Issue 14, 2024

Porous high-entropy oxide nanosheets as highly-efficient electrocatalysts for water oxidation

Abstract

The controllable regulating strategy of composition and morphology for transition-metal-based high-entropy oxides is of significance for oxygen evolution reaction (OER), but there are still major challenges. Herein, a universal and scalable precursor morphology-oriented strategy is developed to realize the rational synthesis of high-entropy oxides with uniform component distribution. The advantages of those materials with porous nanosheet morphology and high-entropy composition endow their high-efficient catalytic performance for OER. Remarkably, the optimized (FeCoNiCrZn)3O4 catalyst shows the best catalytic activity with a small overpotential (216 mV@10 mA cm−2), low Tafel slope, excellent stability and high Faradaic efficiency of over 95% for O2 gas. The experimental studies confirm the improved catalytic active area, reaction kinetics and interfacial behaviors of (FeCoNiCrZn)3O4. In situ spectral characterizations reveal its rapid formation of OOH* species and high-valence Ni-based active species for OER, indicating the significant promotion effect of Zn element for excellent catalytic performance. Our strategy offers a novel avenue for developing other advanced high-entropy oxides for energy-related catalytic systems.

Graphical abstract: Porous high-entropy oxide nanosheets as highly-efficient electrocatalysts for water oxidation

Supplementary files

Article information

Article type
Research Article
Submitted
22 Apr 2024
Accepted
06 Jun 2024
First published
07 Jun 2024

Inorg. Chem. Front., 2024,11, 4179-4186

Porous high-entropy oxide nanosheets as highly-efficient electrocatalysts for water oxidation

T. Huang, C. Gao, Y. Tong and X. Lu, Inorg. Chem. Front., 2024, 11, 4179 DOI: 10.1039/D4QI01005A

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