Structural, Compositional, and Morphological Interrelationships in Rocksalt (FeCoMnMgZn)O High Entropy Oxide Nanocrystals for Oxygen Evolution Electrocatalysis

IF 15.6 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of the American Chemical Society Pub Date : 2025-07-04 DOI:10.1021/jacs.5c06732

Gaurav R. Dey, Simeon Teklu, Zixiao Shi, Meixue Hu, Katherine L. Thompson, Samuel S. Soliman, Robert W. Lord, Héctor D. Abruña, David A. Muller and Raymond E. Schaak*,

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Abstract

The colloidal synthesis of high entropy oxide (HEO) nanocrystals requires navigating and balancing competing reaction pathways, which are often unknown. There is also a limited understanding of HEO nanocrystal formation and growth pathways, which hinders morphological control. Here, we report on the colloidal synthesis of rocksalt-type (FeCoMnMgZn)O nanocrystals with different morphologies. Reaction pathway studies show a Fe-rich spinel-type intermediate and indicate that competing chemical reactivities dictate the final compositions and morphologies. Atomic resolution imaging analysis of concave cubic and dendritic (FeCoMnMgZn)O nanocrystals indicate a 1.73% lattice expansion relative to bulk FeO. The (FeCoMnMgZn)O nanocrystals are active electrocatalysts for the oxygen evolution reaction in alkaline media.

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用于析氧电催化的岩盐（FeCoMnMgZn）O高熵氧化物纳米晶体的结构、组成和形态相互关系。

高熵氧化物（HEO）纳米晶体的胶体合成需要导航和平衡竞争的反应途径，这些途径通常是未知的。对HEO纳米晶的形成和生长途径的了解也很有限，这阻碍了形态学控制。本文报道了不同形貌的岩盐型（FeCoMnMgZn）O纳米晶体的胶体合成。反应途径研究表明富铁尖晶石型中间体，并表明竞争的化学反应决定了最终的组成和形态。凹立方和枝晶（FeCoMnMgZn）O纳米晶的原子分辨率成像分析表明，相对于块状FeO，其晶格膨胀率为1.73%。（FeCoMnMgZn）O纳米晶体是碱性介质中析氧反应的活性电催化剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the American Chemical Society 化学-化学综合

CiteScore

24.40

自引率

6.00%

发文量

2398

审稿时长

1.6 months

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