Synthesis and characterization of individual high-entropy alloy particles for electrocatalytic water oxidation.

IF 8 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Nanoscale Horizons Pub Date : 2025-04-30 DOI:10.1039/d4nh00659c

Muhammad Rauf, Gaukhar Askarova, Tianyu Bo, Michael V Mirkin

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引用次数: 0

Abstract

High-entropy alloys (HEAs) have attracted considerable attention as promising catalysts. Despite a rapidly growing number of publications in this area, characterization of HEA electrocatalytic activity and stability remains challenging. In this paper, we report rapid and scalable microwave-shock assisted synthesis of FeCoNiCuMnCr HEA and its characterization at a single particle level. HEA particles synthesized on HOPG without additional reagents or pre-/post-treatments exhibited a significant activity toward water oxidation in 0.1 M NaOH. Individual micrometer-sized FeCoNiCuMnCr HEA particles were imaged by scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) to show the uniform distribution of all six metals, and the potential dependence of the oxygen evolution reaction (OER) at its surface was probed by scanning electrochemical microscopy (SECM). Significant variations in onset potential of OER on different HEA particles were observed; however, no obvious correlation with the particle size was found. The HEA stability was confirmed by SEM/EDS imaging of the same FeCoNiCuMnCr particle after several hours of OER experiments and also by voltammetry and XRD analysis.

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电催化水氧化用高熵合金颗粒的合成与表征。

高熵合金作为一种极具发展前景的催化剂受到了广泛的关注。尽管该领域的出版物数量迅速增加，但HEA电催化活性和稳定性的表征仍然具有挑战性。在本文中，我们报道了快速和可扩展的微波冲击辅助合成FeCoNiCuMnCr HEA及其在单粒子水平上的表征。在HOPG上合成的HEA颗粒在0.1 M NaOH条件下表现出明显的水氧化活性。利用扫描电镜/能谱仪（SEM/EDS）对单个微米大小的FeCoNiCuMnCr HEA颗粒进行了成像，显示了所有六种金属的均匀分布，并利用扫描电化学显微镜（SECM）探测了其表面析氧反应（OER）的电位依赖性。不同HEA颗粒OER的起效电位有显著差异；但与颗粒大小没有明显的相关性。经过几个小时的OER实验后，对同一FeCoNiCuMnCr颗粒进行了SEM/EDS成像以及伏安法和XRD分析，证实了HEA的稳定性。

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来源期刊

Nanoscale Horizons Materials Science-General Materials Science

CiteScore

16.30

自引率

1.00%

发文量

141

期刊介绍： Nanoscale Horizons stands out as a premier journal for publishing exceptionally high-quality and innovative nanoscience and nanotechnology. The emphasis lies on original research that introduces a new concept or a novel perspective (a conceptual advance), prioritizing this over reporting technological improvements. Nevertheless, outstanding articles showcasing truly groundbreaking developments, including record-breaking performance, may also find a place in the journal. Published work must be of substantial general interest to our broad and diverse readership across the nanoscience and nanotechnology community.