Research Article


2022, 15(3): 2756−2763


Deep eutectic solvent assisted facile synthesis of low-dimensional hierarchical porous high-entropy oxides

Jiale Wei1,2, Kai Rong1,2, Xiaolong Li1,2, Yuchen Wang1,2, Zhen-An Qiao3, Youxing Fang1 (✉), and Shaojun Dong1,2 (✉)

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1 State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2 University of Science and Technology of China, Hefei 230026, China
3 State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, International Joint Research Laboratory of Nano-Micro Architecture Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China

Keywords: high-entropy oxide, deep eutectic solvent, one-/two-dimentional (1D/2D) hierarchical structure, lithium-ion battery
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  • Abstract
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High-entropy-oxides (HEOs), a new class of solids that contain five or more elemental species, have attracted increasing interests owing to their unique structures and fascinating physicochemical properties. However, it is a huge challenge to construct various nanostructured, especially low-dimensional nanostructured HEOs under the high temperature synthetic conditions. Herein, a facile strategy using glucose-urea deep eutectic solvent (DES) as both a solvent and the carbon source of structure-directed template is proposed for the synthesis of various HEOs with two-dimentional (2D) nanonets and onedimentional (1D) nanowires, including rock-salt (Co, Cu, Mg, Ni, Zn)O, spinel (Co, Cr, Fe, Mn, Ni)3O4, and perovskite La(Co, Cr, Fe, Mn, Ni)O3. The as-prepared HEOs possessed five or more uniformly dispersed metal elements, large specific surface areas (more than 25 m2·g−1), and a pure single-phase structure. In addition, high cooling rate (cooling in air or liq-N2-quenching) was indispensable to obtain a single-phase rock-salt (Co, Cu, Mg, Ni, Zn)O because of phase separation caused by copper. By taking advantage of unique features of HEOs, rock-salt (Co, Cu, Mg, Ni, Zn)O can function as a promising candidate for lithium-ion batteries (LIBs) anode material, which achieved excellent cycling stability. This work provides a feasible synthetic strategy for lowdimensional hierarchical HEOs, which creates new opportunities for the stable HEOs being highly active functional materials.
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Deep eutectic solvent assisted facile synthesis of low-dimensional hierarchical porous high-entropy oxides. Nano Res. 2022, 15(3): 2756−2763

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