Matsui Hirosuke, Ishiguro Nozomu, Suzuki Youya, Wakamatsu Kouhei, Yamada Chiharu, Sato Kanako, Maejima Naoyuki, Uruga Tomoya, Tada Mizuki
Department of Chemistry, Graduate School of Science & Institute for Advanced Science & Integrated Research Consortium on Chemical Science (IRCCS) & the R-ing (Reaction Infography) World Research Unit (B-1), Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
Phys Chem Chem Phys. 2020 Dec 23;22(48):28093-28099. doi: 10.1039/d0cp04416d.
Cr-Loaded iron oxide with a dendritic crystalline structure was synthesized and the reversible crystalline phase transition during redox cycling of the iron oxide was investigated. X-ray diffraction and transmission electron microscopy analyses revealed that Cr was well dispersed and loaded in the iron oxide dendrite crystals, whose lattice constant was dependent on the Cr loading. Temperature-programmed oxidation and reduction experiments revealed the reversible redox properties of the Cr-loaded iron oxide dendrites, whose redox temperature was found to be lower than that of Cr-free iron oxide dendrites. In situ Fe K-edge and Cr K-edge X-ray absorption near-edge structure (XANES) analysis indicated that Cr loading extended the redox reaction window for conversion between Fe3O4 and γ-Fe2O3 owing to compressive lattice strain in the iron oxide spinel structures.
合成了具有树枝状晶体结构的负载铬的氧化铁，并研究了氧化铁在氧化还原循环过程中的可逆晶相转变。X射线衍射和透射电子显微镜分析表明，铬在氧化铁树枝状晶体中分散良好且负载其中，其晶格常数取决于铬的负载量。程序升温氧化和还原实验揭示了负载铬的氧化铁树枝状晶体的可逆氧化还原特性，发现其氧化还原温度低于无铬氧化铁树枝状晶体。原位Fe K边和Cr K边X射线吸收近边结构（XANES）分析表明，由于氧化铁尖晶石结构中的压缩晶格应变，铬的负载扩展了Fe3O4和γ-Fe2O3之间转化的氧化还原反应窗口。
Zotero 插件