Issue 11, 2022

Bottom-up synthesis of 2D layered high-entropy transition metal hydroxides

Abstract

Low-dimensional high-entropy materials, such as nanoparticles and two-dimensional (2D) layers, have great potential for catalysis and energy applications. However, it is still challenging to synthesize 2D layered high-entropy materials through a bottom-up soft chemistry method, due to the difficulty of mixing and assembling multiple elements in 2D layers. Here, we report a simple polyol process for the synthesis of a series of 2D layered high-entropy transition metal (Co, Cr, Fe, Mn, Ni, and Zn) hydroxides (HEHs), involving the hydrolysis and inorganic polymerization of metal-containing species in ethylene glycol media. The as-synthesized HEHs demonstrate 2D layered structures with interlayer distances ranging from 0.860 to 0.987 nm and homogeneous elemental distribution of designed equimolar stoichiometry in the layers. These 2D HEHs exhibit a low overpotential of 275 mV at 10 mA cm−2 in a 0.1 M KOH electrolyte for the oxygen evolution reaction. Superparamagnetic spinel-type high-entropy nanoparticles can also be obtained by annealing these HEHs. Our polyol approach creates opportunities for synthesizing low-dimensional high-entropy materials with promising properties and applications.

Graphical abstract: Bottom-up synthesis of 2D layered high-entropy transition metal hydroxides

Supplementary files

Article information

Article type
Paper
Submitted
17 des. 2021
Accepted
20 apr. 2022
First published
21 apr. 2022
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2022,4, 2468-2478

Bottom-up synthesis of 2D layered high-entropy transition metal hydroxides

F. Li, S. Sun, Y. Chen, T. Naka, T. Hashishin, J. Maruyama and H. Abe, Nanoscale Adv., 2022, 4, 2468 DOI: 10.1039/D1NA00871D

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