From amorphous to crystalline: a universal strategy for structure regulation of high-entropy transition metal oxides

Abstract

High-entropy materials (HEMs) exhibits extensive application potentials owing to the unique structural characteristics. Structure regulation is an effect strategy for materials’ performance enhancement. However, the fabrication of HEMs by integrating...

Low-temperature synthesis of high-entropy amorphous metal oxides (HEOs) for enhanced oxygen evolution performance

“…The peak position for O2 at 531.1 eV corresponds to the available –OH groups, and the peak position for O3 at 532.8 eV shows the surface adsorbed water molecules. 20,21,26,39–42 The detailed XPS study of the high-entropy HEO-110 material confirms the oxidized state of all transition metals during the hydrothermal treatment.…”

“…Lowering the diameter arc results in less charge transfer resistance, which corresponds to better electron transfer occurring at the surface of the electrode and electrolyte interface. 41,42,46,47 Herein, the HEO-110 electrode material shows a lower R ct value in comparison to other ones, implying faster charge transfer kinetics for enhanced OER activity. 14 Moreover, long-term stability performance tests (chronopotentiometry) were carried out to verify the practical usability of the OER active HEO-110 electrode material at a constant 10 mA cm −2 , as illustrated in Fig.…”

Design and Construction of Carbon‐Coated Fe3O4/Cr2O3 Heterostructures Nanoparticles as High‐Performance Anodes for Lithium Storage

“…Due to the strong chelating ability of citric acid, which is rich in ─COOH and ─OH functional groups, the metal ions are well dispersed. [ 34 ] The morphology and structure of the samples are first observed and summarized in Figure and Figure S1 (Supporting Information). Scanning electron microscopy (SEM) images show that carbon‐coated Fe 3 O 4 (FO) and FCR (Figure S1a,b, Supporting Information) consist of isotropic porous structures assembled from very fine nanoparticles.…”

High entropy materials—emerging nanomaterials for electrocatalysis

“…35 Recently, our research group proposed a universal precursor oxidation method to simultaneously achieve the synthesis and structure regulation of HEOs. 36 Different metal sources are uniformly integrated into amorphous carbon spheres through a hydrothermal process. The resulted carbon spherical precursor are transformed to crystalline HEMOs after an oxidation process and by controlling ion diffusion and oxidation rates, HEMOs with different structures including solid, core–shell and hollow spheres can be controllably achieved.…”

“…Copyright 2022, Elsevier Ltd. (e) TEM images and the corresponding element EDS mappings of the CrMnFeCoNiO. Reprinted with permission 36. Copyright 2023, The Royal Society of Chemistry.…”