vg]) is investigated on the protonation of SrCoO[2.5] (SCO) films in electric-field-effect transistor structures with gate layers of the proton-conducting electrolyte Nafion. The proton concentration accumulated in SCO films varies depending on the duration of the proton injection. When protons are injected in a relatively short t[Vg] (≤ 600 s), the hydrogen concentration accumulated in SCO film increases with increasing t[Vg], reaching the maximum proton concentration of ≈1.9 per formula unit of SCO for the t[Vg] = 600 s case. On the other hand, when t[Vg] is longer than 900 s, the proton concentration decreases with t[Vg], implying the occurrence of counterreactions that extract protons from protonated SCO and oxidize the channel. These observations indicate that protons accumulated at the Nafion/SCO interface play a role in the protonation of SCO films and that suppressing the interfacial proton accumulation is the key to maximizing the proton concentration accumulated in SCO films.
著作権等: © 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
URI: http://hdl.handle.net/2433/290626
DOI(出版社版): 10.1002/adfm.202410084
出現コレクション:学術雑誌掲載論文等

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