尖晶石
微晶
X射线光电子能谱
无机化学
拉曼光谱
氧化物
材料科学
机械合成
化学
化学工程
球磨机
冶金
光学
物理
工程类
作者
Olena Porodko,Martin Fabián,Hristo Kolev,Maksym Lisnichuk,Markéta Zukalová,Monika Vinarčíková,Vladimír Girman,Klebson Lucenildo Da Silva,V. Šepelák
标识
DOI:10.1515/zpch-2021-3106
摘要
Abstract For the first time, a spinel-type high entropy oxide (Zn 0.25 Cu 0.25 Mg 0.25 Co 0.25 )Al 2 O 4 as well as its derivative lithiated high entropy oxyfluoride Li 0.5 (Zn 0.25 Cu 0.25 Mg 0.25 Co 0.25 ) 0.5 Al 2 O 3.5 F 0.5 and oxychloride Li 0.5 (Zn 0.25 Cu 0.25 Mg 0.25 Co 0.25 ) 0.5 Al 2 O 3.5 Cl 0.5 are prepared in the nanostructured state via high-energy co-milling of the simple oxide precursors and the halides (LiF or LiCl) as sources of lithium, fluorine and chlorine. Their nanostructure is investigated by XRD, HR-TEM, EDX and XPS spectroscopy. It is revealed that incorporation of lithium into the structure of spinel oxide together with the anionic substitution has significant effect on its short-range order, size and morphology of crystallites as well as on its oxidation/reduction processes. The charge capacity of the as-prepared nanomaterials tested by cyclic voltammetry is found to be rather poor despite lithiation of the samples in comparison to previously reported spinel-type high entropy oxides. Nevertheless, the present work offers the alternative one-step mechanochemical route to novel classes of high entropy oxides as well as to lithiated oxyfluorides and oxychlorides with the possibility to vary their cationic and anionic elemental composition.
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