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タイトル: | Emergence of Dynamically-Disordered Phases During Fast Oxygen Deintercalation Reaction of Layered Perovskite |
著者: | Yamamoto, Takafumi Kawaguchi, Shogo Kosuge, Taiki Sugai, Akira Tsunoda, Naoki Kumagai, Yu Beppu, Kosuke Ohmi, Takuya Nagase, Teppei Higashi, Kotaro Kato, Kazuo Nitta, Kiyofumi Uruga, Tomoya Yamazoe, Seiji Oba, Fumiyasu Tanaka, Tsunehiro https://orcid.org/0000-0002-1371-5836 (unconfirmed) Azuma, Masaki Hosokawa, Saburo |
著者名の別形: | 山添, 誠司 田中, 庸裕 細川, 三郎 |
キーワード: | oxygen storage material perovskite oxide synchrotron X-ray technique time-resolved measurement topochemical reaction |
発行日: | 6-Jul-2023 |
出版者: | Wiley |
誌名: | Advanced Science |
巻: | 10 |
号: | 19 |
論文番号: | 2301876 |
抄録: | Determination of a reaction pathway is an important issue for the optimization of reactions. However, reactions in solid-state compounds have remained poorly understood because of their complexity and technical limitations. Here, using state-of-the-art high-speed time-resolved synchrotron X-ray techniques, the topochemical solid-gas reduction mechanisms in layered perovskite Sr3Fe2O7−δ (from δ ∼ 0.4 to δ = 1.0), which is promising for an environmental catalyst material is revealed. Pristine Sr3Fe2O7−δ shows a gradual single-phase structural evolution during reduction, indicating that the reaction continuously proceeds through thermodynamically stable phases. In contrast, a nonequilibrium dynamically-disordered phase emerges a few seconds before a first-order transition during the reduction of a Pd-loaded sample. This drastic change in the reaction pathway can be explained by a change in the rate-determining step. The synchrotron X-ray technique can be applied to various solid-gas reactions and provides an opportunity for gaining a better understanding and optimizing reactions in solid-state compounds. |
URI: | http://hdl.handle.net/2433/286770 |
DOI(出版社版): | 10.1002/advs.202301876 |
出現コレクション: | 学術雑誌掲載論文等 |
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